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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 82 10.50%
#45 slow 496 63.51%
#48 slow 129 16.52%
#165 main 32 4.10%
#170 main 115 14.72%
#175 main 162 20.74%
#180 main 232 29.71%
#185 main 95 12.16%
#190 main 64 8.19%
Yes my needle is shimmed 151 19.33%
No my needle is not shimmed 243 31.11%
Other, explain. 82 10.50%
Multiple Choice Poll. Voters: 781. You may not vote on this poll

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  #241  
Old 19th September 2017
frankjc frankjc is offline
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Sportster/Buell Model: 883
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I put a 44 slow jet in, no more cough.
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  #242  
Old 19th September 2017
gpydeski gpydeski is offline
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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
David L. David L. is offline
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Join Date: Apr 2018
Location: OKC
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Sportster/Buell Model: XLH
Sportster/Buell Year: 1974
Sportster/Buell Model #2: XLH1200C
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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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60Gunner 60Gunner is offline
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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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  #246  
Old 26th August 2020
Thack Thack is offline
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Sportster/Buell Model: XLH1200
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89 Sportster 1200 conversion. SE pipes with torque baffles and K&N air filter. 45/175 and no needle shim. Runs well with little warm up time.
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  #247  
Old 4 Days Ago
84rzv500r 84rzv500r is offline
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99 1200 S soon to be a 99 1275 S I dont remember what the jets are it did have SE Ignition box, SE staggered duals and a SE K&N fllter and a dyno jet Kit with a grooved needle when i bought the bike... I changed to a Cone Engineering 2:1 when the original pipes rotted off... I did have to raise the needle half a groove IIRC to take the lean spot out of lower midrange the 2:1 created. runs good its a touch rich through the range but ok with dark tan pipe color in the hot weather down here... I'll start a notebook when i do the 1275 as I will have to do some timing and Jetting changes for sure...
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1999 XL 1200 Sport RX, SE 7500 ignition, SE air filter, DynoJet, K&N, Cone Engineering 2:1 pipe, Storz Steering damper, with 2012 XR1200X perf forks, 3.5 x18" wheels front and rear, Galfer stainless lines, XR1200 4 piston front calipers, 18" Dunlop D404 130/70 and Dunlop trailmax mission 140/80-18 rear XR1200X perf shocks, 19/48 530 chain conversion, Dart Flyscreen, Antigravity LiFePO4 battery

1983 XR-1000S to XR-1000RX Project Build Thread
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