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Fouled plugs when riding it fouls the plug. i see oil leaking around where the exhaust bolts to the cyclinder head. going into throttle it bogs and smokes then when it hits powerband it cleans up and smoke disipates.

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  • Motorcycles Master
  • 8,404 Answers

You dont mention the age of your bike. I would suggest you might want to consider getting a hotter range plug. High mileage bikes may show wear and start consuming oil. A hotter plug can better clean itself at slower speeds. Ask the counter guy at your bike shop for recomendations.

Posted on Dec 03, 2012

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Posted on Jan 02, 2017

  • 71 Answers

SOURCE: 2005 RM 85 fouling plugs every ride.

obviously theres way to much oil in the mix. Speak to your local bike shop and ask them on the best mix for the bike

Posted on Nov 28, 2008

  • 3567 Answers

SOURCE: wondering what the carb settings are for a 1983

The header says it is a 2004 YZ250F. That's a four stroke and gets no oil in the gas. Your 83 model is a two stroke. As far as the oil and gas mix, 32/1 is the proper mix. That's 4 ounces of two stroke oil per gallon of gas.
DO NOT USE STANDARD MOTOR OIL IN THE GAS.

Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Be sure the bolts are tight. Let the float bowl fill then start the engine. Set the idle speed with the idle screw. This process should get you back on the road.


Please rate this solution. Thanks macnevind!

Posted on Apr 04, 2009

  • 3567 Answers

SOURCE: bike bogged down like plug fouled now wont start

Based on the information given, I think you may have a hole in the top of the piston. It sounds like pre-ignition, ( AKA detonation and engine knock ). Pull the cylinder head and check the piston and cylinder head. Sometimes the top outer edge of the piston disintegrates due to the heat. Replace the piston and rings and remove the carbon from the head. Be sure you run 32/1 mix on gas and oil. That's 4oz two stroke oil per gallon of gas. Only use premium gas.

Remove and clean the carb. Be sure the carb mount bolts and carb manifold bolts are tight. An air leak will cause the engine to run hot.

Please rate this solution. Thanks

Posted on Apr 07, 2009

  • 4 Answers

SOURCE: i have a 2003 kx250 i run it with mc1 50:1 and

I would stay with the same heat range(BR8) to stay on the safe side. You didn't say if when you are at the camp sight the bike is cold and just off the truck or warm and right off the trail. But usually alot of 2strokes need to be cleaned out when their being warmed up or they can foul a plug. Get it started, blip the throttle a few times to get some heat in the cylinder and then hold it open until you hear it rev faster and run smooth. Thats usually enough.

Posted on Jun 26, 2009

  • 1 Answer

SOURCE: Rebuilt carbs. flooding rear cylinder

My bike started doing the same thing. I pulled the carbs put new kits in them and it still does the same thing. It does not seem like a spark issue because the fuel consumption would not be this bad, but the floats looked good. The needle valves and seats are new. I am not sure what to think at this point. I even replaced the intake manifolds and flushed my fuel system. It starts good initially. It is almost like the fuel pump is pushing to much pressure and over coming the needle valve. Has anyone seen this before?
Thanks,

Posted on Aug 07, 2009

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1 Answer

Rear spark plug bank is fouled. The 3 in front are fine. What cold be the problem?


I am assuming it is oil fouled rather than fuel fouled. Oil fouling is usually due to valve stem seal leakage. Most engines have the oil return on the cylinder head at the rear. When the engine is shut off, some oil pools at the rear of the head. If the valve guide seals are worn, then the oil will leak around the stem of the #4 valve and eventually foul the plug. If there are no real issues with the engine other than this one, it is usually best to keep a clean plug or two available and swap out the plug periodically when fouling is detected. Then clean the fouled one and keep for reuse later. If it is happening too often, getting the cylinder head reconditioned is a good idea.

Oct 09, 2015 | 2006 Acura MDX Touring

1 Answer

My 97 honda accord is blowing white smoke and running rough then i went to start it now it wont start


Sounds like either a blown motor (rings need replaced) or a bad head gasket or cracked head.
If the rings are bad your car would have felt like it was losing power because the engine will no longer have the same high compression that it's required to turn the wheels. You may have heard your engine knocking or seen a light blue colored smoke coming from your exhaust as a result of your engine burning up oil in the combustion chamber from the rings leaking.
If your head gasket is leaking or your head is cracked you'd likely find milky looking oil when you drain your oil from water/antifreeze being mixed in and noticed a white smoke coming from your exhaust that is actually water vapor coming through the exhaust.
If your car was running rough when you last shut it off try pulling all of your spark plugs and either cleaning them or replacing them all. A bad head gasket or bad rings can both foul spark plugs. A car will run rough with 1 or 2 fouled plugs, but once enough foul it will no longer run at all just sit and crank over. If changing the plugs get's it started for ya, check your tailpipe first for water, if nothing, change your oil. If no signs of water/antifreeze or milky colored oil then it's probably rings.

Aug 27, 2012 | 1997 Honda Accord

1 Answer

97 yamaha yz250 excessive oil in exhaust keeps fouling plug


Hi, Anonymous and the usual suspects are:
1. Oil tank/pan overfilled.
2. Restricted oil return line to oil tank/pan.
3. Restricted breather operation.
4. Restricted oil filter.
5. Piston rings badly worn or broken.
6. Valve guides worn and or seals worn, crushed, missing, or have come of guide and are literally pumping oil through the valve guide.
7. O-ring damaged or missing from oil pump at crankcase junction (also results in poor engine performance). 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.
Dirt Rider Magazine
YZ250 spark plug fouled after every half tank
YAMAHA YZ250 LC Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

May 25, 2012 | Yamaha YZ 250 Motorcycles

1 Answer

I just got a 2000 zr 7 and it has good compression but smokes after a few minutes of running. The far left cylinder fouls the plug, as I said it has good compression, but has been sitting for 3 years, how...


What color is the smoke? A blue-ish smoke is burning oil, a blackish smoke is unburnt gas. If the plug fouled with gas or oil? Does the plug foul at idle, or while riding it? Full throttle? or partial throttle? Answer those questions and you will know if you have a an oil leak in the head or overly rich mixture at idle, or during an open throttle position.

It sounds like too much gas (since you say it has good compression -- did you do a real compression check?). I'd get the carbs synch'ed and make sure they all have their idle mixture screws set correctly.

Dec 16, 2010 | 2000 kawasaki ZR-7

2 Answers

Vehicle bogs down when accelerating at low speeds


I would replace the spark plugs and spark plug wires. Replace them ONE AT A TIME!! Do NOT mix up the firing order of the wires!! When you pull each plug look at it and see if it oil fouled. Some Kia's have an issue with leaking valve cover gaskets that can cause excessive amounts of oil to collect around one or more of the plugs which fouls them out and causes misfires. If this is the case, the only solution is to replace the gasket and the plugs. Please rate me on this answer.

Jun 28, 2010 | 2003 Kia Sorento

1 Answer

Low compression on one side, one fowled plug


A compression leak down test would tell you where the compression leak is coming from, and you should call around to find a repair shop that knows what a compression leak down test is.

A burnt or bent intake or exhaust valve, warped cylinder head or faulty head gasket, or a damaged piston or piston compression ring could cause a compression leak, and a leaking intake manifold gasket that allows oil to enter the intake through the lifter valley could foul out a spark plug, and also it could be a damaged piston or broken piston rings that is fouling out the spark plug.

Jun 06, 2010 | 2005 Ford Explorer

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...

1 Answer

Bike bogged down like plug fouled now wont start


Based on the information given, I think you may have a hole in the top of the piston. It sounds like pre-ignition, ( AKA detonation and engine knock ). Pull the cylinder head and check the piston and cylinder head. Sometimes the top outer edge of the piston disintegrates due to the heat. Replace the piston and rings and remove the carbon from the head. Be sure you run 32/1 mix on gas and oil. That's 4oz two stroke oil per gallon of gas. Only use premium gas.

Remove and clean the carb. Be sure the carb mount bolts and carb manifold bolts are tight. An air leak will cause the engine to run hot.

Please rate this solution. Thanks

Apr 06, 2009 | 2003 Honda CR 125 R

3 Answers

I have a 2002 kawasaki prairie 650. i think i have a blown head gasket on the rear cyclinder. how can i be sure it is a blown head gasket?


Check the seal behind your water impeller there are o rings back there if one of them goes bad you will leak antifreeze into oil, your impeller is run by the oil pump i believe, you should not see oil in the water also your bike will run fine but when hot will foul the plug with water look for white smoke sometimes and the smell of anti freeze on start up
i have a 400 4x4 doing the same thing new piston rings and top end now lossing water but runs great oil looks real thin
took to the dealer to fix this week will let you know how i make out.

Mar 03, 2009 | 1990 kawasaki ZZR 600

1 Answer

The car jerking and chugging and there is oil coming out of the exhaust


sounds like u haven't regularly serviced the car ! If there is oil coming out of exhaust it will most properly be a fouled spark plug or plugs but the reason 4 it fouling plugs would be either leaking valve stem seals or piston rings!!!
Change spark plugs and see if problem rectifies!

Oct 21, 2008 | 2003 Mazda Mazda6

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