:KEIHIN CR Carburetor M Nozzle

By modifying the main nozzle shape, which is something that could be considered forbidden territory when tuning a carburetor, we have succeeded in dramatically improving atomization characteristics and response.
Installation is as easy as replacing a jet.

This is no longer the acceleration feeling of a CR carburetor.
In bench tests, we have confirmed that both torque and power output are improved, across the entire RPM range.

The "M Nozzle," which dramatically improves the performance of CR carburetors, has been so well received that 2,000 units have been delivered in the year and a half since its release, and has now been redesigned into a new version that delivers even better performance.

■Notes ※ Regarding the specified preset when M nozzle is installed
When installing the M nozzle, please preset as follows.
The connection between each jet is important when setting up, so half-hearted work such as reflecting only some of the settings below because you do not have the jet you need will not produce good results.

・CR35-39: 4-gang (Throttle valve cutaway size is 3.0)
MJ: 130-140
JN: 5178-5179
Clip position: 4th row from the top
SJ: 58-60
AS: 1 turn back

・CR35-39: Single (throttle valve cutaway size is 3.0)
MJ: 130-140
JN: 5173-5175
Clip position: 4th row from the top
SJ: 40-45 (with pilot outlet)
AS: 1 turn back

・CR33 (throttle valve cutaway size is 3.0)
MJ: 120-125
JN: YY6-YY7
Clip position: 6th row - 5th row from the top
SJ: 58-60 * 50-52 if pilot outlet is present
AS: 1 turn back

・CR31 (throttle valve cutaway size is 3.0)
MJ: 118-122
JN: YY6-YY7
Clip position: 6th row - 5th row from the top
SJ: 58-60 * 50-52 if pilot outlet is present
AS: 1 turn back

・CR31 (throttle valve cutaway size is 2.5)
MJ: 115-120
JN: YY6-YY7
Clip position: 6th row - 5th row from the top
SJ: 55-58 * 48-50 if pilot outlet is present
AS: 1 turn back

・CR29 (throttle valve cutaway size is 2.5)
MJ: 115-120
JN: YY6-YY7
Clip position: 6th row - 5th row from the top
SJ: 55-58 * 48-50 if pilot outlet is present
AS: 3/4 turn back - 1 turn

・CR26 (throttle valve cutaway size is 2.0)
MJ: 100
JN: YY7-YY8
Clip position: 6th row - 5th row from the top
SJ: 42-45 * 38-42 if pilot outlet is present
AS: 1/2-3/4 turn back

*Please note that product specifications may change due to manufacturer circumstances.