This kit replaces the stock accelerator pump cover, diaphragm, plunger rod, spring and o-rings. This is the updated '08 version for better off-idle performance.
NOTE: For those models with the check valve in the float bowl you'll need to remove this or reuse your original accelerator pump cover. CRF's Only exclusive how-to will show you how to install this kit. Click Here For CRF150R installations you will not install the included plunger rod.
I installed this updated kit on my 05 450x. I had the off idle bog/hesitation with the bike which was annoying and made the bike difficult to ride. I installed this kit along with a JD jet kit and leak jet kit and Merge racing ap spring and CRF Only fuel screw. The bog is gone, replaced with instant and smooth throttle response. Makes the bike more fun and easier to ride, especially in the low speed stuf
Fits the items below
Click/tap each year button to see the bikes that fit:
