3 Flowchart
Contents
1. IM M N we RAS 0 2 0 gt PARTS Flowchart 3 4 Chattering Chattering small vibration is often caused by various elements interacting with each other It is believed that chattering is caused due to combination of various elements such as compatibility of tire and chassis problems related to wheel and brake parts etc You have to check element by element because you may feel vibration at front portion even if the cause lies in rear part The suspension setup aims to decrease chattering O Check if the chassis is working normal to locate the cause Rattle of parts around the steering head pipe and operation of the front fork Rattle of parts around the rear swing arm and operation of the rear suspension Tightening torque of front fork rear swing arm pivot etc Is not torque too large Roundness and static balance of tires and wheels Damage to the wheel bearing and inner spacer Wear of drive system including driven sprocket hub damper Adjust repair or replace parts following instructions of service manual if there is any problem in items above A Problem occurs on straight course r Countermeasure Check static balance and roundness of r Symptom Problem depends on speed regardless of location r Symptom Problem occurs when lean angle is large C Problem occurs when leaning angle including large lean angle at the beginning of a corner r Phenomenon Vibrati2. Is not there abrasion rough surface on the front tire Too much stress is applied partially r Check item Is not projecting length of the front fork larger than standard STD value Is not the front portion too low r Check item Is the stroke amount of the front fork appropriate r Check item Is not rear stroke too large Check item Is rear machine height too large y 0 PARTS r Countermeasure Increase or decrease air pressure of the front tire r Check item Decrease projecting length of the front fork Lifted front portion r Check item In case of too much stroke Increase front preload or spring rate In case of too small stroke Decrease front preload or spring rate r Check item Increase rear preload or spring rate Check item Decrease rear machine height Flowchart B When throttle is on r Check item r Countermeasure Is not the projecting length of the front mem Decrease the projecting length of the fork larger than standard STD value front fork Lowered front portion Is not the front portion too low Check item Countermeasure Is not rear stroke amount too large NO GOOD Increase rear preload or spring rate Check item Countermeasure Is rear machine height too small Increase rear machine height N L L u
3. BASIC SUSPENSION SETTING GUIDEBOOK RACING PART gt CONTENTS 1 What is required for suspensions unnsunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn 1 1 1 Requirements for street use unussssssssnnnnannnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnannennn nennen 1 1 2 Requirements for racing use uunsssnssnssnnnnnnnnnnnnnnnnnnannnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnannnnen 1 2 HOW tO SOU UP ini ii 2 2 1 Diagnosis f symploms use a ee 2 2 2 Clarification of questionable points u 444440n4nHnnnnnnnnnnnnnnnnnnnnnnonnnnnnnnnnnnnnnnnnn nn 2 223 SSIUpproOcedulg a ee en ee ee 3 S PIOW CHAN 4a ende 4 3 1 Breaking ieni cnp eet EE Ei 4 COME A e C 5 3 3 Automatic turning of front handle toward inside seeeee 6 3 4 Tohatteringus E sm oet ee Mid i M eR E 8 nlil li lple de o ere e otc 10 CAUTION This guidebook only introduces general ideas about suspensions There may be some phenomena that are not consistent with the description in this guidebook We assume no responsibility for any accident damage injury or trouble caused by a macine which was set up with this guidebook as a reference Judge anything at your own risk Ask an expert if you have any question and proceed with setup carefully after making everything clear What is required for suspensions 1 What is required for suspensions YZF R1 amp R6 is commercially avail
4. able for street use only Requirements for street use and requirements for racing use to run in circuit course quicker are different though It is important to understand phenomenon peculiar to racing use when you want a machine dedicated to racing use in order to raise potential of the machine by adjusting its feature accordingly 1 1 Requirements for street use Two seats Running over bumps such as unevenness of road and temporary road under construction com fort etc e Resistance to impact including external input under unexpected circumstances during normal running Machines for street use have setup to meet operational stability comfort and durability under such use condi tions Spring rate preload of spring and front fork leg oil level are important elements for setup of front forks They incorporate mechanism oil lock to deal with accidental heavy load and to block internal oil path around maximum stroke so that end of suspension will not contact the bottom to avoid unstable behavior of a machine in case of unexpected disturbance and to prevent damage of the suspension itself in addition to secure comport and stability during fast run Bumper rubbers installed to the suspension rod work for rear tires in a manner similar to the mechanism mentioned above 1 2 Requirements for racing use Hard braking enabled by high braking capacity Increased lean angle during turning enabled by high grip tires Control ab
5. cteristic of target spring and should not be higher than standard setup of KIT more than is necessary Minimum oil level R1 180 mm R6 160 mm Ni e RACING PARTS Flowchart 3 Flowchart This section describes typical symptoms of breaking turning automatic turning of front handle toward inside and chattering as well as their countermeasures Find the best suspension setup referring to the description 3 1 Breaking Point Adjust engine brake using YMS first to adjust sliding of rear tire during braking Phenomenon Unstable breaking sliding of rear tire r Check item r Countermeasure Is engine brake control sufficient Change YMS map If the problem is not still solved r Countermeasure Adjust engine brake using slipper clutch Check regulation of the race to be entered Check item r Countermeasure Is not front fork stroke too large dia front preload or increase spring rate Decrease the projecting length of the front fork lifted front portion Increase front compression r Check item r Countermeasure Is rear machine height too large Decrease rear machine height h y IN il RACING PARTS Flowchart 3 2 Turn Phenomenon Bad turning performance A When leaning angle It is hard to move to inside Large stroke Check item Front fork stroke Point r Countermeasure Increase fron
6. ere accelerating after turning is almost exit the corner There are many ways of trying setups appropriate for a situation Predict causes by diagnosing symptoms and try several ways to narrow down the cause and solve problems It is a given fact that all parts work correctly to follow the above procedure Therefore adjust setup after checking the tightening torque of each part and operation under no load if any trouble is suspected I ul L N L RACING PARTS How to setup 2 3 Setup procedure Narrow down appropriate value for machine posture under necessary conditions braking and cornering by adjusting spring rate and preload basically They vary depending on riding style course lap time or the like Narrow down the cause by diagnosing symptoms referring to remaining amount of suspension stroke etc adjust machine posture to supposable conditions based on diagnosis and find out appropriate spring load balance for front and rear suspensions Proceed with setup referring to the following flowchart while taking into consideration the symptoms and phenomena you experienced while driving as well as current setup Point It is possible to attain fine adjustment value of 0 925N mm for an optional spring of front fork by installing a spring of 0 9 N mm at one side and a spring of 0 95 N mm at the other side for example Air spring characteristics associated with front fork leg oil level can harm spring chara
7. hion Up to 20 to 30mm stroke displacement depending on conditions Braking Load change The harder the brake is applied the more the load is concentrated on the front Front fork Displaces until stroke has almost bottomed Rear cushion Reaches nearly maximum extended stroke Cornering Load change Increases the load on the front fork and rear cushion on both sides Front fork Up to 30 to 90mm stroke displacement depending on the size of the corner Rear cushion Up to 25 to 40mm stroke displacement depending on conditions I y 10 RACING PARTS Published by YAMAHA MOTOR ENGINEERING co LTD
8. ility when a tire is sliding Ability to follow road surface when there are gaps securing ground contact load of tires Circuit use needs much higher stability requirements of whole chassis as mentioned above Suspension setup suitable for a course lap time and tires to be used can raise the possibility of shortening lap time Spring load is the most important setup element of suspension for racing as it is for street use However previously mentioned setup for street use can cause difficulty of operation for racing use Some examples are as follows Soft spring rate for comfortable riding can cause too much movement of a machine due to fore aft movement of load In case of too high load setup in deep stroke range the entire suspension stroke may not be used smoothly to make you feel stiffness tightness when stroke exceeds certain point It is necessary to change spring reaction force spring rate preload and front fork leg oil level in this case and characteristic of damping force to control amount of load movement and speed during braking or accelerating so that appropriate machine attitude can be attained as necessary to solve these problems under such limited use conditions stable road surface condition like a circuit course Front and rear tires can attain maximum holding force to realize smoother riding characteristic by performing such setup correctly The KIT suspension aims to increase performance on a circuit course taking in
9. on from the front portion Check item Is not remaining stroke of the front fork too large Countermeasure Increase or decrease air pressure by up to 20 kPa N I RACING PARTS NO GOOD wheels and tires Countermeasure Check runout of wheels and tires r Countermeasure Increase front preload Decrease front compression Decrease front rebound Flowchart D Problem occurs when leaning angle with throttle off at the beginning of a corner r Symptom Countermeasure Vibration from the rear portion Countermeasure Increase engine brake control Increase or decrease air pressure by up to 20 kPa Decrease rear compression Decrease rear rebound E Problem occurs when exiting corner r Symptom Pumping periodical vertical movement of rear portion Check item Countermeasure Is not remaining stroke of rear Increase rear preload suspension too large Increase spring rate Decrease rear rebound Decrease rear compression L NO L y i a gt 0 2 0 gt PARTS Reference Bl Reference Front and rear load changes and front and rear suspension movement in different scenarios Accelerating Load change The wider the throttle is opened the more the load is concentrated on the rear Front fork Reaches nearly maximum extended stroke Rear cus
10. t preload or spring rate Decrease the projecting length of the front fork Lifted front portion Increase front compression r Countermeasure Decrease front preload or spring rate Increase the projecting length of the front fork Lowered front portion Decrease front compression Make the stroke amount of the front fork appropriate B During steady turning Throttle on or brake off Check item Throttle and brake operation Throttle off or brake on Point Countermeasure Increase rear preload Increase rear compression Increase front rebound Increase rear machine height r Countermeasure Decrease front preload Increase rear machine height Make the stroke amount of the front and rear suspensions appropriate C When rising up r Check item Throttle operation Point Almost or wide open r Countermeasure Increase rear preload or spring rate Increase rear compression Increase front rebound Decrease the projecting length of the front fork Lowered front portion Make the stroke amount of the rear suspension appropriate y MT l we ers H 0 gt Rac Flowchart FRAG ma 3 3 Automatic turning of front handle toward inside Phenomenon Steering handle is turned inside when turning Too much steering angle compared to lean angle A When throttle is off r Check item
11. to consider ation such elements N e 1 RACING PARTS How to setu 2 How to setup 2 1 Diagnosis of symptoms Figure 1 Under spring Figure 2 Over spring As shown in the figure 1 suspension stroke speed under springs is important when you want to improve ability to follow uneven surface Front and rear wheels basically move up and down to an appropriate degree compared to the chassis to absorb impact The suspension works at high speed under such conditions Acceleration and braking are continually repeated when running machine in circuit in most cases It may well to think that the whole machine as well as rider makes pitching movement to and fro as shown in figure 2 not that the wheels move up and down on such surface What is important for setting up suspension of machine for racing is How far you makes pitching movement at what speed Tires contacting surface also play an important role in fact and tire pressure must be also considered during setup 2 2 Clarification of questionable points It is necessary to judge phenomena of riding condition as specifically as possible when setting up racing suspension for a circuit In case of bad turning for example is the turning bad when you start turning before a corner with throttle off and starting to lean or when you are turning with large leaning angle Were you starting to open the throttle or closing it Was the turning bad when you w
Download Pdf Manuals
Related Search