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Re: upgraded parts :)
The 190 is a 150 with a longer stroke crank. It'll be a torque monster but less eager to rev with it's lower b/s ratio.
With the big bore, your getting a higher bore/stroke ratio (closer to MX type engines) which will be better for revs, the less low down torque should put less strain on the box and clutch, the increased rev range will help with the gear ratios, it'll move the power further up, help the power by un-shrouding the valve area and should vibrate less if balanced correctly.
They'll both be seriously quick in a pitbike but the BB would make more power with greater flexibility.
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Hybrid Mode
