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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 2nd August 2021
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Default Idle speed screw thread size

What please is the thread size of the CV idle speed adjustment screw?

Mine just left to join all it's cousins in the dark recesses of my shop.
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  #2  
Old 3rd August 2021
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Seems to be metric, maybe a M4 or M6 , just go to hardware store a purchase some, they are cheap... then come back and tell us what size it is, because I searched the internet all around for it and there is no info about it, only the part number P-N 27130-90

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  #3  
Old 3rd August 2021
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If you are talking about the idle screw (not idle mixture) I haven't found it yet.
I measured mine at .154" with a 36 TPI (36 matches to a #8 screw)
But the standard OD on a #8 is .164".
I don't have a metric scale but converting I get 3.9116mm.
So I don't have an answer, just relaying what I measured.
But the carb was made in Japan, most likely metric.
I'd try a M4 x 0.7 (standard OD is .157")
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Old 3rd August 2021
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Seems we came to about the same conclusion.
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Old 3rd August 2021
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It's definitely an M4. I replaced mine with a stainless steel one. I used a 25mm cheesehead screw, and shortened it to 21½mm long.

That's metric coarse thread: 0.7mm pitch.
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Old 5th August 2021
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Default

Scrounging through some parts drawers I found an extended adjuster screw
and never did bother measuring so still don't know what size it is. .
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Quote:
Originally Posted by Folkie View Post
It's definitely an M4. I replaced mine with a stainless steel one. I used a 25mm cheesehead screw, and shortened it to 21½mm long.

That's metric coarse thread: 0.7mm pitch.
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Quote:
Originally Posted by LenC View Post
still don't know what size it is. .
It's the size I said it is.
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