'04 450 carb mods

2 replies to this topic
  • BBrown626

Posted November 13, 2006 - 08:24 AM


I read some questions here before about responsiveness of the 450 on the bottom end. I always thought I would like my bike to pull harder out of the corners than it does stock. I have yet to invest in a pipe and didn't want to touch hot cams or other solutions.

I spoke with a Shock Therapy mechanic recently. He told me about a mod mentioned on TT that fixes the flat spot on the bottom. The mod includes wiring/pinning a part in the accelerator pump. He also suggested that a spring be cut and he had a device replaced -- I think he called it the P28?-- it is at the bottom of the carb, on the inboard side. From the outside you just see a red flange, about an inch in diameter (stock is aluminum just like the carb body). I gave his bike a test ride and it really did have better response. He said the factory has to set them up rich off the bottom to meet some emision requirements?

Anyone accomplished these mods?

I think the mod involving the accelerator is the BK mod. Is the BK mod applicable to the 2004 bikes?


Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • BBrown626

Posted November 16, 2006 - 11:26 AM


No help?

  • GreenKLX

Posted November 16, 2006 - 11:46 AM


he is taking about the mod in the honda 450 forum. Look at the sticky that says, "now this is just ridiculous."

Related Content


Chubby dad, looking at bikes , First trip to the orange/black forum ! by Slow_ride

Dirt Bike   Make / Model Specific   KTM   250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes)
  • Hot  28 replies

100 hrs on 2014 yz450f, shim valves or replace them? by ttr230rider6

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  79 replies

Michigan Motocross Tires by 288yz450

Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply

Need help by Goforaride

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  68 replies

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.