Tuesday, 30 November, 2021

Stock Sportster Carburetor Jet Sizes


sportster-stock-Carburetor-jet-sizes

If you’re wondering what the Stock Sportster Carburetor Jet Sizes are, you’ve found the answer! This page will cover the Sportster’s stock jet sizes for both main and pilot jets for the Keihin CV carb, AKA the CV40.

Harley-CV-Carb-Cutaway
# Part
1. Slide Spring
2. Slide Diaphragm
3. Vacuum Slide
4. Vacuum Port
5. Needle Jet
6. Main Air Jet
7. Main Jet
8. Slow Jet
9. Idle Mixture Adjustment Screw
10. Throttle Butterfly

Harley CV Carb History

Introduced in 1988 on Sportster models to replace the Keihin “butterfly” carburetor, the CV also from Keihin introduced a vacuum actuated slide and needle to regulate fuel delivery. As engine loads change the slide moves up or down allowing the suspended needle to meter fuel passing around it from a nozzle (needle jet). This innovative fuel metering system not only handles the air/fuel mixture throughout the mid range, but also provides a constantly changing venturi or throat size, hence the name CV or constant velocity.

The original CV carburetor in 1988 lacked an accelerator pump commonly used on most carburetors. To compensate for the lack of an accelerator pump and to eliminate lean flat spots, the factory produced the N65C needle whose length, diameter, and taper positions were designed to alleviate the off idle hesitation.

In 1989 an accelerator pump was added to the CV carburetor as all other models began to adopt the new carburetor, and the CV carb remained virtually unchanged until retired in 2006.

Stock Sportster Carburetor Jet Sizes

Main Jet:

Year Engine Jet Size CA Models
1988 883 170 165
1988 1200 200 180
1989 – 1991 883 175 155
1989 – 1991 1200 175 160
1992 – 1994 883 160 160
1992 – 1994 1200 170 170
1995 – 2004 883 160 170
1995 – 2004 1200 170 185
1998 – 1999 1200S 195 195
2005 – 2006 883 175 180
2005 – 2006 1200 180 185

Pilot Jet:

Year Engine Jet Size CA Models
1988 883 35 35
1988 1200 35 35
1989 – 1991 883 45 42
1989 – 1991 1200 45 42
1992 – 1995 883 40 40
1992 – 1995 1200 40 40
1996 – 2006 883 42 42
1996 – 2006 1200 42 42

Interested in more Harley CV Carb Tuning information? Check out some of our other articles!

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