Dirtdame said:I did not mention the air adjustment screw because on this model of Mikuni, there is no air adjustment screw. You have to get the idle circuit set by replacing pilot jets.
The slide was set way high on on the bad carb (both are 3.0), so high that there was no more adjustment left in the idle screw, but it still would not idle.
sr5bidder said:did you lower the slide setting then?
dirt bike dave said:In theory, that would make it even more rich.
FWIW, I also suspect the carb body is bad. Never heard of it on a KDX, but I've hard some years of RM250 had a carb that, over time, would get microscopic cracks in the bottom of the venturi, that would allow fuel to get sucked in from the float bowl. This was a devil to diagnose and only curable with a new carb body.
I guess you could transfer all the parts (slide, everything) from your good carb to the bad carb, and test. If it still runs badly, then you know it has to be the carb body.
That's what I was afraid of, too. :uh: I guess I'll be looking for another carb on e-bay (unless somebody here has one), because I'm not going to toss the good carb back and forth between bikes.dirt bike dave said:FWIW, I also suspect the carb body is bad.
I have another needle jet that is one size leaner than stock (that I got for high altitude applications). If anything could be the culprit that wasn't the carb body itself, that would be the most likely suspect. If I were to put that spare needle jet in and the bike cleaned up, i would just need to get a new R-2 needle jet. I hope that it will be just that easy. Probably check that out today or tomorrow.dirt bike dave said:I guess you could transfer all the parts (slide, everything) from your good carb to the bad carb, and test. If it still runs badly, then you know it has to be the carb body.
The float valve/needle set was replaced and manually and visually checked for the proper operation with the carburetor installed on the machine with the float bowl removed.glad2ride said:How is the float valve on the old carb? Is it letting too much fuel into the bowl?
Congratulations on getting another '86! Is it called Bentley's Buddy? :-)
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