Sure you've sorted this out already, but here goes.
It's not uncommon for the timing marks not to line up perfectly if there is no tension on the timing chain. Make sure the timing chain is tight 'away' from the tensioner side. (i.e. so the crackshaft pulls the chain tight). if you rotate the crankshaft too anti-clockwise far over the timing marks, then back clockwise, the chain will be too loose and cam-gear to far.
Also - make sure you have the cam gear the right way around. It is marked "IN" to indicate which side must be on the inside. It will go on just fine the opposite way around, but the gear timing will be 1/2 gear out.
Lastly- the FT / RT marks should be at the "inspection hole" and not TDC of the crankshaft.
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Squily
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