Carb,air filter?if it is only downhill maybe the chain can't keep up since you are at max.auto clutch?that's something different.good luck.
Testimonial: "Thanks very much for this. Looks like this scooter is not meant to go over 100 km/hr (downhill). I have a short section of freeway when commuting - better avoid it"
after further looking at some manuals i would say you are exceeding the auto clutch limits.
to make this a little clearer...here you go.when you are at max throttle/top gear,auto clutch kicks in looking for a higher gear.since there is none it goes back to highest gear creating jerking.during this very little period of time,extra gas goes into the carb while autoclutch is looking for gear.when it kicks back in the extra fuel causes misfire as it is too rich of a mixture.you really need to try to avoid doing this as it could easily blow a hole in your piston.i have seen it before.just throttle down a little.
Why my bike jerking and slow when moving off??
is it spark plug out of spark or belting?
anyone pls help on this
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You have a rev limiter that kicks in around this speed. It can be disabled. Check rhe kymco forum in a couple days I will be posting on this subject
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