2008 Robot (actually Jonway YY50QT-T20)

[kalidasa]

I still have a problem - even after turning OUT the mixture screw on the carburettor:

1. When the vehicle is on the stand and I turn the throttle full, the RPM goes to 6000-8000RPM.
2. However, when I sit and drive it around the parking lot, the max RPM is no more than 5000 RPM and it rises and falls. I have the throttle turned FULL and I get the semblance that it may pick up and go more than 15-20MPH (ie 5000RPM), it does not.

Any pointers, please?

[Firehawk989]

Originally Posted by kalidasa

I still have a problem - even after turning OUT the mixture screw on the carburettor:

1. When the vehicle is on the stand and I turn the throttle full, the RPM goes to 6000-8000RPM.
2. However, when I sit and drive it around the parking lot, the max RPM is no more than 5000 RPM and it rises and falls. I have the throttle turned FULL and I get the semblance that it may pick up and go more than 15-20MPH (ie 5000RPM), it does not.

Any pointers, please?

Probably shouldn't have messed with your mixture screw. Turn it in all the way and then turn out around 1 and 1/4 turns for the stock setting. (I think!)

From there turn it small amounts one way or the other and test it each time. Eventually you will find where it runs best.