how can i hit higher rpm

[00763aaron]

how can i hit higher rpm with a stock motor on a dune runner would a hotter spark plug help or a more powerful coil or how about a bigger carb i want to hit like 25,000 rpm or higher

 

[Deluge1]

Won't happen with a stock engine.

 

[Guest]

The engine has to be designed for higher rpm's. No bolt on product can do what your asking. As Dusty said even the fully worked over engines are hitting 20k.