02 Big Bear 400 4x4 carb leaking gas top tube - Yamaha ATV Forum
 
LinkBack Thread Tools Display Modes
post #1 of 3 Old 08-18-2009, 10:54 AM Thread Starter
Junior Member
 
Join Date: Aug 2009
Posts: 4
02 Big Bear 400 4x4 carb leaking gas top tube

leaking gas out of the top tube by the air mixture screw after I removed my carb on an '02 400 Big Bear 4X4 as it was leaking gas out of the bottom drain/overflow tube; so figured it was a stuck float and did not know what else to do (already sprayed and ran gumout through carb). The float seemed stuck when I took the bowl off.. I moved the float up and down and it seemed ok.. so when I put the carb back on the quad it now runs like it is cold with the choke on (alomost sputters) and leaks gas out of the top tube (not sure what the name of the tube is but essentially it just goes out to the atmosphere). If I turn the gas petcock off it runs great for about 15 seconds until it runs out of the gas in the carb.

Any help would be greatly appreciated... thanks.
gbarry is offline  
Sponsored Links
Advertisement
 
post #2 of 3 Old 08-31-2011, 04:20 PM
Junior Member
 
Join Date: Aug 2011
Posts: 1
I have the same problem

I have this same problem with a 2001 Big Bear 400. How did you fix this ?
landermoto is offline  
post #3 of 3 Old 09-08-2011, 10:35 PM
Junior Member
 
Join Date: Aug 2010
Location: NC
Posts: 3
It sounds like the float needle is not completely sealing up and allowing gas to overflow the normal level in the bowl. When you turn off the petcock the fuel in the bowl is being used up so the level is more like normal, so it runs better.

This is not terribly uncommon especially on older carbs. Try (carefully) removing the float to get a good look at the needle (valve). You can remove the needle and wipe it down real good, carb cleaner, etc. Just be careful if you pull the float needle tube out as they have small o-rings that can get torn and then it will constantly leak.

Beware of the cheaper aftermarket rebuild kits as the new float valves that come in them are sometimes worse then the one you are replacing.

In theory if you get the float, float needle, and complete valve system working it can not over fill the bowl with fuel.

Mike a.k.a."Secret Weapon"

www.bigkevsperformance.com
(919) 803-0883
mrb302 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Yamaha ATV Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Carb leaking gas laslow Yamaha YFM350 Raptor/Warrior ('87-Present) 3 05-19-2009 11:08 AM
big bear carb on a warrior Robby Yamaha YFM350 Raptor/Warrior ('87-Present) 4 12-23-2008 12:41 AM
Carb leaking... raptrax Yamaha YFM660R Raptor (2001-2005) 4 12-09-2008 10:16 PM
leaking carb oakmeadows Yamaha YFZ350 Banshee (1987-Present) 5 04-11-2004 01:49 PM
STOCK CARB CHOKE CONNECTION TUBE rdrago Yamaha YFZ350 Banshee (1987-Present) 1 12-10-2003 12:58 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome