Idle Mixture...im confused?

[partyboy]

Hi rebels
im kinda confused? here are the questions::

1. if im aiming for the highest rpms, why would the normal idle be 2000 rpms?

2. what is the normal rpms? ive heard 1,500 to 2000 rpms while idle

3. just to confirm, what does 'idle' mean? to me its when you are standing still with the motor on right?

4. if i totally unscrew my idle SPEED screw, (which is the other screw) and my rpms do not go down further than 2000 rpms, is something wrong?

5. which way is rich and which way is lean, does it depend on the type of carb? someone told me if its on the outlet side its a fuel screw and if its on the inlet side its a air screw?

[Rebel]

A couple answers for you. Idle is the rpms the motor runs at when it is standing still and the throttle is at rest position. On these scooters you want that to be aspeed just slower than the rpms needed to make the rear wheel move. Idle would be adjusted with a screw near the throttle cable end at the carb. A adjusting scre that goes into the body of the carb will be a air fuel ratio adjustment screw.

[craisin]

Apr 22, 2014 20:25:20 GMT -5 partyboy said:

Hi rebels
im kinda confused? here are the questions::

1. if im aiming for the highest rpms, why would the normal idle be 2000 rpms?

2. what is the normal rpms? ive heard 1,500 to 2000 rpms while idle

3. just to confirm, what does 'idle' mean? to me its when you are standing still with the motor on right?

4. if i totally unscrew my idle SPEED screw, (which is the other screw) and my rpms do not go down further than 2000 rpms, is something wrong?

5. which way is rich and which way is lean, does it depend on the type of carb? someone told me if its on the outlet side its a fuel screw and if its on the inlet side its a air screw?

High idle could indicate a vaccumn leak.
Depending on the card some the mixture screw meters air and some meter gas
If it meter air you screw it out or counter clockwise to lean it.
If it meters gas its opposite clockwise for leaner but thats just the Pilot system.

Then you have the main system which can be altered by raising or lowering the needle and/or swapping the main jet.

Also the float height effects transition from the Pilot system to main too low and you will get a lag or hesitation in acceleration,too high you get overfueling

[partyboy]

***Update*** issue was resolved with a new carb and proper speed & mixture screws alignment, i have other threads that are based on this issue, thought i should update this thread for fellow members that are experiencing the same problem.