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Fouling plug fouling bottom plug,plenty of spark ,new plugs only running on top cylinder

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  • Motorcycles Master
  • 8,404 Answers

Get one heat range higher plug for your motorcycle. If it is fouling, Im guessing this is a high mile motorcycle. You dont say anything about make, model, year or miles.

Posted on Dec 06, 2012

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

rselvy
  • 83 Answers

SOURCE: kawasaki kx 250 fouls spark plug in 30 minutes

You definitely need to change the oil mixture to at least 40:1, use a good grade of 2 stroke oil. You do NOT need to return the bike. I'd highly recommend using an NGK B7EV spark plug. A hotter plug will stop the premature fouling. I would not recommend you decrease the oil to 50:1 because you are essentially robbing the engine from adequate oiling for the piston, KIPPS valves and the bearings. The hotter plug will make a huge difference but remember if he gets to the point where he is able to ride the bike to it's potential he will need to run the cooler plug, B8EV or B9EV. You can also use a cheaper plug in the same heat range, B7ES or B8ES. Those plugs should cost about $1.25 ea. and are an affordable cost of running the bike. It's not uncommon to replace a spark plug frequently, it's the nature of the 2 stroke engine.

Posted on Dec 08, 2008

  • 5 Answers

SOURCE: xn 85 fouling spark plugs

i have a xn 85 model 86 and it was in a garash for a many years so the rubber of the valve seal are wet and no stop the oil, in my case was the 3rd cilinder i change the injector and continued leak the 3rd. when i change the seals tha problem sold good.......................have a good repaire.

Posted on Jan 06, 2009

  • 3567 Answers

SOURCE: xr200

It sounds like the previous owner liked to tinker with the carb. I would pull the carb, CLEAN IT and check what size jets are in it. #115 is the stock main jet. #38 was the stock slow speed jet used that year. In the center of the slide, check where the clip is set on the needle. Position the clip mid- range of adjustment. If the bike bogs when you open the throttle, move the clip down one notch. Two notches may be needed but start with one. Be sure the owner has not lost the needle jet holder, part #16 on the parts diagram I am sending you to. Both the air and idle screws start at one & one half turns. Look at the tips of the adjusters. If they have a "ring" mark or depression mark where they were screwed in too tightly, then the screw(s) and jets should be replaced. These are adjusters and not really a screw. Seat them LIGHTLY then come out 1.5 turns.

Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx Go to the "CARBURETORS" tab to see the assembly. There is a slight chance the OHC may be one tooth out of proper position. We will check that after the carb has been put in order and tested.

I hope you will be able to rate this answer as "Very Helpful". Thanks

Posted on Jun 15, 2009

  • 132 Answers

SOURCE: spark plug fouling when cold starting

sounds like the carb wants cleaning and re-balancing

Posted on Jun 19, 2009

  • 6 Answers

SOURCE: My 2001 Intruder 1500 is running rough and fouling

you may have bad gas  or mis adjusted carb

Posted on Jul 03, 2009

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1 Answer

What is the spark plug gap why is 1 of my exhust pipe hot and the other is not


Dave:
Your #1 cylinder ( the front cylinder) is not firing. It could be that the spark plug is fouled or improperly gapped, or the carburetor is not delivering gas to the cylinder. pull both spark plugs Clean the plugs and gap them. The gap should be about 0.035 In. (thirty five thousandths). Reconnect the wires to the spark plugs. Lay the spark plugs against the outside of the cylinders with the metal part of the spark plug body touching the cylinder (creating the ground part of the circuit). push the starter and look for spark at both spark plugs. If you have spark at both plugs, put them back in and start the bike and check the exhaust pipes to see if they are both hot. If one is still cold, the carburetor for that cylinder is not delivering gas. Could be a kinked or clogged fuel line, disconnect the fuel line from that carburetor and see if gasoline flows out. If gas flows out, the carburetor needs to be tuned or removed and cleaned.

Jul 12, 2015 | 1998 Suzuki VZ 800 Marauder

1 Answer

Spark plugs foul immediately


Fouled plugs may be caused by oil leaking into the cylinder. Does it smoke when running (cold), are you using up the crank oil. Black smoke is excess gas comsumption, blue smoke is oil burning. If your plug is fouled with black carbon, you are most likely running to rich.

Apr 07, 2014 | Briggs & Stratton Briggs Stratton Vanguard...

2 Answers

Bought it a couple months ago with 44k mi. now has 77k mi. started missing, running rough, severity is worse about 40mph. tried putting in a set of plugs, didn't help. noticed #5 plug soaked with fuel,...


First you say #5 doesn't appear to be firing

Then you say the coil pack is okey and you have spark

Also worse about 40 mph but plenty of power
You can't have it both ways

You have an issue with cylinder #5 causing a
drivability problem

I would have thought that you would have checked
for a leaking injector on #5 and a misfire also.

You will have to pick the way you approach this

You really need to current ramp the injector voltage
compared to the others
Switching the injector to another location will be
time consumming and a new one expensive.

Jan 28, 2011 | 1993 Mercury Grand Marquis

1 Answer

Why is my car still misfireing after in cylinder 4.I have changed the spark plugs and wires and its still running bad


There is evidently something inside the cylinder fouling out the plug. When you take the plug out there should be some residue on it. There should be no oil nor coolant in the cylinder, both can foul out a plug. I assume that you closely inspected the coil connections before you stuck the new wires in. Those also can get corroded away meaning no good connection to the plug wire.

Oct 08, 2010 | 2000 Saturn SW2

1 Answer

Lawn mower dieing pulled spark plug (oil on plug) cleaned will start and run for alittle bit. clean plug again same result


Oil on the plug might mean you have excessive cylinder wear and it is causing oil to get into the engine and foul the plug.

You can try to a new plug and see if it runs longer before fouling but realistically you are probably looking at getting a new mower very soon.

Aug 08, 2010 | Briggs & Stratton Garden

2 Answers

Centre spark plug oiling up and throttle response very eratic at low revs becoming smoother when running higher than say 3000 revs, but still a very jerky ride - used to be very sweet!


Hi,oil conducts electricity cause short circuit in spark plug(no spark or little spark).replace it with new spark plug if problem still exist then oil ring on piston worn out too much allow oil come up to wet your spark plug.oil ring need to replace.
good luck!!!!!!!!!

Feb 24, 2010 | 1996 Triumph Triumph Thunderbird

1 Answer

Only runs on one cylinder


check the compression of the cylinders first to make sure the top end is not blown, if all goes well then proceed to see if the spark plugs are good, this can be done by looking to see of the plug is soaked and smells of gas, if that is the case then the plug is fouled which would cause on cylinder only to fire, also make sure both ignition coil wires have spark,

Nov 27, 2009 | 2008 kawasaki Ninja 250R

2 Answers

Gets hot, sizes up.


Clean carb. Pull apart and soak in carb cleaner. Blow dry with air nozzle. Make sure air filter is clean and plenty of air. Make sure spark plug is not gapped wrong and running to hot. Make sure oil/fuel mixture is accurate

Nov 12, 2009 | Poulan Wild Thing 2375 18" Gas Chain Saw...

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

1 Answer

Spark Plug Fouling


fix the root cause . probly needs valve guid seals.

Mar 10, 2009 | 1987 Pontiac Firebird

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