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I bought a bobcat 225 with bad engine. It has subaru robin eh65. I bought used one on ebay that was off a side x side. I has to change crankshaft because it wasn't the threaded one. Once I put it all together it high rpm are all over the place. I got the idle correct but once it revs up to 62 hz it jumps all over like the governor is wrong. When I do weld the rpm drop and won't rev itself back up Also when welding it won't auto rev up but it will with hand tools. Any help would be great.