SOURCE: 1978 Honda Goldwing GL 1000 is stalling and running in 3 cylinder
I know this one FOR SURE!!! Killed me for days-- my mileage was HORRIBLE, and the #2 manifold was ICE cold while the other three were nice and warm. A multiple step solution ultimately got it going again, and I was thrilled finally.
Yes, the plug is fouling out---too much fuel. Idle mixture screw is useless for this issue, return to factory spot and later set Idle proper after the carb float has been adjusted. Gotta take the carbs off for this, although not completely apart. Get the group of 4 out (lotsa tricks to do this easily, otherwise, get ready for some frustrations in taking them off--lotsa hair pulling, etc.
The adjustment of the floats in the individual carb needs to be set exact. 1/2mm high or 1/2mm too low=noticeable difference either super lean or super rich.
To confirm the fouling, after riding for 10 minutes or so, just reach down and feel that exhaust manifold. It'll be ice cold with it's pushing all the fuel past this carb. My The other firing cylinders will have these manifolds warm/hot to the touch. When this occurs, pop the plug out--you'll get a lot of gas since the fuel is leaking right down in the cylinder at an amazing rate (far faster than the running carbs consume fuel. You're oil may also be tainted now with good bit of gas mixed in.
SOURCE: bike wont start
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Clean the air filter. Install a new stock NGK spark plug.
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SOURCE: I have a91 xr250l w/ a pumper carb. Will not start.
It's a '91 model. When is the last time you had the carb cleaned out? Sounds like you've got a stopped up low speed jet. The hole in that jet is less than 0.020" in diameter. Doesn't take much to obstruct that. Do you run a fuel filter in your fuel line? I'd pull the carb and take the float bowl off. You'll see a large jet directly in the middle of the carb. Just off to the side, you should see another small jet. This is the low speed jet. Take it out and clean the jet using aerosol carb cleaner. Do not stick any wire or anything through the jet. You should be able to hold it up the the light see through it. Set you idle mixture screw at one turn off the bottom to begin with. Once you get the engine running and warmed up, adjust for highest smoothest idle speed. Good Luck
SOURCE: 1985 xl250r honda road/trail twin carby
There is only a manual for an XR250 but it may have the information you need. Go to http://www.carlsalter.com/motorcycle-manuals.asp , and download a (free) manual.
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