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I have a john deere model d . I over ran above 900 rpm on startup . now I checked the valve setting and the lh exhaust valve open setting occurs about 20 degrees after cover mark . could the cam have shifted that far? also if I set the spec lh exh to cover mark it appears that the impulse for the #2 cylinder will occur about 20degrees after tdc??? and same for the #1 cylinder ?? seems like it could be 20 degrees before or tdc but not after tdc?? the impulse marks on the flywheel and lh exh open mark are about 20 degrees off parallel which makes the firing 20 degrees after tdc also ?? what am I missing ??