Snapper 212CST User's Manual
Contents
1. spem 59 0018 Bui JO HONS uod 6 YOO pue uoisseJdujo2 CETTE 54015 5 S3ul4 3NIDN3 54015 pue SNNY S3Hl3 3NIDN3 NANY LON E t LUVLIS LON TUM td Sakis Snid 15 18 Jepun ou ejpi 158 PUOL OU UHM Wd 9 iSseoxe UOI 8J9 0208 UO 300d peol ou S94041S Jn0 3 ATIVOILLYYY3 SNnu SNNY HOld SNnu WOM OY uo SB Jeujojsno eui esiApv s unjes ojpeeu j0jeunqueo 1edoJdui seJnpeoojd SBM ATH00d SNnu 105 pue jan yno Ajdu3 10 yooyD uone1edo 101 29u jusJap 2949 LYVLS LON 5300 LUVLS OL 5 5 ejpeeu 42942 0 VAST suonneoeJd Ajejes pue Bues lan poo2. FILTER 5 While the muffler components are removed examine the exhaust port for carbon build up Clean the port as follows A Pull the starter rope slowly until the piston covers the port completely B Use a wooden scraper and clean in and around the port Do not use any metal or sharp edged tool that might slip and scratch the piston or rings FIGURE 28 13 C After cleaning turn the exhaust port down and blow any loose particles away with compressed air Wear eye protection during this operation See Figure 30 Muffler studs are threaded into the cylinder 2 UT OFE GASKET The muffler studs protrude by 60mm amp MUFFLER TO EXHAUST INSTALL SHUT OFF GASKET amp PLATE TO INTAKE PORT PRESSURE TESTING HOSE FIGURE 31 c While piston cylinder condition can be observed through the ports only FIGURE 30 by removing the cylinder will one get complete details on powerhead con L THE POWERHEAD dition Remove the top shroud and Piston Cylinder Crankcase remove the two cylinder screws M Torx Use Tory T A0 driver 1 PRESSURE TEST d Do not confuse break in wear marks on the cylinder walls for scoring An engine with an air leak exhibits Scoring of the cylinder wall will be erratic idle and or excessive R P M rough to the touch Be certain to re Test the crankcase for air leaks using place gasket if worn The 21 2cc the special tools as listed engine is manufactured with a chrome
3. TRIMMER ENGINES Models 212CST 213CST 214DCST amp 215SST SNAPPER POWER EQUIPMENT McDonough GA 30253 MANUAL 07415 IR 4 88 TABLE OF CONTENTS TWO CYCLE ENGINE THEORY ode eret rios ort Ded t e EDU a 3 steven casts ea tese qat eb t E atas ee M eO 4 INTRODUCTION m DEM MN 5 POWERHEAD CHANGES tt iiseeesein erem tee iesu ade t a E 5 MANUAL n etui rp DAD e m tute MR A ae 5 FAN HOUSING alta o Um bct retraite ree b eei 5 6 FLYWHEEL IGNITION SYSTEM icvessscsscscussscccsntssoosscatessvasscaosdsesdeondevasnvnisscosencadiuiasonesebovocscoseseccodelcoe 6 7 STARTER Gesn ies ease e dS aspe e e LE daha nic Mr a E et 7 9 nei E 9 10 CARBURETOR amp FUEL SYSTEM trieste sortent ein rina cte Ui edere duae pad 10 CABBUPETORS trees a a S etie or d 10 ZAMA NON GOVERNED CARBURETOR sssssssssessesssssesssesssueseesussessucsucsscsesessscssesscsverseavesvesee 10 11 WALBRO GOVERNED CARBURETOR ccssccsssssssessssessesscssssueseesesassussesssesesecsssuesssssatersasereecerceseeees 12 GENERAL CARBURETOR INFORMATION treten 12 FUEL TANK SYSTEM uL aires iei a uide vm cha e CE cire i indi e tena rea gs 13 EXHAUST SYSTEM usciti idit emat a spe e 13 14 THESPOWER FIEAD eda ettet s erat sens Studiis
4. 1 INTAKE PLATE 42187 cylinder Always check model serial 2 INT PL GASKET 42188 number and lllustrated Parts List be 3 EXHAUST GASKET 42189 fore ordering cylinder and piston 4 PRESSURE TESTOR 42190 Retorque cylinder screws to 71 81 in Ibs b Place the exhaust shut off gasket over the exhaust port and install the M PISTON REMOVAL muffler Install the intake gasket and shut off plate Use two 2 short 1 First remove piston rings then the snap M5x0 8 screws to retain the plate rings The snap rings are located on both With the sparkplug secure pressur sides of the piston pin Utilize piston pin ize the crankcase to 6 5 See driver part number 42185 Figure 31 to extract the pin Line up the driver in cider to push the pin without binding Place a rag under NOTE the piston when nearing completion as the needle IF THE SYSTEM LOSES MORE THAN 1 LB bearings may release from the cage See Figure 6 PER MINUTE LOCATE THE LEAK CHECK FOR LEAKS AROUND THE ADAPTOR 2 Remove the piston and account for all 21 GASKETS OIL SEALS OR ANY POROUS needle bearings The cage retainer should AREAS OF THE CRANKCASE be pressed out if replacement is necessary 14 Press new cage in evenly so that it protrudes from the connecting rod equally on both sides N CRANKCASE 1 To separate the crankcase halves remove the four retaining screws located on the starter side of the case See Figure 34 STARTER SIDE OF
5. CRANK CASE FIGURE 32 3 The piston has a ring locating pin Be certain that the ring end gap fits around the REMON pin during assembly The arrow on the SCREWS TO piston dome MUST face the exhaust port EE Lightly coat a new piston cylinder with 32 1 fuel mixture oil prior to assembly See FIGURE 34 6 Figure 33 2 Pull the crankcase apart and remove the two dowel pins The crankcase shaft will pull out or can be gently pressed into the case The crankshaft connecting rod ARROW assembly is assembled at the factory and MUST FACE cannot be serviced If damaged it must SORT WHEN be replaced RING N RE INSTALLING LOCATING PISTON Lor Nu O MAIN BEARINGS AND OIL SEALS 1 The 21 2cc engine uses needle main bearings 2 To press out the needle bearings use a socket with a slightly smaller O D than the I D of the crankcase opening Al ways press bearings on the outside rim or border Reinstall bearings using the same method Lightly coat the bearings with 30 weight oil making installation easier Press bearing so that it protrudes into the inside of the crankcase The surface of the bearing should measure FIGURE 33 4 To make needle bearing retention better during piston pin insertion lightly grease the inside of the cage Reinstall the piston Ast 11mm from the crankcase mating surface 4 in removal Ensure that piston pin enters half See Figure 35 piston and connecting rod straight Rein stal
6. POCKET SECURELY FIGURE 14 11 WASHER 12 13 HOLD ROPE BETWEEN FINGERS STARTER ROPE Feed the starter rope through the rope guide and seat the drum securely against 14 the starter Torque drum screw to 18 21 in lbs Insert rope through handle install washer and knot end of rope securely See Figure 15 15 TIE KNOT SECURELY Q 16 y STARTER HANDLE FIGURE 15 With the rope hooked in the starter drum notch make several counter clockwise rotations in order to place tension on the starter spring There should be ample recoil strength to retract the handle back to the rope guide Refer to Figure 16 Finally test recoil strength by pulling out all starter rope and holding between fingers as shown There must be approx imately 1 4 turn of play left in the starter drum after full extension of the rope If there is not sufficient play take one rota tion on the drum in the reverse direction See Figure 16 PULL STARTER ROPE OUT COMPLETELY 1 lt APPROX 14 PLAY FIGURE 16 9 17 At this point the starter housing could be reinstalled on the engine or the ratchet assembly serviced Re torque the starter housing retaining Screws to 12 16 in Ibs Use loctite The starter drum engages with the starter ratchet to turn the engine for starting Using a 12mm wrench hold the low er ratchet nut stationary and remove the upper ratchet nut Next remove the rat
7. 8 umouy 1593 8 jeorueqoaw EB 02132213 yang 5 ONILOOHSATENOUL JNION3 ATOAD OML 92 2 12 NOTES Service Manual for SNAPPER TRIMMER ENGINES Models 212CST 213CST 214DCST amp 215SST SNAPPER POWER EQUIPMENT McDonough GA 30253 MANUAL 07415 IR 4 88 Printed in U S A
8. OOSE WORN BENT e PULSE PASSAGE LEAKING RESTRICTED FUEL PUMP DIAPHRAGM GASKET LEAKING STIFF MISASSEMBLED COVER SCREWS LOOSE INLET SCREEN RESTRICTED PLUGGED e THROTTLE PLATE SCREW LOOSE e THROTTLE RETURN SPRING DEFECTIVE THROTTLE STOP BENT DAMAGED METERING SYSTEM INLET NEEDLE STICKING INLET NEEDLE LEAKING DIRTY WORN TIP WORN SEAT e INLET LEVER SPRING WORN BENT IMPROPERLY INSTALLED INLET LEVER SET TOO HIGH INLET LEVER SET TOO LOW METERING DISK WORN METERING COVER VENT HOLE RESTICTED PLUGGED METERING DIAPHRAGM GASKET LEAKING DAMAGED IMPROPERLY INSTALLED COVER SCREWS LOOSE WELSH PLUGS LEAKING LOW SPEED FUEL PASSAGES RESTRICTED PLUGGED HIGH SPEED FUEL PASSAGES RESTRICTED PLUGGED LOW OR HIGH SPEED NEEDLE SEAT DAMAGED WORN LOW OR SPEED TENSION SPRING DISTORTED WEAK MAIN NOZZLE CHECK VALVE STICKING BLOCKED MAIN NOZZLE CHECK VALVE LEAKING e p Sunum sn Sx9o 30 His ci rA 5 at 0j aunsseJg aeda Asana 2 D i 19V 3318Wi1WiTN uod eyeqwi 18 pue usamjeq
9. TAINING SCREWS METERING DIAPHRAGM FIGURE 24 2 Inspect the inlet system as in the Zama carburetor except reset the inlet lever flush with the carburetor floor See Figure 25 RESET INLET LEVER FLUSH WITH CARBURETOR FLOOR FIGURE 25 12 3 While the carburetor is off the unit always inspect the condition of the fuel pump section Replace any suspect components The governor A is a spring and check ball system tha releases fuel by engine vibration Approximately 6500 R P M The governor cannot be replaced but can be removed and cleaned Reseal governor screws with Seal or clear nail polish See Figure 26 4 Examine the speed needles for tip damage and set to specs HIGH SPEED NEEDLE 1 turn from seat LOW SPEED NEEDLE 11 4 turns from seat GOVERNOR A CLEAN amp REPLACE FIGURE 26 GENERAL CARBURETOR INFORMATION While carburetors may change slightly during the production of the 21 2cc engine basic repair troubleshooting techniques remain the same 1 Pressure test to 6 P S I for leaks of inlet welch plugs and fuel pump 2 Inspect all diaphragms gaskets for dry rot and tears 3 Clear all atmostpheric vent holes in covers 4 Clean all filters screens 5 Inspect inlet systems for bent springs Swollen needle tips proper lever height 6 Inspect and set high low speed needles 7 Ensure proper order of gaskets diaphragms For additional information refer to the carbureto
10. arburetor manifold and gaskets As always make note of the order and position in which the components are removed Replace INSPECT all worn or torn gaskets Refer to Figure 18 PLIABILITY 3 Reinstall the air filter assembly be certain to place the two 2 washers spacers beneath the choke plate Tighten the airbox retaining screw on the choke plate lightly and test movement of choke shutter before final torque Torque to 25 30 in Ibs Some metal airbox units were equip ped with carburetor studs instead of screws In those cases nuts retain ed the airbox Tighten nut to 20 25 in lbs Refer to Figure 18 FIGURE 19 E CARBURETOR AND FUEL SYSTEM 1 Because of the various applications of the 21 2cc power unit several different car buretors are used on the engine This manual will cover the two basis types Zama Trimmer carburetor Walbro Trimmer governed carburetor 3 Remove the inlet needle retaining screw to release the metering system See Figure 20 10 7 Reinstall the new plug with any device that is the same dimension as the welch plug Seal the weich plug with Seal All or clear nail polish 8 Remove the fuel pump cover for inspection of the fuel pump gaskets diaphragms and screws Ensure proper reassembly order of gaskets diaphragms See Figure 22 RETAINING NEEDLE FIGURE 20 4 Inspect the rubber tip of the needle for swelling or dry rot The lever spring
11. ber acu dr huss 14 PRESSURE TES tere Deuce 14 PISTON HEMOVAL Re er e REN Ee ote 14 15 CRANKCASE bled cese ined 15 MAIN BEARINGS amp OIL SEALS eerte 15 16 CARBURETOR TROUBLESHOOTING GUIDE r r e aa naraka 17 21 2 cc TWO CYCLE ENGINE TROUBLESHOOTING PROCEDURES ces 18 IT IS THE POLICY OF SNAPPER POWER EQUIPMENT TO IMPROVE ITS PRODUCTS WHENEVER IT IS POSSIBLE AND PRACTICAL TO DO SO WE RESERVE THE RIGHT TO MAKE CHANGES OR ADD IMPROVEMENTS AT ANY TIME WITHOUT INCURRING ANY OBLIGATION TO MAKE SUCH CHANGES ON PRODUCTS MANUFACTURED PREVIOUSLY e 6 TWO CYCLE ENGINE THEORY TWO CYCLE ENGINE OPERATIONS The two cycle engine has two strokes or cycles in which to complete all of the steps necessary to achieve com bustion as follows COMPRESSION BUILDS amp SPARK FIRES INLET FROM CARBURETOR UPWARD STROKE UPWARD CYCLE THE UPWARD STROKE OR CYCLE of the Piston creates a vacuum in the crankcase which sucks the air fuel mixture from the carburetor At the same time the piston seals off the transfer and exhaust ports and compresses the fuel charge in the combustion chamber Near the top of the upward stroke the spark plug fires the fuel charge EXHAUST PORT PORT Piston caused by the exploding fuel seals the inlet from the carburetor and begins to build pressure in the crankcase As the piston continues downward the exhaust po
12. chet assembly by winding it off counter clockwise See Figure 17 REMOVE RATCHET ASSEMBLY BY TURNING COUNTER CLOCKWISE FIGURE 17 The entire ratchet assembly must be replaced if any part of it becomes worn or broken Reinstall the ratchet hand tight and retorque the upper nut to 150 168 in Ibs D AIR FILTER To remove the air filter assembly re move the two air filter cover retaining Screws Lift the cover off and remove the air filter seated in the back of the cover See Figure 18 CARBURETOR RETAINING SCREWS F CARBURETORS FILTER x 1 All carburetors on these engines may be checked for leakage with a simple pressure tester Connect the hose of the tester to the fuel inlet nipple and pressurize the carburetor to 6 P S I The carburetor should be able to hold 6 P S I with no leaks Leaks may occcur at the inlet needle welch plugs or fuel pump gaskets cover The inlet needle should release pressure at 16 29 P S I COVER RETAINING SCREWS G ZAMA NON GOVERNED CARBURETOR 1 Inspect primer bulb for visible leaks before disassembly 2 To inspect the metering portion of the carburetor remove the two 2 cover retaining screws Inspect the diaphragm for tears and pliability Ensure that the cover vent hole is open and the cover is in good condition Also examine the meter ing disc for breaks See Figure 19 2 Remove the two inner air filter screws and remove the c
13. cle power unit POWERHEAD CHANGES There have been various minor changes to the 21 2cc engine since its introduction several years ago There fore when servicing a particular unit always identify the model number and serial number prefix in order to reference the correct Illustrated Parts List MANUAL LAYOUT This manual will cover the various configurations of the POWERHEAD since its introduction Beginning with the removal of the Fan Housing the manual will proceed through tear down techniques until the unit is completely disassembled Special assembly procedures will be noted during the disassembly pro cedures Where there are two versions of the same component the parts will be covered separately one preceding the other A FAN HOUSING CLUTCH 1 To gain access to the clutch and drum remove the four fan housing retaining screws REMOVE FOUR 4 HOUSING SCREWS FOR REMOVAL OF HOUSING 2 The clutch drum and drive coupler in the fan housing are supported by a roller bearing 3 To remove the drum insert a deep socket into the fan housing as shown Support the ends of the fan housing so that the drum and bearing may be pressed out Do not tap out the drum You must use an arbor press or like device for this opera tion See Figure 3 INSERT DEEP SOCKET TO REMOVE CLUTCH DRUM amp BEARING FAN HOUSING FIGURE 3 4 Remove the bearing from the drive adapt or shaft by first lifting off the wa
14. d to compensate for seasonal temp eratures and a gasolines purchased during the summer may not provide easy starting in the winter Gasoline should be bought as needed and not stored over a long period FAMILIARIZATION This manual was prepared to expedite service repairs on the SNAPPER 21 2 cc Power Head Engine At the time of writing the data contained herein was com pletely up to date However due to SNAPPER S continued improvement in design requirements it is possible that the appearance of component parts may vary slightly from those of the actual engine being re paired MUFFLER SPARK GUARD PLUG CLUTCH amp FLYWHEEL HOUSING THOTTLE CONNECTION CARBURETOR NOMENCLATURE The nomenclature drawing below shows the essential parts of the SNAPPER 21 2 cc Power Head Engine It is recommended that all mechanics and other repair personnel become thoroughly familiar with the controls components and operation of this engine before attempting any repairs MUFFLER SPARK ARRESTOR RECOIL STARTER ASSEMBLY STARTER HANDLE PRIMER BULB AIR FILTER VENTED FUEL CAP CHOKE CONTROL 9 0 SERVICE MANUAL 21 2cc ENGINE INTRODUCTION The purpose of this manual is to provide service in formation and procedures that will enable you to properly service the SNAPPER 21 2cc engine a versatile dependable 2 cy
15. l snap rings Use new rings if old snap rings are disformed 15 INSERT DEEP SOCKET TO REMOVE BEARING FIGURE 35 R P M SETTINGS Plus or minus 200 RPM MODEL 212 213 214 215 IDLE RPM 2500 2500 2500 2500 FULL THROTTLE 7200 16 7200 6800 7200 CLUTCH ENGAGE 3300 3300 3300 3300 CARBURETOR TROUBLESHOOTING GUIDE WON T HARD START ENGINE COLD NOTE This guide should only be used when standard engine troubleshooting procedures WILL NOT IDLE indicate a problem with the fuel system e Verify fuel condition amp proper mixture e Verify adequate secondary engine compression us e No primary air leaks and must hold ACCELERATION adequate primary crankcase OR POORACCELE p compression DECELERATION e Initial carburetor low speed high speed and idle adjustment set to HIGH e POO LOW POWER m manufacturer s recommendations SPEED WIDE OPEN THROTTLE MINOR ADJUSTMENTS LOW SPEED NEEDLE HIGH SPEED NEEDLE IDLE SPEED SCREW FUEL SUPPLY SYSTEM FUEL CAP VENT RESTRICTED PLUGGED FUEL FILTER LINE RESTRICTED PLUGGED FUEL LINE LOOSE DAMAGED DIRT IN FUEL PASSAGE AIR INTAKE AND FUEL PUMP SYSTEM AIR FILTER RESTRICTED e CARBURETOR BOLTS GASKETS LOOSE LEAKING THROTTLE SHAFT PLATE LOOSE WORN e THROTTLE SHAFT PLATE BENT BINDING CHOKE SHAFT PLATE L
16. lywheel off the crankshaft See Figure 7 PLASTIC MALLET TAP NON MAGNETIC SIDE OF FLYWHEEL UNTIL LOOSENED MAGNETIC SIDE OF FLYWHEEL FIGURE 7 2 As a general rule the magnet on the fly wheel should be strong enough to hold the flywheel to a screwdriver Letters on on the flywheel S SEM stand for the brand of the ignition that the flywheel should be keyed to 2 AAG Fe finet Exception SEM 32 ignition should be keyed to the keyway for Wab sh ignitions Ve US Ae 3 Asheared woodruff key will adversely affect the timing of the engine Ensure that the key is in excellent condition be fore reinstalling the flywheel Torque flywheel nut on clutch to 150 165 Ibs DE 4 The theory that an ignition either works or does not work is not always true Electronic Ignitions can produce inter mittent spark or spark only at certain temperatures Refer to the troubleshoot ing guide when in doubt about ignition problems Replace the ignition by removing the two retaining screws and disconnecting the module wires See Figure 8 lbs REMOVE RETAINING REWS DISCONNECT FIGURE 8 5 Reinstall the ignition assembly leaving the retaining screws finger tight Place a 012 feeler gauge between the ignition and fly wheel as shown Rotate the flywheel until magnets are adjacent to the ignition draw the ignition tight against the flywheel Torq
17. must FUEL PUMP be in original form to operate the lever DIAPHRAGM Cer properly Replace any components that 2 are suspect Reinstall the needle with care Ensure that the spring is seated in the casting and is under the dimple on FIGURE 22 the bottom of the lever 9 Remove high and low speed needles 5 Set the metering lever so that the back of inspect tips for damage Reinstall the high the lever is flush with the top of the car speed needle one turn from seat and the buretor body If the lever is not flush gently low speed needle 1 1 4 turns out from seat bend the lever until the desired setting is DO NOT wind the needles tight when achieved See Figure 21 seating Damage to tips will result See Figure 23 LOW SPEED HIGH SPEED NEEDLE NEEDLE MAKE CERTAIN INLET LEVER IS FLUSH WITH THE TOP OF THE CARBURETOR BODY 0 FIGURE 21 6 Replace welch plugs only if a leak is found Gently punch the welch plug being careful not to damage the casting below Refer FIGURE 23 to Figure 20 11 H WALBRO GOVERNED CARBURETOR 1 Installed on all Trimmers that accept Brush Grass blades the Walbro governed car buretor governs engine speed to approx imately 6500 R P M The Hunting characteristics or raising and lowering of engine R P M is normal with this carburetor No other type of carburetor should be substituted Inspect the metering side for dry rot or torn gaskets diaphragms See Figure 24 COVER RE
18. ot and removing the washer See Figure 11 UNTIE OR CUT KNOT REMOVE WASHER H Q STARTER HANDLE STARTER ROPE FIGURE 11 WARNING USE FACE MASK OR PROTECTIVE SHIELD BEFORE ATTEMPTING NEXT STEPS 7 To remove starter drum remove the single retaining screw and washer The spring beneath the starter drum is still under ten sion Gently remove the starter drum with a slight twisting motion See Figure 12 REMOVE RETAINING SCREW amp WASHER STARTER STARTER DRUM HOUSING FIGURE 12 NOTE IF ONLY REPLACING DRUM ROPE ASSEMBLY BE CERTAIN THAT STARTER SPRING REMAINS SEATED FLUSH AGAINST STARTER HOUSING IF THE SPRING IS NOT FLUSH IT MAY HAVE TO BE REMOVED AND REWOUND BY HAND TO REMOVE SPRING GENTLY TAP STARTER ON TABLE FACE DOWN TRAPPING THE UN WINDING SPRING AGAINST THE TABLE 8 While an existing spring must be wound by hand or machine a new spring comes pre wound Firmly grasp the spring and remove the retention band 9 Gently install spring into housing Ensure that spring is flush on housing floor The open end of the spring should go around the boss located at the 12 o clock position and face away from the rope See Figure 13 TOP OF HOUSING OPEN END OF SPRING FIGURE 13 10 Reinstall new rope with knot securely tuck ed away in the pocket as shown Apply a light coat of grease to the spring side of the drum See Figure 14 STARTER TUCK KNOT IN
19. r troubleshooting chart in this manual or your Illustrated Parts List J FUEL TANK SYSTEM K EXHAUST SYSTEM 1 Remove the starter assembly as explained 1 This engine is equipped with a plastic 2 earlier Gently pry off the fuel line Refer muffler shield to Figure 9 page 2 Recalling that the one shield retaining 2 The fuel tank system consists of screw was removed with the starter re A Tank the last two screws to remove the B Vented fuel cap shield See Figure 29 C Hose Fuel Pickup D Hose Fuel Return On By Pass MUFFLER Primer Carburetors SHIELD E Fuel pickupf filter See Figure 27 SPARK ARRESTOR RETAINING PLATE RETAINING SCREWS SHIELD RETAINING SCREWS FIGURE 29 D NOT ILLUSTRATED 3 Becertain to include metal inserts when FIGURE 27 reinstalling shield NOTE Exhaust outlet on plastic shield allows for spark 3 Retrieve the pickup with a bent paper clip arrestor screen to be serviced without Replacement of filter grommet and line can removal Referto Figure 33 be done without removing the fuel tank from the unit Never replace the filter with 4 Ensure that exhaust gasket is not cracked out close examination of the fuel See and spark arrestor is clear Replace spark Figure 28 arrestor screen rather than attempting to clean it Cleaning the screen will normally result in enlarging screen holes reducing FUEL screen s effectiveness to stop sparks
20. rer s warranty Be cause of its affinity for water the alcohol in the Gaso hol draws water from the atmosphere Since the density of water is greater the gasoline it settles to the bottom of the tank along with the alcohol There is no effective way to remove the water Water con taminated Gasohol washes the cylinder walls of lubricant 1 Alcohol Detection Test In areas where Gasohol may pose a problem a simple test for the presence of alcohol can be performed To perform a test a graduated glass Cylinder is required and may be purchased from your local lab equipment supply center To be gin the test pour equal amounts of gasoline and water into the measuring cylinder and stir or shake well Let the mixture stand for several minutes 2 Reading the Cylinder The presence of alcohol in gasoline can be de termined as follows A If there is no alcohol in the fuel the amount of water and gasoline will be the same quantity as originally poured B If there is alcohol present in the gasoline the quantity of water will be greater than the amount originally poured into the cylinder MIX FUEL by pouring half of the gasoline and all of the oil into an approved fuel container Cover the container and shake vigorously Add the rest of the gasoline and shake again to thoroughly mix fuel and oil NOTE When two cycle engines are used only occasionally there may be trouble starting the engine because most gasolines are adjuste
21. rt is uncovered and burned gases escape from the combustion chamber Near the bottom of the downstroke the transfer port is un covered by the piston and the compressed air fuel mixture in the crankcase rushes into the combustion chamber While some fuel escapes through the ex haust port the whirling motion of the incoming fuel charge clears the combustion chamber of almost all burned gases while limiting the escape of fresh fuel 3 TWO CYCLE LUBRICATION Engine lubrication depends on the addition of oil to the gasoline When this mixture passes through the carbu retor it becomes vaporized allowing tiny droplets of oil to lubricate all internal surfaces TWO CYCLE GASOLINE Use either regular grade leaded or regular grade unleaded gasoline Two Cycle fuel is a mixture of gasoline and lubricating oil The ratio of gasoline to oil is important Always use SNAPPER 32 1 two cycle custom lubricant following the mixing table instructions on the bottle or can If SNAPPER lubricant is not available you can use a quality brand two cycle oil at a 20 1 ratio DO NOT USE LEADED OR UNLEADED GAS OLINE ALTERNATELY because changing fuel types can cause serious engine damage and void Manufacturer s warranty Always use regular grade leaded gasoline or always use regular grade unleaded fuel Use only one type e GASOHOL USE IS PROHIBITED as a fuel in any SNAPPER Two Cycle engine product It will damage the engine and void the Manufactu
22. sher and removing the snap ring 5 Using a bearing puller or by supporting the bearing between two surfaces as shown press the shaft through the bear ing Reinstall bearing by pressing on inside of clutch drum using the same techniques as removing the bearing See Figure 4 PRESS SHAFT REMOVE THROUGH BEARING WASHER amp SNAP RING BEARING SUPPORT FIGURE 4 6 Reinstall clutch drum assembly by first reinserting washer into fan housing rounded portion of washer facing in Lightly coat the housing where the bearing will be inserted with clean 30 weight oil Pressing on the center of the drum press the assembly in until it seats Be certain that assembly is not uneven when applying press force See Figure 5 PRESS CLUTCH DRUM amp BEARING ASSEMBLY INTO HOUSING FIGURE 5 7 Clutch removal is made easy with special tool part number 42186 First remove the spark plug and insert a knotted piece of rope into the cylinder to act as a piston stop Remove clutch in a counter clock wise direction Any portion of the clutch may be serviced separately by removing the two clutch springs See Figure 6 TURN COUNTER CLOCKWISE FOR REMOVAL SPECIAL CLUTCH REMOVAL TOOL FIGURE 6 6 B FLYWHEEL IGNITION SYSTEM 1 Remove the flywheel by holding the en gine slightly off the table and tapping the non magnetic side of the flywheel with a plastic hammer Once loosened pull the f
23. ue the ignition retaining screws to 12 16 in Ibs Reconnect module wires C STARTER 1 Like the fan housing the starter housing is offered in metal or plastic Shown here in plastic the main difference between the two housings is the method by which the fuel tank is retained 2 service the plastic starter remove the three retaining screws one of which is the muffler shield screw The starter housing in conjunction with a cast section on the crankcase form the fuel tank brackets Both areas must be covered with appro priate tank cushions as shown See Figure 9 REMOVE THREE RETAINING SCREWS WHEN RE INSTALLING _ STARTER ASSEMBLY MAKE CERTAIN FUEL TANK CUSHIONS ARE IN PLACE MODULE WIRES 3 The metal starter is fastened in the same manner as the plastic fan housing 4 While the starter mechanics on the metal starter are the same as the plastic starter the fuel tank bracket assemblies are very different The metal starter and brackets are shown here in order of disassembly Refer to Figure 9 Because the two starters operate the same only one type the plastic starter will be depicted to demonstrate drum rope and spring replacement To replace starter components first pull a section of cord out from the spool and release coil tension The rope should then dangle without recoiling See Figure 10 STARTER SPOOL FIGURE 10 6 Remove the handle by untying or cutting the kn
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