i put a stage 1 cam and a je 12.5:1 piston in my bike and after 3 hours of breaking it in my timing chain snapped. i didnt adjust my tension at all. my advise read a little more into it. i dont know why mine broke but i am looking in to it. hope that helps.
Make sure you have the spring out of the tensioner (The 19mm bolt) Compress the tensioner all the way (release the "catch" and push it down), install the chain, install the tensioner - and then reinstall the spring - this will push the tensioner back out to the proper length. It can only self adjust one way - and that is out, and the spring does that.
Just pull it out, remove the spring, press the detent and push the guide back into the housing. Once you look at it you'll see how it works. When you re-install it it will automatically tension itself up against the timing chain.
There's pics in the service manual about it. If you don't have a service manual, get one! There's links to an online manual (zip file) in a few threads here and at least you can print out the pages you need for servicing different parts. :thumbsup:
ok so when i adjusted my valves the last time i noticed that the marks on the timing chain cam didnt line up exactly with the mark in the head when i had the motor a TDC. is it possable that my timing is off? i dont see the chain slipping a tooth or anything. the bike does run fine, i just noticed and seeing this thred aboout the timing chain reminded me.