02 Big Bear 400 4x4 carb leaking gas top tube - Yamaha ATV Forum
Yamaha Sport ATV Forum

02 Big Bear 400 4x4 carb leaking gas top tube

This is a discussion on 02 Big Bear 400 4x4 carb leaking gas top tube within the Other Models/Brands forums, part of the Performance /Technical category; 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 ...

Go Back   Yamaha ATV Forum > Performance /Technical > Other Models/Brands

LinkBack Thread Tools Display Modes
Old 08-18-2009, 10:54 AM   #1
Junior Member
Join Date: Aug 2009
Posts: 4
View gbarry's Photo Gallery(0)
Default 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   Reply With Quote
Old 08-31-2011, 04:20 PM   #2
Junior Member
Join Date: Aug 2011
Posts: 1
View landermoto's Photo Gallery(0)
Default I have the same problem

I have this same problem with a 2001 Big Bear 400. How did you fix this ?
landermoto is offline   Reply With Quote
Old 09-08-2011, 10:35 PM   #3
Junior Member
Join Date: Aug 2010
Location: NC
Posts: 3
View mrb302's Photo Gallery(0)

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"

(919) 803-0883
mrb302 is offline   Reply With Quote

Search tags for this page

yamaha big bear leaking gas


yamaha bear tracker gas flowing out drain vlave


2002 yamaha big bear fuel leaking out of overflow when off


setting big bear 400 float leval


big bear 400 carb pouring out fuel

gas overflow top hose bigbear 400
yamaha 400 big bear gas leaking carb
carb on yamaha 350 big bear quad bike leaking petrol
2009 yamaha big bear 400 carb leaking gas
yamaha big bear gas coming out of overflow tube
how do i drain the fuel bowl on yamaha big bear 400
2000 yamaha big bear 400 4x4 gas leaking out of air filter box
Click on a term to search our sites for related topics.

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

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

All times are GMT -5. The time now is 05:12 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.