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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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View Poll Results: What jets do you typically use? Choose all that apply.
#42 slow 80 10.43%
#45 slow 488 63.62%
#48 slow 127 16.56%
#165 main 32 4.17%
#170 main 111 14.47%
#175 main 159 20.73%
#180 main 227 29.60%
#185 main 95 12.39%
#190 main 62 8.08%
Yes my needle is shimmed 147 19.17%
No my needle is not shimmed 239 31.16%
Other, explain. 82 10.69%
Multiple Choice Poll. Voters: 767. You may not vote on this poll

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  #241  
Old 19th September 2017
frankjc's Avatar
frankjc frankjc is offline
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Join Date: May 2010
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Sportster/Buell Model: 883
Sportster/Buell Year: 1988
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I put a 44 slow jet in, no more cough.
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88 sportster 883, 2001 motor, S&S shorty E carb, drag pipes.
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  #242  
Old 19th September 2017
gpydeski gpydeski is offline
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Sportster/Buell Model: xlch
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see now I changed to a 48 from a 45 and it seems to run more smooth. I think they say a shovel runs better when it is a little rich.
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  #243  
Old 26th September 2017
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60Gunner 60Gunner is offline
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Sportster/Buell Model: 1200/1250C
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Stock 42/180 with drags and a modified backplate on the stock AC. Darn near as good as some stage 1 ACs and leaves me the room to hide the breather mod.
All I changed in the carb was the needle to an N65C from an '88 XL. No need to rejet for most all stage 1 exhaust and intake upgrades.
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  #244  
Old 21st April 2018
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Sportster/Buell Model: XLH
Sportster/Buell Year: 1974
Sportster/Buell Model #2: XLH1200C
Sportster/Buell Year #2: 2002
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Other Motorcycle Year: 1975
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I can only speak to bikes around here on Oklahoma, and surrounding altitudes, but I almost ALWAYS leave the main alone, and go up one on the slow speed jet. So a 40 in an 883 gets a 42, and a 42 in a 1200 gets a 45.

People often don't think about the fact that when you richen the slow speed circuit, you richen everything, as it continues to pass fuel when the main comes on.

I actually seldom replace the 42. I just drill it with a Snap-On jet drill. I want to say that it is a number 117. I will go check out in the shop if anybody is interested.

When I do replace jets, I only use real Keihin jets. The aftermarket ones are not consistent.
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  #245  
Old 30th June 2018
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Seems I underestimated the performance of the Dragtron II AC with the K&N filter and was a little lean on wot so I stepped it up to a 185 main. Had a very occasional carb fart playing with the throttle with theclutch in too so so i put a 45 then a 46 pilot and it's dead on now.
So 46/185 and the N65C need from the '88 sportster .
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05 1200/1250C/Hammer 570 Cams/E1 clutch kit +15% spring
TC88A Gunner's V00D00 map/DCPR7E/Taylor Pro 8mm
S&S Premium Lifters/KhromeWerks HP Plus 3" slip ons
HSR42 25 pilot 2 turns Y8 needle jet 97 needle 2nd groove 170 main
Dragtron II AC K&N filter/VR1 20W50/Spectro 85wt Primary Oil
Max torque 87.7@4400rpm/max hp 86.8@5600rpm




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