Camshaft timing for an OS .70 surpass.

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04-21-2005, 09:46 PM

relax1

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Camshaft timing for an OS .70 surpass.

How is the valve timing set on a OS 70 4 stroke, I have the crank out as well as the camshaft. I don't have an instruction manual. How is the camshaft set with the crank, is there a mark somewhere?
Thanks for your help.

Luis

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04-21-2005, 10:12 PM

proptop

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RE: Camshaft timing for an OS .70 surpass.

Hi Luis...you put the crank at top dead center, then insert the cam with the punch mark lined up with the lifter bore. Thus, it should be angled back toward the cyl. just slightly and not straight up.

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04-21-2005, 10:18 PM

w8ye

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RE: Camshaft timing for an OS .70 surpass.

The cam has a helical gear on so it will twist slightly as you put it in. You have to lead the final position.

The rocker arms and pushrod need to be off and the cam followers pushed up out of the way.

The timing dot on some cams is hard to find.

Enjoy,

Jim