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Fuel not getting in carb

This is a discussion on Fuel not getting in carb within the Yamaha YFZ450/450R (2004-Present) forums, part of the Performance /Technical category; 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 ...


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Old 08-29-2005, 02:37 PM   #1
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Default 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!
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Old 08-29-2005, 03:08 PM   #2
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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.
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Old 08-29-2005, 05:49 PM   #3
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I'll try it. thanks
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Old 08-29-2005, 06:34 PM   #4
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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.
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Old 08-29-2005, 10:39 PM   #5
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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).
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Old 08-30-2005, 12:10 PM   #6
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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
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Old 08-30-2005, 05:17 PM   #7
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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 .
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Old 08-30-2005, 10:12 PM   #8
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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
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Old 08-31-2005, 10:16 AM   #9
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Has it been sitting for a while? What fuel are you running? The oxygenated fuels tend to gel up quite quickly...
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Old 08-31-2005, 12:12 PM   #10
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#23 is the needle valve
#48 is the jet needle

http://www.imagessite.com/OEM_Images...4YFZ450S09.gif
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Old 08-31-2005, 01:32 PM   #11
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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.
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Old 09-02-2005, 02:33 PM   #12
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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!
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Old 09-02-2005, 03:07 PM   #13
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Bringing your ATV to the dealer for minor fixes is lame!
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Old 09-02-2005, 05:32 PM   #14
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Old 09-02-2005, 08:08 PM   #15
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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.
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Old 09-02-2005, 08:56 PM   #16
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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?
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Old 09-02-2005, 09:24 PM   #17
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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.
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