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OS 70 4 STROKE CAM TIMING

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Old 12-30-2007, 11:05 PM
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Mak Gyver
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Default OS 70 4 STROKE CAM TIMING

I have an older FS series 70 four stroke surpass OS ENGINE I am rebuilding. I would like to know how to reinstall the crank and cam to be in time. Thanks.
Old 12-30-2007, 11:52 PM
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w8ye
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Default RE: OS 70 4 STROKE CAM TIMING

The mark on the cam goes in line with the pushrods when the piston is at top dead center. There is a mark on the prop drive hub that indicates when the piston is at the top.
Old 12-31-2007, 12:04 AM
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masonman
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Default RE: OS 70 4 STROKE CAM TIMING

Your 4.8 1650 Hydrimax has a bad cell.
Couldn't get it above 4.1 volts.
The rest of them are looking quiet nice.
Think i will do them all three times to make sure there is no memory left.

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