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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 28th October 2009
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Default 1990 CV carb rebuild question -- what the heck???


Okay, so the manual says to back out the main jet and the needle jet holder. I have done that, they are resting on the right side of the body and in the float bowl in the pic. Manual then says:

"Needle jet is free to be removed from bottom end of passage."
But I have a brass rod in the way (red arrow). What the heck? I gently grabbed the rod with needle nose pliers, and very gently pulled, but got nothing.

Can someone please explain what is going on? I don't see that brass rod in any diagrams. Is it supposed to be part of the needle jet holder? Should I get more aggressive with the needle nose pliers? And if I pull the rod out, I still don't see any screwdriver slots at the bottom of the bore to back the needle jet out with.
Thanks.
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Old 28th October 2009
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The mid-range metering needle comes out from the top. the top of the carb where the vacuum piston (slide) is located needs removed. you will find a spring setting on a little plastic piece on top of the needle, however when the slide comes up the needle will too. also under the carb is a low speed adjustment needle, its behind a plug. (some drill the plug out so it can be adjusted)
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Last edited by xHDrider; 28th October 2009 at 21:07..
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Old 28th October 2009
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See if this helps
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Old 28th October 2009
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and another
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Old 28th October 2009
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Okay, I'm an idiot, thanks to both of you for the help.
One last little question.
In kdarejr's diagram, part #7, the "jet needle" -- right where the little #7 pointer thing is pointing to it near the top -- there is a c-clip with three tiny washers or shims stacked on top. Does that sound like stock? Or do you think someone has added washers? There are 6 possible little grooves that the c-clip could be fitted into. It seems like the c-clip could have just been moved up a grrove, and a couple of the shim washers could have been eliminated.
Thanks
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Old 28th October 2009
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Quote:
Originally Posted by DogBunny View Post
Okay, I'm an idiot, thanks to both of you for the help.
One last little question.
In kdarejr's diagram, part #7, the "jet needle" -- right where the little #7 pointer thing is pointing to it near the top -- there is a c-clip with three tiny washers or shims stacked on top. Does that sound like stock? Or do you think someone has added washers? There are 6 possible little grooves that the c-clip could be fitted into. It seems like the c-clip could have just been moved up a grrove, and a couple of the shim washers could have been eliminated.
Thanks
mine didn't have the clip option. some shim up the style I have, I didn't choose to.
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Old 28th October 2009
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Thanks.
Final (hopefully) question:
Under the accelerator pump nozzle -- # 42 in kdarejr's pic -- there is an o-ring, part #45. The Clymer manual says to remove, clean, and blow out the nozzle. How do you remove the accelerator pump nozzle to do that and to replace the o-ring? I have tried unscrewing it, and just pulling it straight out. I'm about to damage it.
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Old 28th October 2009
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I am not aware of any stock CV carbs coming with and adjustable needle so your needle is likely aftermarket. If they did that then they likley drilled the slide hole a little larger and put in a lighter spring on the diaphram. You may want to look at the needle carefully for wear in the midrange as many aftermarket needles wear quickly. What was the reason for the carb R&R?
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Old 28th October 2009
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The reasons for the r&r were a cracked plastic fuel inlet elbow -- that requires removing the carb from the bike -- and gas leaking from the float bowl overflow tube. I found no dirt under the float needle valve, but the rubber looked worn. Maybe it's the float level. That's all -- I figured as long as I had the carb off, I'd re-build it -- the bike has done lots of sitting for the last three years.

Any one know how to remove the accelerator pump nozzle?
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  #10  
Old 28th October 2009
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if your talking about the pump spray nozzle, I have never removed mine. some people turn them, I checked my spray direction and did not turn it, if you did turn it make sure its directed right down the middle of the carb toward the bottom of the butterfly.

The pump rod will slide back into the pump body and boot easily or the re-assemble. don't take more then you have to apart. keep every thing clean. use compressed air to check passages.
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