New carb adjustment - Suzuki ATV Forum
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post #1 of 25 Old 06-30-2019, 07:17 PM Thread Starter
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New carb adjustment

Brand new (chinese) carb off amazon.

I tried the default adjustment and tried to adjust the idle screw clockwise and counter clockwise 1/4 turn with no changes. Quad will start to run on choke, idle pretty high. If I give any throttle it will bog down. It will run high then the idle will come down for about 10 seconds then stall out. I've tried to clean it a bit with carb cleaner if maybe I had bad gas, but I get the same issue. I tried to seat the screw all the way then loosen it ~2.6 turns (per the manual) and I get the same response.

Any suggestions?

1998/1999 LTF4WDX

Last edited by vdubstreets; 07-01-2019 at 07:44 AM.
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post #2 of 25 Old 06-30-2019, 08:27 PM
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What model/year Suzuki is it..?


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2000 Suzuki King Quad 300 4x4
K&N Air Filter
2300 lbs Superwinch
Kenda Bear Claws (Rear 25X10-12) - (Front 24X9-11)
Differential Lock Mod
14,000 + km/s
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post #3 of 25 Old 07-01-2019, 07:45 AM Thread Starter
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Quote:
Originally Posted by ajl719 View Post
What model/year Suzuki is it..?


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Good point added: 1998/1999 LTF4WDX.
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post #4 of 25 Old 07-01-2019, 09:44 AM
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New carb adjustment

Cheap Chinese knock off carbs sometimes make things worse. The high revs sound like you might have a vacuum leak between the air box and carb. Maybe sure everything is 100% air tight. Another possibility is a faulty fuel petcock. When it goes bad it can lead to all sorts of problems such as: stalling, poor idling, back firing, power loss, hesitation. Though this wouldn’t cause high revs which leads me to suspects you have a vacuum leak as I mentioned. Check for leaks and go from there.


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2000 Suzuki King Quad 300 4x4
K&N Air Filter
2300 lbs Superwinch
Kenda Bear Claws (Rear 25X10-12) - (Front 24X9-11)
Differential Lock Mod
14,000 + km/s
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post #5 of 25 Old 07-02-2019, 01:49 AM
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Same advice as ajl719, trie spray wd40 (or equivalent) on intake boot when idle, and verified rpm variations.
For the faulty fuel petcock/fuel pump possibility, try supply fluel directly to the carb (by gravity).

Last edited by PauloS; 07-02-2019 at 05:52 AM.
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post #6 of 25 Old 07-02-2019, 03:48 PM
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If you have to use the choke to keep it running it's probably lean. Either air leaking in somwere or it's not getting enough fuel.

Your Chinese knockoff carburetor may not be jetted right for your quad. Or the mixture screw may need turned out farther.

Could also be a vacuum leak. I'd start the engine. Then spray some carb clean or starting fluid on the intake between the carb and engine. And on all the vacuum lines. If it has a leak you will hear the idle go up or down depending on what you spray it with.

Could also be an issue with the fuel petcock or fuel pump. It also could be a clogged fuel filter or in tank fuel strainer.

The vacuum leak is probably easiest to check for so I'd start there.
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post #7 of 25 Old 07-08-2019, 07:21 PM Thread Starter
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So with the criticism of the Chinese Carbs I've decided to go back to the OEM. I rebuilt it a while back but wasn't getting any luck with it.

1. I tested the Peacock by taking off the line flowing into the fuel pump. Gas flows fine.
2. I can see that I'm getting gas into my carb as the fuel filter is see through. I took it off and a ton of gas came out so looks like that is flowing fine.
3. I tried to start it with the old carb, and I could not get it to run at all with our without the choke.
4. I sprayed either/starting fluid and it barley pops.


My next steps are to take the oem carb apart again and clean all the jets and ports.
I'm sure I have a vacuum leak somewhere since I don't know what the three ports are on the top. (labeled 1,2 and 3)
The previous owner just ran a hose to jump 1 and 2 and had nothing on three.

I assume one goes to the fuel tank cap? I don't have a nipple on the back of my pea cock for the others?

What would you guys do from here?



Click the image to open in full size.
Click the image to open in full size.

Last edited by vdubstreets; 07-09-2019 at 08:17 PM.
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post #8 of 25 Old 07-08-2019, 09:13 PM
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Clean out the OEM carb/jets real well then buy yourself a carb rebuild kit. I’d try that then go from there.


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2000 Suzuki King Quad 300 4x4
K&N Air Filter
2300 lbs Superwinch
Kenda Bear Claws (Rear 25X10-12) - (Front 24X9-11)
Differential Lock Mod
14,000 + km/s
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post #9 of 25 Old 07-08-2019, 11:48 PM
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Quote:
Originally Posted by vdubstreets View Post
So with the criticism of the Chinese Carbs I've decided to go back to the OEM. I rebuilt it a while back but wasn't getting any luck with it.

1. I tested the Peacock by taking off the line flowing into the fuel pump. Gas flows fine.
2. I can see that I'm getting gas into my carb as the fuel filter is see through. I took it off and a ton of gas came out so looks like that is flowing fine.
3. I tried to start it with the old carb, and I could not get it to run at all with our without the choke.
4. I sprayed either/starting fluid and it barley pops.


My next steps are to take the oem carb apart again and clean all the jets and ports.
I'm sure I have a vacuum leak somewhere since I don't know what the three ports are on the top. (labeled 1,2 and 3)
The previous owner just ran a hose to jump 1 and 2 and had nothing on three.

I assume one goes to the fuel tank cap? I don't have a nipple on the back of my pea cock for the others?

What would you guys do from here?



Click the image to open in full size.
Click the image to open in full size.
with #3 open.....that was part of the problem with too much air.

I think #1 is a vent which is just a open ended hose ran up under the shifter
#2 goes to the fuel pump
#3 goes to the petcock

FYI that filter is probably letting in TOO much air.....you need to use the original filter in the box with lid and the rest of the duct work...these bikes are real finicky on this.

2002 King Quad 300
2001 King Quad 300
1997 King Quad 300
1997 quad Runner 250 2x4
2008 Kawasaki 250 Bayou 2x4
2013 TaoTao 110

Last edited by TCIII; 07-08-2019 at 11:59 PM.
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post #10 of 25 Old 07-09-2019, 06:23 AM
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Some fuel petcocks do not have the vacuum port. If yours was replaced with this style you should be able to cap it's vacuum port on the carburetor. Any local auto parts store should carry vacuum caps to plug the port.

The vent on the fuel tank cap doesn't go to the carburetor. It's just a vent. Usually would have a line running from the cap down through the plastic panel around the shifters below the speedometer. If you zoom in on this pic of mine you can see the vent line coming off the gas cap.
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