Accelerator pump diaphragm

3 replies to this topic
  • yzf_rider400

Posted July 03, 2005 - 10:39 AM


My AP diaphragm on my yz400 blew out and I need to buy a replacement one. I looked on the bike bandit website and found that they offer four or so different ones. One of the AP diaphragms is labeled as (STD) while the others are (AP). Does STD stand for STANDARD and is this the one I should buy?

Thanks for the help.

  • Hick

Posted July 03, 2005 - 12:03 PM


Yes, just get the STD one.

The optional ones listed may not even be available. I tried for almost a year to get some for my '00 in an effort to tune the AP but was never able to get one.

I think James Dean finally got his hands on some optional diaphragms but I can't recall what the difference was, I want to say the center button was of different lengths...

Hope this helps.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • yzf_rider400

Posted July 03, 2005 - 12:06 PM


Thanks Hick. :)

  • gunnydan

Posted July 03, 2005 - 07:12 PM


You are correct. The difference is the nub on the fuel side. I can tell you from experience that you should stay with the std one. I had one with almost no nub and it bogged the bike really bad, to much fuel.

Related Content


Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews

Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

Megabomb Fitment by 288yz450

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply

James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies

YZ450F 03 Sparks driving me crazy by SirAttard

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 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.