bikridr69

04 yz450 won't start. What am I missing?

5 posts in this topic

my buddy's 04 yz450 won't start. Put a new head and piston and rings on it. It started n ran but had a ticking/knock, sounded like from the top end. Checked the timing and it might have been a tooth off. Changed that and put it back together. Now it won't start at all, only tried kicking it.

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I would check timing again first. Also is there compression after reassembly? If not or low check for a bent valve (cup stuck partially down)

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I would check timing again first. Also is there compression after reassembly? If not or low check for a bent valve (cup stuck partially down)

It has compression (I didn't measure it with a tester) but feels the same as before when kicking. I will check the timing again and check for bent valves after work.

Edited by bikridr69

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