Re: omc 4hp timing marks

[Mumbles]

The timing fixture and the flywheel keyways both have a miniscule amount of slop in them otherwise they wouldn’t fit over the key. Turning the motor over by the fixture takes the slack out of the keyway fit and true timing could be slightly retarded compared to the indicated timing on the marks. Allowable factory tolerance in the machining of the flywheel could also affect this. For everyday use, if the flywheel mark lines up between the two marks on the plate when checked with a timing light, the motor should run fine. Finer tuning of the mag will place the marks where you want.