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sportbike engine...r1, zx10r, gsxr1000, cbr1000rr? worked banshees wont touch 170+ hp.
now if you want a 2 stroke you cold always do what hill climbers did back in the day (1994) some guy took a YZ490 and took another YZ490 motor and make it a YZ980....it was a heck of a motor, 2 of them join together.
if you dont want a banshee motor you can also go with a RZ350 street bike motor...but its what the banshee motor was baised off of..if not find a RZ500...motor, but it will cost ya.
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I think the CR would be more then enough. If not the look into the 750 tripple twostroke H1 from Kawasaki.
Thats a lot of weight to add though and I'm sure the power to weight ratio of a CR powered Z would be a match for the stock 750.
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