other than the water pump bulge and drive on the cover, 660s bottoms should be quite like late 600s
Having a similar problem with my xtz660 based road racer, with 14:1 it's a bitch to start. there's plenty of itneresting manual decompressor options from the raptor guys, they might be simpler that the built in cam mech that tends to disintegrate and take out whole motors...
shame that with the TZ250 twin spar frame hugging the head in my bike, cant really use them!
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