My RPM is it to Hi ? (8800rpm)  By  Deleted (Read 2,954 times)

You could go faster by installing taller gears, and bring engine RPM down by 500-1000 RPM.

At those RPMs the engine does not have sufficient power to maintain those speeds.
Most of those engines are capable of doing 9+k RPM, (you can test this out by putting them on the center stand and revving them high), but at those RPMs the engine does not have much torque anymore, so it's not capable of going faster.

I've heard that 8000 and above is pushing it. On my scoot at 8000 rpm I'm topped out, and not really picking up anymore speed, but it's not as good a brand as Kymco though.

heavier sliders/rollers would most likely not do anything, as the variator is most likely already maxed out. Taller gears is the solution, combined with lighter weights, as the variator will be rotating faster.

Where i can find a Taller gears?
All the place i check, they are Back order...

I've done about all that can be done to a 50cc scoot you can get the gears if you like but they work better on the bigger kits I've said all I can say I won't tell you unless I have tried it which I have

I don't agree.
If the problem isn't caused by a worn belt or rollers/sliders, then the next logical step is the gearings.
If the engine is already reaching over 8k RPM, it has too much power to run with the stock gears, and a gear upgrade is needed.

If it is a 75cc BBK, my ATM50 has a 63cc upgrade and reaches to 47MPH, so you should be able to squeeze just over 50MPH out of it.

I'm sure the engine will pull the heavier gear, but I'd say only one tooth higher on the front and 2 or 3 lower on the rear or something).
You got to take out the stock gears, count the tooth, and find something that's one or two steps higher.

That is good Vermi,

Most folks think because of high rpms they think they have a lot of power that is not the whole story, you have to have good compression and there is no substitute for displacement which gives you the low end and mid-range power and torque to move the weight. You can take a high revving motor and it will be a dog because it may have low compression and is like a free wheeling wheel going up and down. Revving them up on the center stand with no load on the motor they will rev up high but get on that puppy and put a load on the motor and things change dramatically.

Running these motors at high rpms you will either blow it up or you will be re-building it. Sure some 4ts you can wind them up to near 10K but at high rpms you start to get floating valves and BAM piston will be destroyed or you will have a crank come out the case. Keep it in the safer zone high rpms are the most common cause of internal motor damage.

But some folks like to hear the motor screaming and think they are going 90mph then they are on here asking why the motor exploded.

If you have deep pockets and just want to get some QUICK but NOT LONG lasting thrills then wind that little motor up
Alleyoop