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Discussion Starter #1
I'm actually a XR400 owner and this is a XR400 engine (I heard XR400 and 400EX are almost identical so here I am). I was wondering if any of you 400EX owners have had the same problem I'm having?

I can't get my timing marks to align as the manual says, it's slightly off. Just done an engine rebuild and I didn't look at the timing marks before tear down because I was replacing the cam chain anyway.

I thought maybe the new cam chain was defective so I refitted the old cam chain and the alignment is a bit worse if I remember correctly. I reinstalled the flywheel right up against the woodruff key to try and get the timing marks closer but it didn't make a difference.

Cam chain is new
Cam chain tensioner is fitted and extends/retracts properly
Camshaft lobes facing down
Piston is at TDC



With the flywheel aligned, I can see the right cam shaft gear line above the cyl head and I can't see the left cam shaft gear line.

 

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i would guess, seeing how your not using the CORRECT engine ?, this is what happends ^^ .
 
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