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Old 06-07-2010, 07:57 PM   #33
One Less Harley OP
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Joined: Nov 2006
Location: Bowling Green, Ky
Oddometer: 4,834
I have been doing some jetting changes on the G/S, the bike was jetted with 135MJ/ 45 Idle jet needle position unknown, millage was OK, 42-44 on back roads under 75mph, but starting from cold was bad, as bike wanted to die when giving throttle until warmed up for about a minute.
here's a list of jets and MPG figures for the bike.

Note- I am not heavy on the throttle, and ride fairly sedate. Sometimes spirited but not extremely hard on it.

Stock Carb Settings
Main Jet 135 (150 stock, 130 stock for 1981)
Idle Jet 45 (45 stock for 1981,40 for 83-86)
needle Jet 266 (stock) , needle has about 15,000 miles
Needle clip 2nd from top (3rd stock)
Needle 46-241 (46-251 for 1981)

Main jetIdle JetSpeed/ConditionsNeedle Position from topMPGDate/notes



13545-753rd from top42-44choke not very effective

1504060-65 rainbottom41


1424055-603rd from top44.02

1424055-603rd from top45

1424055-603rd from top45


1st from top 38

2.68 needle jet, cold start BETTER
8/16/2012, plugs dark, runs great, slight hesitation at constant speed of 50plus

132...................45.......................... .......clip 3rd from top.......................2.68 needle spark plug and exhaust...good power (4/10/2014)
2004 BMW R1150RS
1984 BMW R80G/S
(wrenching index)
2003 Suzuki DRZ 400S (TAT Prep)
One More DRZ does the TAT (Ride Report)

One Less Harley screwed with this post 05-08-2014 at 07:20 PM
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