JCL MP250A Runs Poorly 0-40 MPH & No Front Brakes By bob123456789 (Read 3,980 times)

[thecableguy]

Hopefully someone more knowledgeable on the carbs can chime in.

If the CVT is not clanking any more I think you've got that problem solved...

[bob123456789]

Here is some background on the carb A/F screw.

This is the procedure I was attempting to follow.

scooterdoc.proboards.com/thread/1499/4ts-carb-tuning

The screw is brutal to get to. It is on the bottom of the carb. The only way I could get to it on the right side was to lay down on my back reaching on top of the hot muffler and block. I could just barely reach it that way. There is no adjusting it while it is running so I was modifying the procedure so that after each adjustment I let it warm up again before I checked the idle speed.

I moved the screw a significant amount in one direction and did not find any noticeable change in my rpm.

Right now it is idling at approximately 1,000 rpm.




Below is a picure of my carb in general:



Here is a picture of my specific carb:



So What should my next steps be?

[bob123456789]

In these picture is there supposed to be anything connected at A, B or C?

[thecableguy]

Unfortunately I'm not familiar with that carb. If you don't get someone else jumping in to help, I'd start another thread specifically asking for help on the carb issue.

Good Luck!!
Jim

[bob123456789]

From this reference picture of the other side of the carb (not my actual carb) it looks like nothing should be connected to A, B or C.



Does anyone know an easier way to reach the A/F screw other than going in on the right side over the hot muffler?