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This is an interesting discussion, Bruce. I also understand that horizontal clone engines are based on the Z50 case, typically topping out at 125 (exceptions are the high-strung Piranhas, etc that are 140, 150 and beyond). The bore and stroke relationships as I understand them are as follows:
- 50 and 70 share a crankshaft but have different bores
- 70 and 90 share a bore but have different strokes
- 90 and 110 share a crankshaft but have different bores
- 110 and 125 share a bore but have different strokes
I can't recall where I learned all that, but it was most likely Dr. ATV or Scrappy Dog. If that info is correct, then a 90 could be bored to a 110 with just a cylinder and piston. I have no way of proving or disproving my statements, although I might have a Baja 90 crank laying around.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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