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Valve timing

by Michael Howard in 912 / 914 Technical Questions 5 years ago

Is there a source of valve timing information in the manuals?

If so where is it?

Are there any other sources of this information?

Re: Valve timing

by RotaxOwner Admin » 5 years ago

RotaxOwner Admin

59 1.58k 13.8k

912/914 valve timing is fixed (via gear drive) when the crankcase is assembled, so there is nothing to adjust for maintenance. You can see a photo of the timing mark posted in this forum thread: https://www.rotax-owner.com/en/rotax-forum/3-4-stroke-technical-questions/4188-timing-marks-on-rotax-912-camshaft-and-crank

Have a look at the IPC ( Illustrated Parts Catalog ) to see complete details of the valve train...

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Re: Valve timing

by Michael Howard » 5 years ago

Michael Howard

4 1 5

Follow up question.

If the cam is correctly timed to the crankshaft, at what angle, either before or after top dead center, do the intake and exhaust valves open and close?

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