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Keihin Carb Jetting Chart

Keihin Carb Jetting Chart - To visualize how the various circuits overlap, please refer to the jetting chart. Always remember to change one carburetor component at a time and keep a record of your changes. Web this url below links to my free spreadsheet for decoding keihin needles and finding another needle to buy. Web this keihin jetting guide is now available to everyone and is unlike any before. Bike stock with pipe and race gas, i live in california, sea level. The needle is broken into 3 main functions; Shown in the above diagram and below on the mikuni catalog pages are the operational ranges that the different jetting systems (main jet, jet needle, needle jet, throttle valve, and pilot system) work in relation to the throttle slide. Measure the height from the bottom of the float to the throttle opening. In the following paragraphs i will explain the needles functions and how to adjust them. Web the jet needle is the most important component in determining your carburetors jetting.

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Below Is A Screenshot Of My Spreadsheet For Keihin Carbs (Pwk, Pj, Pe).

The following information is offered as a guide for a practical interpretation of the workings of keihin pe, pj, pwm and pwk carburetors. Always remember to change one carburetor component at a time and keep a record of your changes. Many thanks to marc salvisberg, founder of factory pro tuning, for teaching me the finer points of using dynamometers and tuning carburetor equipped engines. These needle functions have a large effect on the carburetors jetting from ¼ to ¾ throttle.

Web Keihin Fcr Tuning Manual Version 3.3.

Many people are intimidated by carburetion jetting. Web keihin jet identification chart. The excel spreadsheet uses tables within the program to graph the needle profile (diameter) at the nozzle and show the relative change in. But there are subtle differences between these carbs.

The Genuine Mikuni Public Release (A.k.a.

You can see as altitude increases, jetting gets leaner but for the same altitude, as the temperature gets colder, jetting gets richer. All our jet numbers are the correct numbers. Anyone out there have a keihin 38 pwk in their cr125? Perform the jetting in the order given below.

Zero Throttle Operation (Idle Circuit) Idle Screw:

Do not mix our jets with aftermarket jets from a used parts bin or other manufacturers, doing so will waste time, result in poor jetting results and lead to frustration. Web jetting range effectiveness chart. Measure the height from the bottom of the float to the throttle opening. Click here for my page verifying the jetting calculator for keihin pwk/ pj/ pe carbs.

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