47H, has the engine been overhauled? The reason I ask, is that if you are replacing a mag with a mag, and the engine hasn't been touched AND it was running before, then the govenor pinion shaft is NOT out of time. Your mag is internally out of time, which is actually pretty easy to correct.
If it is the govenor pinion shaft, you have to take the govenor off the front of the block. there will be timing marks on the cam gear and the govenor pinion gear. it is about a 45 minute job if you take your time.
If the mag is out of time, you have to take the cap and rotor off, and then the internal cover off that holds the rotor shaft on. there are timing marks L or R on the rotor shaft. I believe the J4 mag is CW rotation. If so, then line the rotor shaft up to the R mark with the bevel ground tooth on the mag shaft. Should take all of 15 mins.
I am sure that Gene or I will be happy to talk you through this in either case.
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