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03-04-05, 11:18 PM

Aprillia are also building a 550cc twin engine, based on their current 450 unit.
So it'll be 550/450 in a RS250 chassis, should be very good. 70BHP quoted seems a bit much tho, I reckon that's crank figures.

03-04-05, 11:18 PM	#6
BURNER Guest Posts: n/a	Aprillia are also building a 550cc twin engine, based on their current 450 unit. So it'll be 550/450 in a RS250 chassis, should be very good. 70BHP quoted seems a bit much tho, I reckon that's crank figures.