I don't understand why running the engine at a higher rpm doesn't equal more top speed. If the engine is going to be revving 1000 rpm's higher than stock(about 18%), why wouldn't the machine have about an 18% higher top speed. This would be assuming the clutches are fully shifting out before and after the mods, correct?

 

"Maybe" if you had a manual trans. I think you would lose a lot out of a belt drive tran's. Don't get me wrong, I do like the belt drive.

 

im not agreeing or disagreeing with the previous posts. I get gunmans point but I think theres more then 1mph depending.

adding 1000rpm on a belt drive isn't the same as a manual as its not a direct translation of engine rpms to a given gear ration like a manual. You can add a thousand rpm but if your out of the motors power range it won't push the quad any faster. Ive gone down this route thinking I could just get top end by reving the motor out more and it didn't help me any. GPS I lost speed.

I have seen speed increases by changing sprockets but ot totally changes the clutches characteristics so its not as simple as a manual machine either. You can get top end but it puts more load on the belt drive and can decrease aceleration.

 

Engineering 101 if the motor is turning faster and the clutch is fully enguaged the atv will be going faster. I'ts not like a ten speed bike in 10th gear that will lug the motor down. That is the beauty of the pvt it will automatically keep the rpms up on the motor if the springs and shift weights are properly matched to the motor HP and upper RPMs. If you have sprokets that are sized to go faster and not enough motor to pull the atv faster it will simply not enguage the clutches all the way. If you are lugging the motor down you have the wrong clutch set up. On my ATV with the snowmobile engine everything is stock except for the motor. At 6500 rpms it runs right at 65 miles per hour. Same as a stock Sport. The motor will turn 9000 rpms so the increased rpms generates more speed. My clutch is set up to be fully enguaged at 6500 rpms that is where my maxium hp is at. So to answer your question yes if the clutches are fully enguaged the more rpms you run the faster it will go.