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I have  an HG42 that Ijust put  a new engine out of an OC3 in My HG manuel has timeing instruction for a WIXCO mag ,however this engine has a FAIRBANKS MORSEmag on it.We are haveing trouble timeing it .1we can't find TDC by  putting something into the cylinder and watching it rise as we rotate the engine.2 we put in an aux transmission which went great but we may have put the flywheel on wrong.As you can see we are not mechanics .how can correct the timing without taking thevengine out .thanks from a newbe who can hold a wrench