The question I have for you is if the bike is still stock? What is the mileage? I sounds like someone tried to modify it and failed to tune it properly. If you still have the stock exhaust, it should be fairly quiet. If you have a performance type aftermarket muffler, they are a lot louder. The high rpm to get moving is from the clutch engagement set too high. The trans needs to be set up properly with the correct combination of clutch springs, and variator roller weights. It also seems like the carb is not jetted properly. Is the carb still stock(17.5mm), is the air box stock and unmodified, is it still a 50cc bore, and is the exhaust stock? With more information about your bike I can help you with the proper combination of parts and set-up.--vh286
> I just bought a demo Derbi from a shady dealer. AFter I
> bought it I found out my rear wheel was bent!! Also the
> scooter's throttle to power is not very smooth it seems.
> But maybe it's normal; I'm not sure.
>
> Here is my question. Is the GP1 suppose to be a high
> revving scooter? Meaning it has no low end torque but
> rather power is only at the top at half to full throttle?
> Because when I apply 1/4 throttle, the scooter just doesn't
> move at all but the engine is already revving loudly. I
> have to apply thus more throttle before the scooter would
> start moving. My GP1 seems to only want to be ridden at 3/4
> or full throttle before it runs smooth. If I keep it
> consistant at like 20/30km the bike doesn't run too
> smoothly. Also the GP1 is so loud. Is this NORMAL?? I have
> a feeling something is wrong with my GP1, perhaps the
> transmission is unhealthy. But on the other hand, maybe
> that's how the GP1 rides because afterall it is a sport
> scooter and people race them. If anyone can share how
> their GP1 rides please, PLEASE let me know so I can feel
> better. BTW my GP1 is a 2003 model.
>
> thank you in advance
> Kendrick
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