The following is a detailed description of how to wire your Accelerator Pump assembly for improved throttle response.  If you are somewhat mechanically inclined, and have a little time, give it a try.  ReadBeard450 and friends deserve the credit for this document.

We would like to thank Josh- AKA-RedBeard450 for taking the time and sharing this information we will be providing. Under no circumstances will anyone take responsibility or liability for anything covered in this How-To Article for modifying your Accelerator Pump, attempt at your own risk. After recent review and input, it was brought to our attention that this mod has been performed in the past, but never formalized. If this is the case, we are not trying to claim sole credit for this mod. We did not have any prior knowledge when starting this about any previous explored AP Modifications other than the Yamaha BK Mod. We share this information with the full intent of helping others gain our experience and performance.

RedBeard in action...

This modification consists of altering your Accelerator Pump timing and altering the stock parts associated with the accelerator pump. By performing this mod, there have been noticeable gains in throttle responsiveness, making the bike less prone to low end bog and making the bike perform better than stock. While we understand that each bike is different, we have successfully test this mod on a 2004 CRF450R, 2005 CRF450R, and a 2006 CRF450R, all with noticeable performance gains.

Seat, Tank, and Shroud Removal

We will be providing the information based upon a 2006 CRF450R. There might be some slight differences or variations depending on your Model and Year, so keep that in mind when reviewing this document.

Remove seat...

The first thing we need to do, is start off with a clean bike, it will make things much easier and cleaner to work on. We will need to remove the Seat Bolts, Tank Shroud Bolts, Tank Bolt, and Right Side Number Plate and Bolt:

Remove tank...

Once you have these bolts removed, you should be able to lift the seat out of place exposing the Air Box and the Tank Strap that connects to the Frame/Sub frame. Remove the Tank Strap, and then remove the Fuel Petcock Mount Bolt.  Once these bolts are removed, make sure your fuel petcock is turned to the OFF position; disconnect the Fuel Line from the carburetor (some fuel might leak out). The tank and shroud assembly should lift out of the frame. Be careful when lifting the tank out, you might have to guide the petcock and fuel line through the frame spar and over the top of the camshaft cover. Once out, set aside.