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erik86

Yz450f build help

16 posts in this topic

I just rebuild my 03 yz450 and put everything back together and its like its locked up I can't kick start it..any suggestions

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Forgot to mention that when I put in the timing chain it was tight with no play at all

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I think it might have to do with the kick start the piston moves free but can't kick it..need help in a bad way

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Hey, can you put it in gear and roll it?

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Don't try bump starting it. If something is seized or your timing is off your likely to do much more damage. Obviously you did something wrong and it needs to be taken back apart. Seriously.

Edited by drtrcr400
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Hey Erik, your timing night be off too like drt said. Check that too.

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OK so I drained the oil and took the screw plug of the side and turned the flywheel with a socket and everything turns fine the piston isn't seized and cams turn fine? Is there a wrong way to put the kick start shaft in? I replaced the whole thing shaft and gears

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I got the timing right the first time I got TDC then lined up the indents on the cams

Edited by erik86

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If the crank turns, the bike rolls when it's in gear and the clutch pulled in (even if it isn't easy), Then it's the kick starter.  Drain the oil and coolant and lay the bike on its left side.  Open it back up and see what's wrong.

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OK I think I know what the problem is...I think the valves are hitting the top of the piston...so now how do I figure out what size shims to buy

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If that's the case, it's not shims you need. You have the timing out... be very careful or you'll just do damage.

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