Derbi 49cc 2000 rpm not going above 1000

GamersAhoy

Well-Known Member
Hi i have a question,

i have a derbi SDR 49 cc year 2000, and it sparks... no problem with the fuel, so it starts,

But the second i give gas throttle, i hear the carburator giving more air and fuel flows. but the rmp does not go higher, and yes it eats fuel and flows nicely.

Yes, the Floating up and down with the needle in the carburator works perfectly.

There are no air leaks or fuel or oil leaks. These are all checked by propane, refreshing the fuel and oil.

When starting the bike, it runs and stays running. From the moment i give throttle in neutral. the rpm goes a little bit higher +-5 %. So i really dont know what the problem is. because the bike Runs.

Clutch is working perfectly fine. all 5 gears

Here is the video:

Any suggestions? im going crazy.
 
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it sounds to me like you have...

or a ignition problem, sounds like it could be the timing..

or you have set the fuel mix way to skinny, in which case you need a bigger gasoline nozzle/sprinkler (lol)
 
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