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Post by Critter from the Rock on Oct 28, 2018 11:47:13 GMT -5
Keihin carburetors for the scooters, my question is Does all these carburetors have a clip or screw that holds down the needle under the large diaphragm and spring? The one that goes down and closes off the main jet? It has a white cap sitting on top of the needle then the spring but it is not secured to the plastic plunger that the needle goes through, it's just that white cap and spring holding it down in there. I'm just wondering if it was possible that I lost the clip or something there that holds it?
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Post by scooterpimp on Oct 28, 2018 12:09:36 GMT -5
There is a e clip on needle , that has a washer,clip or spacer that sits on e clip & spring holds it down.
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Post by Critter from the Rock on Oct 28, 2018 18:50:26 GMT -5
Ok, so the needle is not secured to the bottom plastic piece permanently, and can move with the sping Up and Down, Not necessarily the exact movements of the black plastic cylinder?
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Post by 90GTVert on Oct 30, 2018 4:31:22 GMT -5
Nothing usually totally locks the needle into the slide (that black plastic cylinder). It is pretty well bound to the movement of the slide because of the spring pressure though.
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Post by Critter from the Rock on Oct 30, 2018 6:10:17 GMT -5
Ok , Thanks so much for your knowledge. I'm trying to figure it all out. I'm thinking that my not having the petcock on bike may be letting fuel into the oil. But the issue of the air mixture screw having to be turned all the way down seems to still have me stumbled. Unless the gas is over filling and going up the main jet,, or could be the auto enricher not seating??
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Post by 90GTVert on Oct 30, 2018 9:09:12 GMT -5
IF you are having overflow issues, that should be because of the float height or a sealing issue around the float needle and seat. Fuel supply should be able to be left on without constant overflowing if all of that is right. Still a good idea to at least have a manual fuel shutoff though. If float height is too high, it really richens up the low end of the throttle.
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Post by GrumpyUnk on Nov 4, 2018 13:00:36 GMT -5
If the pilot jet is too large, it will flow too much fuel at idle, making it hard to start, and also making it so you have to open the throttle butterfly more to have it idle at all.
Check your pilot jet size.
You can also check the float valve while you have the carburetor out. Invert the carburetor so the float is on top. Attach a length of hose to the fuel inlet port. Blow through the hose. You should not be able to blow anything through. Flip the carb upright, and the float will 'drop', allowing the needle to unseat, and you should be able to blow through the tubing. If you can blow through with the float on top, the needle & seating area should be inspected. You could have a worn(grooved) needle(rubber part), and replacement is the only option.
If the needle valve leaks, you'll get too much fuel in the float bowl, and it may cause very rich fuel mix, where you have to almost close the adjusting needle just to get the thing to run. Worth checking while you are inspecting the pilot jet size.
tom
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