timing chain
Not sure on the TRX, but most newer 4 strokes have automatic chain tensioner. If it is a loose timing chain, it's probably at or near it's wear limit and needs to be replaced before it skips time and you put a valve through your piston. There are several things that can cause the ticking... My bike had the same problem. The timing chain was about half the problem. I think I should have replaced the cam sprockets at the same time... but a 20W-50W oil quited it right down after I was sure there was nothing real serious wrong and I had replaced the Cam chain.
thanks for the thoughts,,,i adjusted the valves and it goes away until the bike gets rode real hard for a while,, then it comes back..i know its not the valves working loose.cause i have checked and rechecked the clearance.maybe its normal for these 05s??
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does anyone know how to tighten the timing chain using the factory tensioner??my valve lash is good, but there is still ticking in the top end of my engine....oh,,its a 05 400ex