GPR Camp: Replica Racers

Can someone tell me how to properly adjust my derbi senda 50 air screw mixture?Thanks.It is an 07 with stock carb

The basic way to adjust the air mixture is:

1 - set the idle a bit higher than normal. This is done to keep the engine from stalling during adjustment.

2 - turn the air mixture screw all the way in. This is so that you can count the number of turns out as a reference. Usually 1.5-2.5 turns out is about perfect, if it's not then the pilot jet may need replacement.

3 - with the engine running at idle turn out the air mixture screw a half turn at a time. Sometimes it takes a moment for the carb to settle. You are seeking when the engine runs at its highest idle while making changes to the air mixture screw.

4 - once you notice the idle going down turn the screw back in a half turn at a time back to the highest idle position. You may need to go back and forth a few times.

5 - once the setting is adjusted return the idle back to a normal range—usually around 1.5K-2K RPM.

6 - if the screw is either all the way in, or close to all the way out then the idle jet should be replaced with one that allows the screw to be in the 1.5-2.5 range.

Ok so some clarifications,by in you mean right and by out you mean left?and then by a turn you mean 360° and half a turn 180°?Just making sure

Yup you got it. A full turn is 360°, a half turn is 180°, in would be clockwise, and out would be counter clockwise.

English is rather difficult with procedures so away feel free to ask for clarification!