Question about 2004 Suzuki VL 125 Intruder LC

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Where is the mixture screw on a suzuki 125cc intruder vl 2008, as it appears to be running rich and no manual, plugs get black and wet.

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The mixture screw is underside of carb,if its between cylinder and front side of carb its fuel/air,to lean turn screw clockwise,if its between backside of carb and air box/filter,its air/fuel,turn screw counter clockwise to lean,adjust with 1/8 turn at a time.

Posted on Feb 20, 2011

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Posted on Jan 02, 2017

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1998 Suzuki VL1500 intruder. Put stage 3 kit in it, having an issue if you open the throttle slowly it bogs down and begins to blow black smoke. Any ideas on where to begin troubleshooting?


Hi, Russell just got a request from Andrew to give you a hand, unfortunately, I'm all out of hands would a foot do? if you have changed your fuel delivery system, air filter size or flow rate, mufflers or exhaust system or a significant change in altitude your carburetors need re-tuning and if your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" your not getting enough fuel or air.
1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues. For more information about your issue and valuable "FREE" downloads that you will need please click on the websites below. Good luck and have nice a day.
How to remove welch plug air fuel screw cap from any motorcycle or small... just in case
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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Apr 12, 2017 | 2000 Suzuki VL 1500 Intruder LC

1 Answer

2001 Suzuki VL 800 Volusia will not idle


Hi, Anonymous it should be noted that the "AIR FUEL" mixture screw adjustment "ONLY" manages your idle and has no effect on any other circuit also any intake leaks must be repaired before the A/F adjustment procedure can be performed otherwise you will never obtain a proper idle and you will waste a lot of time chasing the impossible. The A/F mixture screw's purpose is to fine tune the fuel charge entering the combustion chamber. The following applies to both 2 and 4 stroke engines:
1. The mixture screw may be sealed at the factory with a Welch Plug please review the following video for removal.
https://www.youtube.com/watch?v=wAXcksgvDkM
2. The mixture screw manages a range of 3 complete 360-degree counterclockwise turns from the bottom/closed position.
3. The mixture screw should have a spring and o-ring for tension and sealing integrity.
4. Turn the mixture screw clockwise until it gently bottoms out, this makes the fuel charge very lean and the engine should not idle if it does then the pilot/idle jet is too big and needs to be replaced with the next size smaller.
5. Turn the mixture screw 1 and 1/2 turns counterclockwise to establish a baseline for starting the engine.
6. To fine-tune the idle circuit, adjust the mixture screw 1/4 turn in or out to achieve maximum idle RPM, wait 15 seconds between each adjustment for the idle to settle.
7. Never go past 3 full turns out this will make the fuel charge rich, foul plugs, and produce black smoke out of the exhaust, if the engine RPM keeps increasing past 3 turns the pilot/idle jet is too small and needs to be replaced with the next size larger.
8. After achieving maximum idle back out the mixture screw another 1/8 of a turn then adjust the throttle cable idle stop screw to 950-1050 RPM.
9. This procedure works great on 99% of all engines, for the 1% that demand a more robust throttle response on aftermarket monster fuel delivery systems additional tweaking outside the box may be necessary.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Wont idle with choke in Suzuki Volusia Forums Intruder Volusia and...
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Suzuki VL800 Service Manual
https://www.partsfish.com/page/oem-parts-for-suzuki
Suzuki 2004 VL800 Owner Manual

May 04, 2014 | 2001 Suzuki VL 800 Volusia

1 Answer

Agusta mv4 2005 fouling out possible causes


Bad gasoline, old plugs, over rich mixture ( is the exhaust stock?)
Check the compression,,

Good Luck

Sep 07, 2013 | 2003 Suzuki VL 125 Intruder LC

1 Answer

I have 2007 suzuki intruder the front spark plug was replaced 3 times due to intermitant spark.Each time i check the spark plug no spark then replace the plug then spark then runs for short period the No 1...


Fouling of the spark plug makes the exhaust extremely hot due to the burning of the fuel mixture inside the exhaust pipe and the spark plug end turn to black, fouling of the spark plug may be due to too rich fuel mixture check the correct setting of the air valve.

Jul 10, 2011 | 2001 Suzuki VL 250 Intruder LC

1 Answer

2004 Quest 500--Starts fine. Will run for about 1/2 hour. Starts to sputter and back fire then stops. I remove plug and its black. Change plug and starts and runs as new. Then it repeats itself again....


The problem would appear to either be with the mixture or with the head. Too rich a mixture (too much fuel) will cause black plugs - when you take them out do the engine and plugs smell of petrol? You need to adjust the carburettor. Mark where the throttle screw is to start with and then slowly screw it (in - I think) to reduce the petrol flow.
The other alternative is that their is a problem in the head. Does the engine blow a lot of blue/black smoke out when it is hot. If yes it means a full engine strip down!

Mar 03, 2011 | RTO 125cc Full Size Adult Quad ATV

1 Answer

96 intruder running rich


on your carbs on bottom side there are adjustment screws for fuel/air mix,if your air cleaner is clean and haveing this problem,you will have to get to these screws and turn them clockwise 1/8 turn to lean carbs out,it might take a few trys,so reading the spark plugs is good indicater,looking for tanish brown in color,black is rich,white is lean.

Feb 21, 2011 | 1996 Suzuki VS 800 Intruder

1 Answer

I have had the shop rebuild the carbs, I have changed the plugs. The rear plug will foul after a long ride 100 miles. cylinder pressure is good. any idea's were to go next?


when the shop rebuilt the carbs did they reinstall the carbs on the bike?it sounds to me like the rear cylinder is running very rich,the carbs will need to be set up with the mixtures and balance done,this is not expensive to do and is critical to the good performance of the bike,most reputable bike shops will be able to do this,hope this helps

Jul 10, 2009 | 2001 Suzuki VL 1500 Intruder LC

2 Answers

2000 Suzuki Intruder VL1500 misfire


Hey, I have a 2000 Intruder 1500 as well and in the last week I have had the exact same problem and was thinking the same thing. I checked the front plug and it is pretty covered in black and changed both plugs. This did not help, still seemed like the front cylinder wasn't working just right. If you could let me know what you eventually find I would really appreciate it.

Jun 21, 2009 | 2002 Suzuki VL 1500 Intruder LC

1 Answer

Plugs are black aft.mrkt pipes bike runs good


Factory recommended plugs are the best. Ask your local dealer, and he will give you the correct plugs. If you are fouling plugs, look for a too rich mixture, or carbs flooding.

Jun 06, 2009 | 1996 Suzuki VS 1400 Intruder

3 Answers

Engine turns over / Petrol OK/ No Spark


as with any problem you need a clymer book for your bike or you can disconnect the wiring harness(all of them one at a time)turn the key on and use a volt meter to make sure you are getting power.does the engine turn over?

Apr 20, 2009 | 2002 Suzuki VL 125 Intruder LC

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