That's already been established..., except for the 210 which has a different crank and stroke and the 'special' 250 crank specifically for Brazil -- presumably with an even less advanced keyway than the normal crank to help minimize pre-detonation of the lousy fuel typical of third world areas of S. America. The picture I posted clearly shows a difference in keyway location between a 210EZ crank and a FarmerTec 250 standard crank. What I lack is an OEM 250 crank to compare with the FarmerTec crank, but the plan now is to remove the cast in key from the 210 flywheel and advance the timing to hopefully get this damned thing running -- unless the coil is the problem. Then it's 'officially' junk.
Still looking for tips to get rid of the cast key without screwing up the flywheel and/or mating surface.