ORIGINAL: Switch_639
ok so I am not reaching 10500 rpms with 14x8... and I am overpropping if I only get 8000rpm? the engine is not getting hot or lean... its very quiet 4stroke like sound at those low rpms with the stock muffler... its underperforming at 8000rpm? is it bad to be at such low revs? the engine has loads of pulling power though...
yep a lot
bolt a 14x6 and your engine will have a lot more power, right now im guessing a .91 four stroke could turn a 14x8 just as fast if not faster (still overproping the .91 fs too btw) . a .91 four stroke has the power of a .65ish two stroke.
change your prop from a 8 to a 6 and go from a .65-75ish engine to a .91 engine