Get XiED(tm)!
Nightrider.com Performance Parts

Don't let the Harley heat monster ruin your riding.
Reduce  Engine Surging
Improve Throttle Response
Reduce Engine Ping

 

HD 2007/2008 Engines

High Heat on 2007/08 HD engines

HD 2007/08 Performance Recommendations

Cool your exhaust temperature with the Wide Band O2 upgrade for 2007/08 HD

Harley Camshaft Specification Tables

HD Twin Cam Engine Builds
TC 128 HP 95 CID
TC 100HP Street Engine

The basics of Fuel Injection explained

DEWEY'S CUSTOM
Rammer Performance Air Cleaners
TC Performance Heads 100+HP

Pro Tuning on a Shade Tree Budget

   

Keihin CV Carburetor Part Numbers
Jets and Needles

Here is a list of Harley-Davidson part numbers for Jet Needles, Pilot Jets and Main Jets that can be used in tuning the Keihin CV carburetor.
Jet Needle
Part Number
Jet Needle  
27175-90
27176-90
27178-90
27179-90
27184-92
27186-92
27280-92
N72R
(CA Only)
N72S
(CA Only)
N86F
N86E
(CA Only)
Rich
V
V
V
V
V
Lean
27094-88 1988 1200 Sportster  
Pilot Jet
Part Number
(Slow Jet)
Jet Size  
27165-90
27170-89
27171-89
27281-92
27117-88
48
45
42
40
35
Rich
V
V
V
Lean
Main Jet
Part Number
(High Speed)
Jet Size  
27105-88
27185-90
27114-88
27090-89
27115-88
27116-88
27152-89
27154-89
200
185
180
175
170
165
160
155
Rich
V
V
V
V
V
V
Lean

Other Useful Parts

If you misplace the idle mixture screw in your Keihin CV carburetor, there are actually two different sources for replacement parts.

Copy of creative_cycle_needle00.jpg (2496 bytes)

This idle mixture needles for CV and butterfly Keihin carburetors allow easy adjustment of the idle mixture. It is a direct replacement of the OEM needle. The knurled adjustment knob makes setting the idle mixture a snap.
For more information visit the Johns Motorcycle Parts site.

Bike Tech has found this to be a handy little part to put on a CV carburetor. Installation of this idle mixture needle is simple. Just remove the old needle, making sure the spring and O-ring are removed along with the it. Place the O-ring and spring on the JMP Idle Mixture Screw and place it in the carburetor. Making idle mixture adjustments can now be easily made while the engine running and without needing a screwdriver.

creative_cycle_elbow01.gif (6152 bytes)

H-D has used Keihin butterfly and CV type carburetors since 1976. The same injection molded fuel inlet elbow is installed on both types. The OEM elbow breaks easily, can be affected by today's fuels and has a restrictive flow rate. Johns Motorcycle Parts fuel inlet elbow is made from brass and flows 40% more fuel. The increased flow easily keeps up with the demand of a modified engine. The elbow is designed to be a direct replacement for the OEM item.

If you want to improve the throttle response from your OEM CV carburetor for about $3.00, replace the vacuum piston spring with the spring from the Screamin Eagle 44mm CV (part number 27728-99). Stock spring tension is 200/290 grams versus 130/210 for the new spring.

Provided by Dave Morse

The part number for the Screamin Eagle 44mm CV carburetor Tuner's Kit is #27419-99

Provided by Dave Morse

Your neighborhood Kawasaki dealer has parts for the CV-40 carburetor. Seems a 1997 Vulcan Classic 1500 uses the same carburetor as  Harley-Davidson.

Kawasaki Part Numbers are as follows:
Pilot Air Screw, Part # 16014-1082
Pilot Screw Plug, Part # 92066-1051


Threads messed up for the idle mixture screw?
In case someone uses a screwdriver that is a bit to wide and messes up the threads for the screw, a 6mm x .75 pitch tap will clean up the threads nicely. Make sure to ground the end of the tap flat so it does not damage the screw seat. (This information courtesy of Rich White)

 

Home
Table of Contents
Search the site 
Nightrider COPYRIGHT

Ask us a Question

Modification, Installation, Maintenance and Tuning Index  will help you find most of the information you want on one page.

How to get Professional Tuning Results at home
Testing the Innovate Motorsport LM-1 portable air fuel meter

Profession Tuning on a Shade Tree Budget

Veypor VR2 Data Logger and Instrument Panel
Video Installation and Demo
Purchase VR2


Engine Performance
How to Build a
TC96 2007 Engines
TC88 70HP Stage1  
TC95 128HP Stage 3
TC95 100HP Street
 
TC96 2007 Stage 1/2
EVO 64 HP Stage 1
EVO 74 HP Stage 2
EVO 82 HP Stage 3
EVO 95 HP Stage 3
883 to 1200 Upgrade
Shovelhead Modifications

New EFI for EVO and TC

Performance Gallery
Horsepower Gallery
Evolution 80
Shovelhead
Sportster
Twin Cam 88/95
Evolution Unlimited
Sportster Unlimited
Drag Strip Gallery
Land Speed Racing Gallery
CV Carburetor
Modifying the CV carb
Tuning a CV carb
Camshafts
Selecting a cam
Install a TC 88/95 cam
Install a Big Twin cam
Install Sportster cams

Camshaft Specifications
Twin Cam
EVO
Shovel
XL


Exhaust Systems
EVO Exhaust Testing
TC Exhaust Testing
Khrome Werks AR100 test
Making Drag Pipes Work

SHOP TALK
Shop Manual
Carburetor
Carburetor Troubleshooting
Exhaust
Ignition
Finding Manifold Leaks
Camshafts
Cylinder Heads
Pistons and Cylinders
Clutch
Belt Drive
Shop Manual Appendix
$20 Bike Lift
Plug Wires
Spark Plugs
Engine Tuning
Nitrous Oxide
Motor Oil
Stutter Box
General Information
WEB Links
Buy Books and Manuals
Miscellaneous
Performance Calculations
Estimate Horsepower
Estimate 1/4 Mile Time
Estimate Top Speed

Engine Displacement
Exhaust Length
Gear Ratios
MPH at RPM
Air Density

The Nightrider Diaries
The ramblings of a genius a, a madman and something in between.

Where is Sifton Cams?

Autocom Active-7 tested

Harley-Davidson EFI
-EFI basics explained
-EFI modifications explained

183 HP, 2 carbs, 2680cc

Copyright 1997-2006  Stephen Mullen, Oldsmar, FL -+-