Racincr im not sure I follow you but sounds interesting please describe a little more.

I had thought about messing with the runner lenght like you say. I dont know that making it bigger would help or not but lenght may have some tuniing relavance.

a 26cc making over 5 hp. thats kind of hard to belive but i guesss its possible at that rpm as hp is a mesurement of how much work can be accomplisehed over a matter of time.

That wt 57 carb you talk about is unfrtunatly not listed in walbros archive so i cant get any info on it.