I'd check the drive belt if the engine seems to be running ok. If the belt is weak, it can stretch and will affect speed. Also check the variator and torque driver.
> >
> > Please help, my son has a derbi gp1, it looses power
> after
> > a while ( drops down to 10 mph from normal)when he stops
> it
> > restarts its ok for a while then does it again, we have
> > replaced the fuel tap cleaned the carb out, new inlet
> > manifold, new cdi unit with plug and cap, new regulator,
> > also put an anti-freezing agent in the fuel because its
> > been cold recently. Could anybody help.
> >
> > Thanks
>
> Try cleaning the exhaust or replacing the exhaust pipe.
> rscooter_55@yahoo.com
> owner of GP1
> I'm looking for body parts for mine if anyone has any
> connections
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