Fuel not getting in carb - Yamaha ATV Forum
 
LinkBack Thread Tools Display Modes
post #1 of 17 Old 08-29-2005, 02:37 PM Thread Starter
Senior Member
 
Join Date: Nov 2004
Posts: 108
Fuel not getting in carb

In can't seem to get fuel into the carb. I have fuel flowing from the tank to the carb, but it seems as though there is something blocking or stuck right in the spot that the fuel enters the carb. I tried carb cleaner etc. no luck. I think the needle jet is stuck in the closed position. Can anyone tell me how to get the needle jet out, to inspect it? Or if that is even the problem?
Btw, just to make sure it wasn't something other than the carb, I poured gasoline directly into the bowl & it started right up & ran until the gasoline ran out.

Thanks!

2004 YFZ 450
Cam Mod
FMF Factory 4
Pro Design
Holeshots
ITP T-9's
Tag 2
thecort is offline  
Sponsored Links
Advertisement
 
post #2 of 17 Old 08-29-2005, 03:08 PM
Admizzlstrizzle
 
screamin96's Avatar
 
Join Date: Nov 2000
Location: New York
Posts: 19,155
Yea sounds like your needle valve is clogged/stuck. Take the float bowl off and remove it from there. You may first want to blow a little compressed air in the gas inlet first to see if you can unstick it.


mike/screamin96
'96 Banshee
'04 YFZ450
'05 Kodiak 450 4x4
'01 Raptor 660R
'?? YF'shee
screamin96 is offline  
post #3 of 17 Old 08-29-2005, 05:49 PM Thread Starter
Senior Member
 
Join Date: Nov 2004
Posts: 108
I'll try it. thanks

2004 YFZ 450
Cam Mod
FMF Factory 4
Pro Design
Holeshots
ITP T-9's
Tag 2
thecort is offline  
Sponsored Links
Advertisement
 
post #4 of 17 Old 08-29-2005, 06:34 PM
Member
 
Join Date: Mar 2004
Posts: 99
Take your gas cap off and see if it makes any difference. Sometimes the vent line on the cap will get clogged and it will create a vacume that will stop or at least slow down fuel flow. May not be your problem but worth a try if there turns out to be nothing wrong with your floats or mj.

Also try switching to reserve, it uses a seperate pickup in the tank, your main one might have a problem.

But like i said these things are just something easy to try in a pinch.
jshtex is offline  
post #5 of 17 Old 08-29-2005, 10:39 PM Thread Starter
Senior Member
 
Join Date: Nov 2004
Posts: 108
Quote:
Originally Posted by jshtex
Take your gas cap off and see if it makes any difference. Sometimes the vent line on the cap will get clogged and it will create a vacume that will stop or at least slow down fuel flow. May not be your problem but worth a try if there turns out to be nothing wrong with your floats or mj.

Also try switching to reserve, it uses a seperate pickup in the tank, your main one might have a problem.

But like I said these things are just something easy to try in a pinch.
Thanks for the advice.

Fuel flows from the tank to the carb just fine. It's when it reaches the carb that I have the problem. The port that the fuel line attaches to is not allowing fuel to get into the carb, at all. That's why I think it's the needle valve (not the needle jet).

2004 YFZ 450
Cam Mod
FMF Factory 4
Pro Design
Holeshots
ITP T-9's
Tag 2
thecort is offline  
post #6 of 17 Old 08-30-2005, 12:10 PM
Member
 
Join Date: Aug 2004
Posts: 91
doesn't the needle seat in the main jet to control fuel flow through the main?

How about our float valve? I've seen more than one stuck. If it sticks shut, your bowl will be dry and therefore no gas in the carb...a quick tap with the end of a screw driver on the bowl might loosen up the valve. Or just open it up and check..

There was a recent thread on incorrectly adjusted floats too...

my 2 cents
lantz is offline  
post #7 of 17 Old 08-30-2005, 05:17 PM Thread Starter
Senior Member
 
Join Date: Nov 2004
Posts: 108
Quote:
Originally Posted by lantz
doesn't the needle seat in the main jet to control fuel flow through the main?

How about our float valve? I've seen more than one stuck. If it sticks shut, your bowl will be dry and therefore no gas in the carb...a quick tap with the end of a screw driver on the bowl might loosen up the valve. Or just open it up and check..

There was a recent thread on incorrectly adjusted floats too...

my 2 cents

It's the needle valve that i'm having trouble with, not the needle jet. The float valve IS the needle valve. That seems to be the problem. I just can't get access to it. I've taken the float bowl off, tried the spring adjustment, tapped the carb (which worked about 3-4 times) & even pulled on the little "plunger". I think something is either stuck/clogged in there or the needle valve itself is stuck. Either way, I can't get fuel into the carb.


So, I just brought it to the dealer.

Interesting thing happened there. I mentioned it to the mechanic & he said that that is what he thought it was too, because he's had other dudes bring in their quads for the same problem. Seems like it's an issue with the 450 .

2004 YFZ 450
Cam Mod
FMF Factory 4
Pro Design
Holeshots
ITP T-9's
Tag 2
thecort is offline  
post #8 of 17 Old 08-30-2005, 10:12 PM
Member
 
Join Date: Aug 2004
Posts: 91
thanks...I had no idea what those parts were called. There is a little spring that holds the needle valve in place. You can take it out and pull the plunger out. Clean it off, and it should work for a while...

We did this a couple of times with my buddies quad, but once it started it kept doing it ever time the quad sat for more than a week or two. The dealer fixed it, but charged him for the repairs becuase he said we bent the spring removing the valve to clean it...

glad you tracked it down
lantz is offline  
post #9 of 17 Old 08-31-2005, 10:16 AM
Senior Member
 
Join Date: Mar 2003
Location: Westerly, RI
Posts: 182
Send a message via AIM to muff
Has it been sitting for a while? What fuel are you running? The oxygenated fuels tend to gel up quite quickly...

'04 Walsh YFZ
Maxima - BCS Performance - Yoshimura - RPM - Regina - Scott - Galfer
muff is offline  
post #10 of 17 Old 08-31-2005, 12:12 PM
Senior Member
 
Join Date: Aug 2003
Posts: 1,405
#23 is the needle valve
#48 is the jet needle

http://www.imagessite.com/OEM_Images...4YFZ450S09.gif

2004 YFZ450
RPyfz450 is offline  
post #11 of 17 Old 08-31-2005, 01:32 PM Thread Starter
Senior Member
 
Join Date: Nov 2004
Posts: 108
Quote:
Originally Posted by muff
Has it been sitting for a while? What fuel are you running? The oxygenated fuels tend to gel up quite quickly...
Actually, it has been sitting a while. I went from riding an average of once a week, to maybe once in the last 2.5 months.
I think it should be ready tomorrow or Friday.

2004 YFZ 450
Cam Mod
FMF Factory 4
Pro Design
Holeshots
ITP T-9's
Tag 2
thecort is offline  
post #12 of 17 Old 09-02-2005, 02:33 PM Thread Starter
Senior Member
 
Join Date: Nov 2004
Posts: 108
Picked up my quad today. All is well again. It was a stuck needle valve as suspected. Thank you to all who responded to this post.

Now, i'm going to go out & CRUSH a few new Raptor 700's!

2004 YFZ 450
Cam Mod
FMF Factory 4
Pro Design
Holeshots
ITP T-9's
Tag 2
thecort is offline  
post #13 of 17 Old 09-02-2005, 03:07 PM
Senior Member
 
Join Date: Aug 2003
Posts: 1,405
Bringing your ATV to the dealer for minor fixes is lame!

2004 YFZ450
RPyfz450 is offline  
post #14 of 17 Old 09-02-2005, 05:32 PM
Senior Member
 
Join Date: Jun 2003
Posts: 307
Werd

'04 YFZ450, Cam Mod, No-Lid, Filter, K&N/Outer, Relocator, Yoshi Full, CDI, Needle, 45, 168, 3.5, Zip, Nerfs, Guards, Skids, A/C Bumper, +1 Douglass w/ Maxxis Razor 2, etc ..
mikegekko is offline  
post #15 of 17 Old 09-02-2005, 08:08 PM Thread Starter
Senior Member
 
Join Date: Nov 2004
Posts: 108
Quote:
Originally Posted by RPyfz450
Bringing your ATV to the dealer for minor fixes is lame!
Sorry I don't have the summer off from school to work on my quad, in Daddy's garage, while Mommy is wiping my ass.

2004 YFZ 450
Cam Mod
FMF Factory 4
Pro Design
Holeshots
ITP T-9's
Tag 2
thecort is offline  
post #16 of 17 Old 09-02-2005, 08:56 PM
Senior Member
 
Join Date: Sep 2004
Location: Southeast PA
Posts: 937
Send a message via AIM to YFM350 RAPTOR
Quote:
Originally Posted by thecort
Quote:
Originally Posted by RPyfz450
Bringing your ATV to the dealer for minor fixes is lame!
Sorry I don't have the summer off from school to work on my quad, in Daddy's garage, while Mommy is wiping my ass.
You dont have 10 mins to pull your carb off?

['04 350 RaptoR]
YFM350 RAPTOR is offline  
post #17 of 17 Old 09-02-2005, 09:24 PM Thread Starter
Senior Member
 
Join Date: Nov 2004
Posts: 108
Quote:
Originally Posted by YFM350 RAPTOR
Quote:
Originally Posted by thecort
Quote:
Originally Posted by RPyfz450
Bringing your ATV to the dealer for minor fixes is lame!
Sorry I don't have the summer off from school to work on my quad, in Daddy's garage, while Mommy is wiping my ass.
You dont have 10 mins to pull your carb off?
Sure I have 10 mins, if that's all it took. But, you have to do just a little more than 10 minutes worth off work to diagnose, repair & re-install it. Probably a minimun of 1/2 hr. I don't have that time right now. If it took longer than 5 mins to respond to this post I wouldn't do that either. Anyway I got it fixed so I guess I won't be going riding anyway, with my busy sched.

If you have nothing to do, i'll pay you to fix my bike when it breaks.

Read the whole thread, you'll see that I already had taken off the carb.

2004 YFZ 450
Cam Mod
FMF Factory 4
Pro Design
Holeshots
ITP T-9's
Tag 2
thecort is offline  
Closed Thread

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
Raptor carb fuel/air screw? Jmyamaha660 Yamaha YFM660R Raptor (2001-2005) 2 05-07-2008 08:23 PM
warrior fuel/carb problem adamprice Yamaha YFM350 Raptor/Warrior ('87-Present) 14 01-22-2007 09:43 PM
Fuel pouring out vent on carb ????? Bad ass 450 Yamaha YFZ450/450R (2004-Present) 2 03-20-2005 09:15 AM
No fuel in carb?? Help please Todd 54 Yamaha YFZ450/450R (2004-Present) 5 12-30-2004 04:09 PM
Fuel Screw on Carb???? Allen Yamaha YFZ450/450R (2004-Present) 3 11-03-2004 06:00 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