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Well I dont think SV650's should be allowed in thunderbike since that replaced heavyweight sportsman which was mainly older bikes that couldnt run as well with the new bikes.
Seems like VFR 750's were successful at one time. As for lightweights being twins...that changes with manufacturers designs. FZR400's were the scat for a long time. CB400F's come to mind also.
. I would also like to see some numbers from the BMW dyno run. Air cooled on newer bikes is not that much of a disadvantage. I have been told that the bmw was putting out 140hp, don't know if that is crank or wheel.
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