Performance Mods and Project Quads Share and ask for information about modifying your ATV or building project quads.

440ex carb getting help

  #1  
Old 08-11-2017, 11:14 AM
Weekend Warrior
Thread Starter
Join Date: Aug 2017
Posts: 5
Likes: 0
Received 0 Likes on 0 Posts
Default 440ex carb getting help

So I just bought a 2001 400ex with 440 bore kit. It has a white bros exhaust slip on. What size jet would be used with the bore kit and the exhaust. The jet that is in now keeps flooding the carb unless it's floored and I do a lot of trail/woods riding and it's just not working out when there is no low end power. Could anybody help me out?
 
  #2  
Old 08-11-2017, 11:42 AM
Kymco 450i's Avatar
Pro Rider
Join Date: Jan 2016
Location: Perrysburg Ohio
Posts: 1,735
Likes: 0
Received 1 Like on 1 Post
Default

Your best bet is to contact a company that specializes in carb services and rebuild kits. Your problem may not be a simple jet change. In years past I used the "UNI" company, contacted them with the engine specs and any mods done to it along with any issues I might have. They would then send me a carb rebuild kit with all the instructions for setting up the carb and proper jet sizes. Every kit I ever bought from them worked very well and instructions were easy to follow. Why guess, when for a few bucks you can get it right.
 
  #3  
Old 08-11-2017, 12:33 PM
Weekend Warrior
Thread Starter
Join Date: Aug 2017
Posts: 5
Likes: 0
Received 0 Likes on 0 Posts
Default

I typed in UNI carb rebuild kit but I don't think I am finding the right things...
 
  #4  
Old 08-11-2017, 12:42 PM
Kymco 450i's Avatar
Pro Rider
Join Date: Jan 2016
Location: Perrysburg Ohio
Posts: 1,735
Likes: 0
Received 1 Like on 1 Post
Default

It has been a few years since I used them last but I do know they are still in business. They specialize in air filters but always had a carb service as well.
Try looking for UNI air filters and then give them a call. I also know there are other carb specialist companies out there just haven't had experience with them.
 
  #5  
Old 08-11-2017, 03:04 PM
old polaris tech's Avatar
Polaris ATV Expert
Retired and loving it!
Join Date: Jun 2008
Location: North Texas
Posts: 24,352
Likes: 0
Received 0 Likes on 0 Posts
Default

Flooding out could be float needle related also. Good Japanese kit here if needed.HONDA TRX400EX TRX 400 EX CARBURETOR CARB REPAIR REBUILD KIT 1999-2004 2000 2001 | eBay Plus Jetsrus has individual or a jet set.https://www.jetsrus.com/a_jet_kit_at..._1999-2008.htm
 

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: