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Running too rich on the oil/fuel mixture

Fouling spark plugs

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2004 Suzuki Ozark 250 runs great but after a hour of run time it fouls plug already installed new carb flushed fuel system is there any electrical problems that I don't no about ?


fouling plugs means carbon across the electrode gap or carbon build up down the sides of the ceramic insulation allowing the current to short out rather than spark
,If that is what is happening , it is too rich or burning oil or the auto oil injector for the oil/fuel mixture- as in 2 stroke- is allowing excessive oil into the mixture
you have several options
have that mixture properly adjusted using less oil
check the carby float levels
use multipoint plugs ( same as is used on outboard engines and rotary engines)
or overhaul the engine with new rings and bearings

May 26, 2017 | Suzuki Motorcycles

1 Answer

94 yz 250 fouling plugs bad


Could be fuel or oil fouling. Need to determine which first off. If it is black sooty fouling it is likely too rich also it too rich may be wet.

If oil fouling it is more likely to be much more material fouling and wet sticky material.

A wet, black and shiny deposit on plug base, electrodes and ceramic insulator tip indicates an oil fouled plug. The condition may be caused by one or more of the following: worn pistons, worn piston rings, worn valves, worn valve guides, worn valve seals, a weak battery or a faulty ignition system.

A dry, fluffy or sooty black deposit indicates an air/fuel mixture that is too rich, engine idling for excessive periods of time and/or enrichener usage for excessive periods of time.

A light brown, glassy deposit indicates an overheated plug. This condition may be accompanied by cracks in the insulator or by erosion of the electrodes and is caused by an air-fuel mixture that is too lean, a hot-running engine, valves not seating or improper ignition timing. The glassy deposit on the spark plug is a conductor when hot and may cause high-speed misfiring. A plug with eroded electrodes, heavy deposits or a cracked insulator must be replaced.

A plug with a white, yellow, tan or rusty brown powdery deposit indicates balanced combustion. Clean off spark plug deposits at regular intervals.

Sep 06, 2014 | Motorcycles

1 Answer

Carban fouling


carbon on the plugs is a sign of running too rich (Choke on blocked air filter)). When mixed with oil it can be the sump fumes are excessive indication worn rings. If a 2 stroke it is a wrong fuel/oil mixture. Reduce by running hotter plugs (See plug chart at you spares shop for hotter number plugs)

Jun 22, 2013 | Cars & Trucks

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

John deere 135s won't start briggs and stratton 22 hp engine it is getting spark and fuel and I just put new plugs in because the looked fouled.


Hello,

There are four reasons for fouled spark plugs, 1, You have a resticted air flow ( dirty air filter, or partially engaged choke), so the mixture is rich all the time fouling tghe plugs. 2, You have a poor quality fuel ( old, stale ), and it wont combust/burn hot enough, then fouling the plugs. 3, You might have a piston ring failure causing engine oil to be left on the cylinder wall instead of being wiped back down, and then burning as part of the combustion process. Thus burning and causingg a rich condition again, and fouling the plugs. Then finally number 4, low engine compression. This is again caused by worn cylinder walls and worn piston rings, causing compressed air/fuel mixture to leak past the rings into the crankcase, and when the fuel/air mixture is compressed then ignited, some of the air needed to ignite the fuel has escaped, and thus a rich condition again, fouling the plugs.


Determining which of the Four are causing you fouling is your next step.

Hope this helps

Nov 12, 2010 | John Deere 420,1020,2010,2020,2510,2520...

1 Answer

It's flooding how can i fix it


Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check cylinder compression


Overfuel or 'rich' condition
Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check Air filter for fuel saturation
4) Allow engine to run for 5 minutes remove to excess fuel from muffler
5) Fuel mixture ratio: Make sure the oil mix is per your manufactures recommendations
6) If after the above the engine is still smoking and blubbering:
Adjust carb mixture screws to a 'less rich' setting
*NOTE: only move mixture screws 1/8 of a turn at a time,
and try operation before any more adjustment

Nov 26, 2009 | Husqvarna 155bt Gas Backpack Leaf Blower

1 Answer

Chain saw starts and runs once or twice, 3rd time will not start again, spark plug wet - should i replace carburetor?


Most carburetors can be rebuilt and solve most problems, but occasionally the debris is into places where cleaning is not possible, and must be replaced. I would try some basics first though.

Overfuel or 'rich' condition
Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check Air filter for fuel saturation
4) Allow engine to run for 5 minutes to excess fuel from muffler
5) Fuel mixture ratio: Make sure the oil mix is per your manufactures recommendations
6) If after the above the engine is still smoking and blubbering:
Adjust carb mixture screws to a 'less rich' setting
*NOTE: only move mixture screws 1/8 of a turn at a time,
and try operation before any more adjustment

Nov 12, 2009 | Poulan Pro 16-Inch 38 cc Anti-Vibration...

1 Answer

I have an Echo Backpack Blower PB46-LN that is leaking black oil out of the muffler, its easier to start when its cold but when its hot it difficult to start, also I dont even need to prime it to get it to...


This senerio is an 'over-rich' condition, most often caused by an improper fuel/oil ratio mix, and the 'exhaust screen' or 'spark arrestor' on the outlet of the muffler is plugged. Cleaning the screen may be all that is needed to correct the problem. **Make sure this screen is clean, and operate engine for at least 5 minutes before making any of the suggested adjustments below.

Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated

Overfuel or 'rich' condition
Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check Air filter for fuel saturation
4) Allow engine to run for 5 minutes to excess fuel from muffler
5) Fuel mixture ratio: Make sure the oil mix is per your manufactures recommendations
6) If after the above the engine is still smoking and blubbering:
Adjust carb mixture screws to a 'less rich' setting
*NOTE: only move mixture screws 1/8 of a turn at a time,
and try operation before any more adjustment

Nov 12, 2009 | Echo Garden

1 Answer

Ryobi lawn hornet mk2


Change your spark plug
If the fuel oil mixture is too oily it will foul the spark plug and no cleaning will get it right.
If there is a lot of oil in the crankcase it may foul the new spark plug so another new one is needed

Aug 10, 2008 | Electrical Supplies

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