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Plug foul I am having a problem with my 2003. It keeps fouling plugs running too rich. I tried raising the needle and it still runs too rich. Last year it ran fine until the end of the summer. It fouled out I thought it was bad gas

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But now I see it isn't. Since then I have installed a new air filter new packing in the muffler new reeds. I cleaned the carborator and check to make sure the needles weren't defective. Also I checked the flow valves and they are free of debris. That's simple enough you either have your gas mixed wrong or there's a bad seal somewhere so check the gaskets that should take care of it.,,,

Posted on Nov 10, 2008

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Why does my 04 yamaha r6 keeps fouling plugs


Hi, Anonymous and the usual suspects are:
1. Fuel mixture too rich or enrichner left out too long.
2. Incorrect spark plugs for your kind of service.
3. Piston rings badly worn or broken.
4. Valve guides are badly worn and/or seals worn, crushed or have come off valve guide and pump oil through it.
5. Spark plug cable weak or ignition coil faulty.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Still having problems fouled spark plugs
What does fouled spark plug sound like Yamaha R1 Forum YZF R1 Forums
2003 2004 Yamaha YZF R6 Service Manual R6 Moto Data Project
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Mar 21, 2012 | 2004 Yamaha YZF-R6

1 Answer

My 04 harley night train keeps fouling plugs left and right i richened the mixture with a 52 pilot jet. ran fine for awhile then fouled again could this be an electrical problem?


A #52 pilot is a bit on the rich side in my opinion. I usually use either a #48 or a #50 but each machine is a bit different and your location effects it as well. I wouldn't think an electical problem is the cause or you'd notice erratic engine performance prior to the plugs fouling such as misfiring, coughing or spitting back through the carb. How long are you running the enricher when cold starting the engine? This is the biggest reason I see for fouling plugs. People will start the engine with the enricher and allow the engine to run while they put their riding gear on, sometimes five minutes at full enrichement. This will foul the plugs quickly. The enricher uses a different fuel circuit than the normal running operation uses. It draws fuel directly from the float bowl and it's a very rich mixture. Try starting the bike with the enricher and once you can keep the engine running with the throttle, turn the enricher off. Use the throttle tension knob underneath the throttle to hold the throttle open enough to keep the engine running until it warms up.

Good Luck
Steve

Sep 03, 2011 | Harley Davidson FXSTB Night Train...

1 Answer

Wet fouling plugs


Thank you for the inquiry.
In most cases with wet fouling plugs is a result of your jetting being to rich. We see this quite often when we jet for the High Desert above 5000 feet and then the following weekend go to the Coast Range or the valley not exceeding 1000 feet altitude.
There is usually pretty good jetting information in the service manual. KTM's carburetors have all kinds of jets available for Main, Pilot, and Needle. I would start by purchasing a size or two smaller pilot jets. The needle jet fuels the middle RPM range and maybe it's set to high and over-fueling the engine. White exhaust will be an indicator. You can raise the cir-clip position on the needle which will lower its position fueling it less. Try that. There is usually 3 - 4 needle positions.
Hope this helps helps. Please keep us updated and remember to rate this answer.
Keep the wire tight,
TF

Jun 04, 2011 | 2003 KTM EXC 300

1 Answer

I have a 2002 yamaha yz250f. it started out not wanting to idle so i took apart the carb i got a rebuild kit and put new jets and started the bike up. it started up when i have the choke on. when i took...


Air to fuel ratio is important to starting and running your bike. A lean condition is when you have too much air for the fuel, this makes HEAT. A rich condition is too much fuel for the air, this FOULS plugs. An easy way to adjust this is to change the clip position on your main jet needle. THis is accessed from the top of the carb. It is mounted in the center of your slide. Try raising your needle position, by LOWERING the C-clip one notch.(lower the clip to raise the needle)(raise the clip to lower the needle) See if it runs better and cooler. if its better, but not perfect, try another notch lower, to raise the needle. Raise needle = richer Lower needle=leaner/hotter. Also check to be sure you have correct gap and heat range for your plug. 0.5-0.6mm gap

Dec 01, 2010 | 2003 Yamaha YZ 250 F

1 Answer

I have a 1997 YZ250, 2 stroke. it ran well for a fair while. took air cleanerout, cleaned and re-oiled it. all back together and it won't start! continually flooding and fouling plug. even tried tow...


Do you have a 2 piece air filter? Did you oil only the inner filter? If you also oiled the outer filter then you are causing a rich condition in your mixture which is why you're fouling plugs. Remove the outer filter and spray it with filter oil remover and let it dry. Then reinstall and try again. If you are still too rich, then raise the clip on your main jet needle. This will lower the needle a notch from its current position, giving less fuel. Your air/fuel ratio should be ever so slightly rich when it's correct. Do a web search for images "spark plug condition" there are plenty of color charts available to view. Look for the tan colored plug. That's what you're shooting for.

Nov 29, 2010 | Yamaha YZ 250 Motorcycles

1 Answer

I have a 2003 kx 125 and I cant seem to get the jetting right. I keep fouling plugs. My current carb settings are # 35 pilot jet, # 410 main , 2nd clip position from the top of my jett needle and air...


if your still fouling plugs then you still need to go with smaller # on main jet...are you spooging allot out of pipe and muffler? then your to rich still,smaller jet size!!!! 32:1 is a good mix ratio

Sep 04, 2010 | 2003 kawasaki KX 125

2 Answers

2000 yz125 keeps on fouling out plugs


Fouled plugs are typically caused by jetting that is too rich. This could also be from a dirty air filter which can make the bike run rich. Clean up your filter and see if that is it. If the filter is not too bad, you might want to drop a size on your pilot or main.

Another possibility is poor compression - this can make a 2-stroke run richer than normal as the fuel can not be burned properly. Rings don't last long in these 125s. I used to re-ring each week when I was racing 125s.

You might want to run a B8ES plug, too - this is one step hotter and will help the plug from fouling as often.

Feb 01, 2010 | 2004 Yamaha YZ 125

2 Answers

My 87 yz 125 keeps fouling plugs can anyone help? It runs fine on a four stroke plug but is down on power as you can imagine but will also burn out my piston with long use mates have told me float levels...


Keep the correct plug in it.
If the plug looks black, it's due to too much fuel. You need to go smaller on your jetting. (You need to buy these at a dealer)
Your pilot jet will have a number on it. Get the number off of it and try a smaller step smaller. This effects your jetting from idle to 1/4 throttle.
The needle has a clip on it so you can raise the needle (lower the clip) up or down to effect your jetting 1/4 to 3/4 throttle.
The main jet also has a number on it, and this effects your jetting from 1/2 to full throttle.
Do your jetting by plug color. You don't want white (Lean) or black (Rich) You want chocolate brown.
Keep in mind that crank seals can screw up your mixture, as well as worn out rings, dirty air filter, or poor spark.

Oct 09, 2009 | 2003 Yamaha YZ 125

1 Answer

Running rich causing fouled plugs. what to do?


What has been done to the bike resently? If you havent changed anything with the air intake or the exhaust then you my have carb problems.

Sep 29, 2009 | 2005 Victory Hammer

1 Answer

When my 883 warms up it fouls out the spark plugs, as if it is getting to much gas, when I go to accelorate it backfires and bogs down. At idle it runs fine.


Is your 883 fouling plugs AS if warms up or AFTER it warms up? The enricher circuit is designed to be extremely rich in order to start a cold engine. If you allow you engine to "warm up" with the enricher on the entire time during warm up, plug fouling is typical. You should use the enricher to start the engine but disengage it as soon as you can keep the engine running with the throttle. Use the enricher just as little as possible.

If your plugs are fouling AFTER warmup and while riding, your carburator is jetted too rich or your air filter is in need of servicing.

Sep 28, 2009 | 2004 Harley Davidson XL 883C Sportster...

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