Probably not much difference. Air flow is the power limiting factor on a TW200, more displacement won't make any more power, but will lower the torque and horsepower peaks if no other changes are made. Let the engine breath better to take advantage of more displacement. Tdub2 has 267cc, but the head is ported, 3-angle valve seats, 34mm EFI, cam with more lift and duration, and a less restrictive exhaust that clusters resonances and pressure wave effects closer to the torque peak. Result is a near stock torque curve than stock, than it climbs higher faster and does not fall off until 1500 rpm later. 267cc would probably stop pulling about 6000rpm if everything was left stock.