Valve shim adjust and improved performance

[Freaky]

Hi all, did my first valve adjustment on 2010 TE250 Saturday after a check showed that both exhaust valves were 0.05 too tight, I must say it's a work of art inside that cam cover, everything is in miniature compared to most other Jap stuff!
So, re-shimmed with 1.6mm shims and took for a test ride, you really wouldn't think that .05mm would make any difference to performance but I can tell you it does, in the lower revs the bike fells so much more responsive and pulls higher gears better, also I never had any problems with starting but now it starts as soon as the button is pressed where before it may have taken a revolution or two. Anyway, well worth the hour it took in the shed, check your clearances guys, tiny adjustments make noticeable differences!!

 

[ghte]

Great work and a very good point. Don't assume that because it starts easily the valves are in spec. Clearly there is an improvement to be had if the valves have not been checked for a while-I am guilty as charged and will get on to it this week

 

[duggoey]

I noticed the same thing. Mine were only .05 out, made a noticeable difference in the low end just off idle. First shim I removed I dropped into the motor, first shim I replaced I also dropped into the motor. Thankfully didn't drop down the cam chain run into the bottom end.

 

[bax3]

how many hours u doing between checks?

 

[fredd]

I noticed the same thing. Mine were only .05 out, made a noticeable difference in the low end just off idle. First shim I removed I dropped into the motor, first shim I replaced I also dropped into the motor. Thankfully didn't drop down the cam chain run into the bottom end.

I think is .005

 

[duggoey]

I think is .005

I'm talking metric millimetres, intake is 0.10-0.15 mm exhaust 0.15-0.20 mm.

 

[Freaky]

how many hours u doing between checks?

I'm not sure on hours but I was told by the previous owner that they were checked at 500 miles which is just before I bought the bike, I've done 1850 miles now and it's just over 3 years old, this is the first time I have checked them. Usually if valves are going to move they do it early in the engines life, if not checked and adjusted they will become tighter and tighter eventually the valve seats will be damaged or worse. The first people notice is a drop in power followed by poor starting, often it's too late once the poor starting occurs.

 

[bud7041]

I'm not sure on hours but I was told by the previous owner that they were checked at 500 miles which is just before I bought the bike, I've done 1850 miles now and it's just over 3 years old, this is the first time I have checked them. Usually if valves are going to move they do it early in the engines life, if not checked and adjusted they will become tighter and tighter eventually the valve seats will be damaged or worse. The first people notice is a drop in power followed by poor starting, often it's too late once the poor starting occurs.

Thanks Freaky for answering a question top job mate.

 

[bax3]

I'm not sure on hours but I was told by the previous owner that they were checked at 500 miles which is just before I bought the bike, I've done 1850 miles now and it's just over 3 years old, this is the first time I have checked them. Usually if valves are going to move they do it early in the engines life, if not checked and adjusted they will become tighter and tighter eventually the valve seats will be damaged or worse. The first people notice is a drop in power followed by poor starting, often it's too late once the poor starting occurs.

Ok thanks ive done 950klm so I will get them checked. Thankyou for the response

 

[bax3]

Got valves checked today all good after 27hrs, 1000klm.

 

[fredd]

Got valves checked today all good after 27hrs, 1000klm.

put the stainles steel valves and you dont have to check it again.

 

[duggoey]

Always have to check clearance regardless of valve material. In my case on the husky the clearance widened, guessing due to rocker arm or cam wear.