This is a genuine Keihin Accelerator pump upgrade Kit. Use what the pros did for the last 15 years of Fcrmx experience. 

 includes more than any other kit.

 a Keihin of Japan product. 

 will need to follow the step by step instructions to complete the kit.

Instructions-

 With the float bowl removed you can now remove stock accelerator pump rod with the updated rod. The updated rod is slightly longer than stock rod. The throttle pulley cover should already be off if you have removed the carb. If not, remove this cover to access the accelerator pump linkage. To remove the rod, extend the rod by rotating the accelerator pump linkage down. With the rod fully extended, firmly hold the end of the rod and pull it out. It can take more force than you think to pull the rod out as it "snaps" into the plastic rod linkage. This may also be a good time to consider replacing the stock linkage spring with the Merge Racing Accelerator Pump Spring. Install the updated accelerator pump rod in the same manner by rotating the rod linkage and pushing the rod into the linkage. You'll feel the rod snap into place. Remove the accelerator pump cover With the cover removed you'll see the diaphragm, spring, and check valve o-ring. Remove these from the float bowl. To use the updated accelerator pump cover you will need to remove the accelerator pump check valve in the float bowl. The updated cover has the check valve in the cover. In the photo below the screw is pointing to this check valve. This photo is of the check valve from the accelerator pump side The check valve consists of a bearing, spring and brass retaining plug Remove the check valve from the inside of the float bowl (bearing side) using a straight gauge punch no larger than the opening. Do not use a tapered punch as it will enlarge the opening as you drive out the check valve. With the check valve removed you can install the updated diaphragm with the pin facing up. Note the check valve has been removed. Install the check valve circuit o-ring. As you can see the new diaphragm has a much shorter pin. This shorter pin increases the pump duration. Install the d-ring in the updated accelerator pump cover. Install the new spring and the updated cover. I have taken this opportunity to replace the soft stock screws with stainless steel Allen screws. This will make it much easier in the future to service the carb. Complete the installation by reinstalling the float bowl, float bowl nut, pilot screw and overflow hose. 

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