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why is my timing retarded? repost from the 700 board 200

posted by  someone claiming to be 240snowmobile on  Tue Sep 21 05:51 CST 2004 [RELATED]

"I took off the harmonic balancer and checked the alignment of the timing belt"

"So, my timing belt is ok, my balancer has not slipped,..."

The timing belt has NOTHING to do with the timing marks on the balancer's outer ring. TDC is referenced to the crankshaft, and nothing else.

The balancer has two major parts: an inner hub, aligned to the crank by a keyway. The second part is the outer inertia ring. Between those two parts is a heavy rubber ring, that allows the outer ring to move slightly in relation to the inner hub, thus dampening crankshaft vibrations.

It is that outer inertia ring that can slip and make the timing marks appear to be off. You will have to determine the true TDC (you can use a piston stop in cyl #1) and compare that to the marks on the balancer.






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