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IIRC, the 90 shares the same stroke as the 110, so you could (theoretically) swap a 110 jug and piston onto the 90, perhaps without needing to hog out the case. it wouldn't gain you much, but 20cc's would help. As Bruce pointed out, you'll need to rejet and you'll likely want a free-flowing exhaust.
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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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