Camshafts don't go to TDC. Are you refering to the cam position corresponding to the No.1 cylinder being at TDC?

I'm not familiar with your engine, so maybe I'm way off, but if you have the camshaft sprocket on the chain properly, then as long as the links are aligned on the two sprocket markers, you should be able to rotate the crankshaft until the camshaft dowel lines up with its sproket (just make sure the chain and sprockets rotate together without coming apart).

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