YZF450 2010 Clutch adjustment help.



Just bought this bike and did not check the clutch in detail when i picked it up.

It has run for 62.3 hours from new, around 15 hours since the last major checkup from what i have been told.


I noticed one of the clutch-arm bolts on the engine side was a bit loose so i tightened it up.


Now that i have the bike running on idle and press the clutch lever and kick in a gear, the bike jerks a bit and dies.


I have tried to adjust the lever both ways but it does not matter which way i turn it.

Could i have adjusted it the wrong way when i tightened the bolt on the engine?


I got it running by giving a bit of more gas than i wanted and also rolling with it a bit.

After running it for  while and stopping it will not die with a gear in place, but i feel that it drags a bit.

It's also hard to get it in free gear while running, feels easier if i shut it off (not an exact science but felt like it when i stopped and tried to get it into free gear)


It was over 10 years since i rode a dirt-bike :) and never been much of a mechanic to begin with.


What could i start with? adjusting the cable down on the engine?


I would like not having to pull the clutch discs out as i will probably forget how to put it back again :)




PS. I can provide pictures if that will help.

Edited by molcos

In most cases, the engine end of the clutch cable is simply anchored to the cable housing bracket.  In other words, it's not actually adjustable at that end.  There is usually a secondary adjuster a little way out from the lever in "the middle" of the cable, which will be covered by a rubber sleeve to keep things out of it. 


Proper cable adjustment is when there is about 3mm of "free" cable travel, or cable travel that does not move any of the clutch release parts inside the engine.  In the free travel, you will feel very little resistance as you move the lever, only that from the return spring down on the clutch release arm.  The cable must have this free play or the clutch will slip under a load and become damaged.


If you have the correct free travel, and you still have the problem you describe, it is time to work on the clutch.  A properly adjusted clutch that drags, or fails to release as freely as it should when you pull the lever, is usually caused by plates that are no longer completely flat and straight, or by deep notches in the "fingers" of the clutch basket where the plates touch, or by unevenly compressed springs, or by a combination of these things.

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