Has anyone on here ever done or heard of someone putting in a 900, 929, 954 or CBR1000 engine into a F4 frame? I have heard of the F2/F3s with bigger engines in them, but no other swap. If so, exactly how much frame modification would it take?

 

You mean, no one has been curious enough to try this swap? Or had the resources to do so? What other weird Honda swaps have been done out there?

 

swingarm mounts diff, be cheaper to buy a bigger bike, and safer

 

But theres no fun in that!! I have had the bigger bikes, I like a challenge. I like the idea of sleepers, especially with the Hondas. They get no respect from the guys I ride with. Best on quality, but not the fastest thing out there.