May 17, 201313 yr Hello Ian, straight in fit, you'll need the 305 exhaust, first inch or so, to replace the same on the 300 exhaust, the head steady may need modifying slightly to fit the 305 engine, and the carb rubber (carb to airbox) will need slight tweek. Hope the 305 engine's a good-un, pistons distort and become noisey and new pistons are becoming rare.
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