Carb I can start the scooter it runs. but wont idle. the idle is low. how to adjust the carb.

Carb is set too lean.

diapharm is bad in carb

my 50cc scooter will idle at first and rev very well but wont idle what can this be

Hi, if you have the lever in start that means the carb is choked. If you are only able to run the engine when the choke is on, then it is starving for fuel. First, make absolutely sure you have the right fuel mixture, then try to start the engine. If the mix is correct, then your carb is out of adjustment. Find the two screws that adjust the high and low idle on the carb. Turn the low idle one quarter turn counter clockwise and try to start the engine again. This adjustment will allow for more fuel to deliver into the cylinder. (adjust more if needed). The high idle may also be out of adjustment, so tune this screw with the throttle on high (and running) until you hear the transition between the high rumbling sound and the high even sound this point is you high idle. Good luck

There should be a idle screw adjustment on carb.if not try adjusting the low speed jet.

Most carbs have the adjustment removed (EPA) but if yours still has the adjusting screws here are the seat of the pants methods:

One Screw Carb: Turn it all the way in and then back out 3-1/2 turns, start the engine and make slight turns in or out until the motor runs smooth from idle to wide open, do not get it too lean, turn in until max RPM is reached then turn out 1/8 turn and go from there.

Two Screw Carb: You adjust the one to remedy either the low or high, high is adjusted until the motor runs smoothly under load at high RPM and the low is adjusted until idle and off idle is smooth.

Very good thought process on the adjustments. The throttle screw sets the idle speed and the air screw sets the fuel mix at idle speed. The stock setting is 1.5 turns outward. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward.

From this point you adjust the idle speed then adjust the air screw for fastest idle speed at that throttle screw setting. If the idle speed becomes faster than desired after adjustment, just reset the throttle screw and then reset the air screw.

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set you carb adjustments at 1 1/4 and try that