This might be a stuipid question... How many rpm?


New Member
Jul 2, 2017
Ok, so i have a mostly stock 66cc motor, the only real changes are a modified exhaust and a modified air filter to get more air to it.

My question is how do you calculate the rpm's on these motor's? Its pretty simple i bet.

Here is why im asking: i have the stock 44t sprocket, and after warming up for a bit, i can do 35-36 mph at a dead run. If this is about max rpm's, i wanna get a higher sprocket so i dont work the motor as hard. I know I've had it to 38 before, but that was with a slightly different exhaust. I dont run it like this all the time, really only 2 or 3 times. But i cruise at 30 all day long, it would be nice to go a little faster so i dont get run over...

If anyone wants I'll post photos. Thank you!