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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 3 Sep 2011
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Sticking valve

Hi while riding my TTR 600 yesterday I thought that the tappet noise was a bit louder it was running fine.
I stopped for a short time when I started the bike it fired up and then cut out stright away. I tried the kick starter again but there was alot less compression I was sure some thing bad was wrong but the bike did start again after a short time and the compression seems to be ok again.
I am guessing a valve is sticking, is this likley and if so what causes it.

I just rembered am pretty sure my bike has a non standered cam so maybe this is the problem or do valves sometimes just stick.

What do you think
Thanks
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Old 4 Sep 2011
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Possible carbon build from the cam change and not being set up correctly......
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Old 5 Sep 2011
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Do the TTRs have a de comp ? lever or mechanism sticking ? I have never had a sticky valve only failures where the timing chain was the cause..

How much more aggressive is the cam you have in it ? did you need to replace the valve springs with the new cam ?
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Old 6 Sep 2011
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yes I beleive it does have a decompression lever but its automatic....
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Old 7 Sep 2011
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Hi thanks for replys
The bike does have a decompression lever this is cable operated automaticaly from the kick start. I have checked this and is working ok I also had a look at the tappets and are all correct also checked the spark plug it was a little bit dark but not to bad.
If I want to invesgate further I need to take the head off I did start to take the rocker cover off but a couple of screws felt like they would strip the threads and the exhaust studs are also very rusty and will probadly break if I try to remove.
I have put every thing back together and see what happens.
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