Mikuni TM40 Pumper Carb


1 reply to this topic
  • XR600SMoto

Posted June 06, 2004 - 10:02 AM

#1

Hi,
I've just recently got my hands on a Mikuni TM40 Pumper carb. It has a 165 main jet and a 17.5 slow jet. I'm currently turning up a couple of Aluminium sleeves to fit the manifold and the airbox.
My XR is a 600 which has been taken out to 628cc with a Wiseco high compression piston. I'm running White Bros oversize header pipes and an Arrow Aluminium race can. The inlet tract has been widened and slightly straightened and completely smoothed. The airbox has the usual mods and is running a K&N filter.
Can anyone give me an idea of what jetting I should be using?
Any help would be appreciated

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • BWB63

Posted June 06, 2004 - 10:21 AM

#2

Looks like this was setup for a stock Harley. You won't be able to move the same amount of air. There is an air jet in the air intake side (air filter side). It's at the bottom it is real small and screws out. You will have to go with at least a 1.2. If you can get a 1.3 (that would be better maybe even a 1.4) I haven't seen one yet but, I haven't looked ether. This will supply the extra air you need to make this work. The bigger the air jet the leaner the bottom end, between the pilot and needle curcit. The pilot you have up to a 20 & 22.5 will be good to have on hand. Y-4 needle jet for shure, (maybe a Y-2) you probably have a Y-6. A 9oij-1 needle ( I think you have a 9DHY1-4)and a 135 main or there abouts. This should get the bike to run and give you a place to start. :awww: If you have a few jets (up and down) it will work. I have gray PVC sleaves on mine and they work great. They are glued on and don't move or leak even with sick air time.

It takes some time but, it will be worth it :lol: that's alot of caruretor :lol: borynack@hotmail.com this will be good for others that fallow your foot steps :thumbsup: use the force :lol:





Related Content

Reviews

Honda XR650L 2016 by Chris.GVS


Honda XR650L 2016
  • - - - - -
  • 0 reviews
Forums
Photo

2015 XR650L Squeaking noise by Crayjay


Dirt Bike   Make / Model Specific   Honda   XR600/650
  • 3 replies
Forums
Photo

ignitech programmable XR650L CDI by brianhare


Dirt Bike   Make / Model Specific   Honda   XR600/650
  • Hot  60 replies
Forums
Photo

93 xr650l Restoration Project by Zigster


Dirt Bike   Make / Model Specific   Honda   XR600/650
  • 17 replies
Forums
Photo

Engine Loping/Sputtering by tcaldwell


Dirt Bike   Make / Model Specific   Honda   XR600/650
  • 2 replies
 
x

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.