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jd 425 flywheel position? fd620d

mike my tractor spun the flywheel, key sheared. how do timing marks work? the wheel has a 1, 2, and an r. what position should the cylinders be in with the marks. any help would be great.
Michael Mazura I got a John Deere 425 while I was mowing it backfired and died and now it will fire every now and then but turn over real fast I think I may have sheered the flywheel key but I don't have much knowledge on these kind of engine

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