What Vojx says is so true. Harris and Bimota built their businesses on the fact that the Japanese couldn't build a chassis without it bending.
You have to spend a lot nowadays to see any significant improvement in performance and handling.
Starting from scratch would mean prohibitive costs. For example, the difference is speed and handling between a road bike and a World Superbike (based on the road bike) might be significant but the difference between £8k and £80k + is too. Take a British Superbike into accout, the performance is better (around 1/2 sec 0-100 maybe 3/4 sec off standing 1/4mile if you are lucky) yet this will cost around £30k.
If someone could produce a kit bike with GP or World Superbike performance for say £10k they'd be on a winner. How could they though? The donor engine will be the same as road bike, the weight similar, so they would have to spend £1000's on tuning.
It's a bit like using a Ferrari as a donor.
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