450 Acc pump cover on a 426 carb?

5 replies to this topic
  • Math

Posted July 15, 2005 - 09:27 AM


OK, I don't have a leak jet on my 426: normal.

Can I install one? From what I understand, the leak jet is located in the AP bowl or cover so I suppose that if I buy a WR450 one I could install it on my 426 and work with it right?

What do you guys think? :applause:

  • Math

Posted July 18, 2005 - 12:29 PM


C'mon, anybody has an idea ? :applause:

  • rpyfz450

Posted July 18, 2005 - 12:35 PM


The YFZ450 (ATV) also has a leak jet. I changed mine from a #50 to a #35 (smallest available) and really didn't see any performance improvement.

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  • Hick

Posted July 18, 2005 - 09:56 PM


OK, I don't have a leak jet on my 426: normal.

Can I install one?

Pretty sure the leak jet is integral to the float bowl, so you would have to swap that out, not the AP cover.

This is a good question.

I can't see why a WR450 carb bowl would not bolt directly up to your bike, but I'm not sure if you can buy this part.

  • Stonie426

Posted July 19, 2005 - 02:03 AM



Hick is correct, the leak jet is an integral part of the float bowl. This is the part you would have to replace along with a leak jet itself. Both parts are available from Sudco (Allens R&D Performance in the UK).

IMHO you're better off doing the BK mod and jetting accordingly instead.... it's just as effective and a lot less hassle to set up and fine tune once modified.


  • Math

Posted July 19, 2005 - 04:55 AM


Thanks for the info guys. I thought the leak jet was located somewhere in the acc pump cover. :applause:

A new float bowl is probably expensive as a friggin diamond... forget it.

I'll make the trip to the state of NY in about two weeks and I'll get the parts I need to rejet like a YZ and will start from there. Then I'll see if I do the BK.



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