MOPED QUESTION By datonamanmike (Read 328 times)

[datonamanmike]

i have a simple question i have a moped that is chain driven
my question is
if i put a smaller rear sprocket on it to gain some top end speed
will this increase or decrese engine RPM?

i would also like to know the same thing about the front sprocket
to keep some low end speed . but will making the front sprocket
bigger increse engine RPM or lower RPM ?

thank you in advance

[Alleyoop]

It will not increase your motors RPMS capabilities, it will REQUIRE more rpms to get to speed.
Alleyoop

[kz1000st]

Also keep in mind why your moped has that gearing. If you reduce that rear sprocket your moped might not have the rpm's to produce the horsepower to gain a higher top speed. Speed puts more load on an engine from both aero drag and the weight it's pulling. I thought about that with my 50cc bikes but nixed it. The bike produces a whopping three horsepower and weighs 180 pounds. I weigh about the same so I would be asking a three horse motor to pull 360 pounds faster than the 50 mph top speed it's capable of. Also lowering the gearing will hurt on hills. It struggles now, if I played with the gearing it would suffer even more. If I put a big bore kit, ported head and better pipe on it then that might be different.

[datonamanmike]

im not realy looking to increse my mopeds capabilities
im trying to find out if when im cruising along at top speed
will a smaller rear sprocket lower or increse my rpms

[kz1000st]

It will lower the RPMs.

[datonamanmike]

thank you KZ