Probably add about 300kg to get back to the two speeder performance. Different if you are talking about a two speeder that has a state of the art modern day race tuned, methanol burning engine
"State of the art"? The ones I have seen have Jap engines, so even if altered to run methanol, I wouldn't call them "state of the art" by any stretch. We are talking a design dating back about 100 years. Or perhaps I'm missing something.
