Does anyone have some aftermarket performance parts for 909R 4 stroke? WRH and Hetrick only sell for 2 strokes. Any other options out there?

 

If it is a Chinese honda copy cat motor then try Honda Trail bikes I have a redcat mpx 90 with a 114cc big bore kit and it rips for a 90cc I know it will out run a jet moto 200 in a drag. I got the kit from T-bolt USA. Look for thge 114 kit then I put a 24mm carb kit it goes good now.

T-Bolt