if you know how to you can do some port work on the engine im sure soemone knows more about this than me but it can really make a big difference to any engine.the bigger carb is a good idea if you can find one to fit?.id stay away from your chosen fuel or your engine might not last too long.just with port work and a bigger carb and maybe a tuned pipe you will gain lots more power.how to do it thats the trick ,im no engineer but i know a man who is Rick where are yaa?.