Pilot Jets for Keihin Carbs

Part Number
N424-21-0**
Grouped product items
Product Name Price Qty
35 Pilot Jet for Keihin PWK
7 in stock
£5.49
38 Pilot Jet for Keihin PWK
5 in stock
£5.49
40 Pilot Jet for Keihin PWK
7 in stock
£5.49
42 Pilot Jet for Keihin PWK
11 in stock
£5.49
45 Pilot Jet for Keihin PWK
1 in stock
£5.49
48 Pilot Jet for Keihin PWK
0 in stock - Available to order
£5.49
50 Pilot Jet for Keihin PWK
4 in stock
£5.49
52 Pilot Jet for Keihin PWK
0 in stock - Available to order
£5.49
55 Pilot Jet for Keihin PWK
11 in stock
£5.49
The pilot jet mainly changes the mixture from tick over to around half throttle. Available in Sizes 38 to 80.

Fits CR, FCR, PJ, PWK, PWM, PE, PD Keihin Carbs.

5.0mm Slot head
28mm Length
M6 x 0.75 Thread

The number of the pilot jet indicates the size of the hole (highest is the largest/richest).
Too rich a mixture will give a lumpy idle (popping exhaust note), too lean a mixture will cause bogging on quick throttle openings and a zingy sound (like a smaller cc bike) when running.
The air screw can be used to perfect the mixture setting, if the air screw is less than half a turn out from full in, usually a larger jet is required and if the air screw is more than one and a half turns out from full in a size smaller jet is required.

Part numbers:

SizeKeihin Part NoSherco Part NoBeta Part No
38 N424-21-038   1642355 000
40 N424-21-040  
42 N424-21-042 1403 1642347 000
45 N424-21-045 1336 1642349 000
48 N424-21-048 1339 1642348 000
50 N424-21-050 1327 1642344 000
52 N424-21-052 1337 1642358 000
55 N424-21-055 1338 1642359 000
More Information
Manufacturer Keihin
Sherco Part Code 1327, 1336, 1337, 1338, 1339, 1403
Beta Part Code 1642355 000, 1642347 000, 1642349 000, 1642348 000, 1642344 000, 1642358 000, 1642359 000
Year 2007, 2008, 2009
Model 320
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