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

Possible carbon build from the cam change and not being set up correctly......

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 ?

yes I beleive it does have a decompression lever but its automatic....

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.