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CRF150Joe

my new yz400F

6 posts in this topic

Ok guys so i was on ebay and there was this 400F not in that bad of shape but his reserve was 360 and i offered him 400 and he took it so i got it today and its not that bad but it doesnt run. I was told it has a new top end but it doesnt have enough compression to start it like i can use my hand to push the kickstarter down. I have no idea what it can be. This is a project bike so its about to be torn down and fixed up and i want to get the motor working first so does anyone have any ideas or places to start?

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Maybe the compression release is sticking? Or the valves are way out of adjustment and don't close? That's what I would start with.

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well i opened her up and i did the basic reoiling everything and the little tricks i got a little more compression but not enough so start it for sure. So my guess is that piston rings or the valves by looking at it.

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