Question about 2007 Yamaha Ybr 125

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Checked my spark plug today and found the tip to have browned of is this a problem with the mixture and how do I fix it?

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I never heard of a brown plug. It should be black, blue, crud, or oil. The mix will turn the plug blue from being too rich, burning hot, and of course the black from soot or carbon, from being lean, Then the oil you don't want to see, but changing plugs is a must. I get great performance from Autolite plugs in my bike. 10 times better than champions. Clean the air filter while you are at it. Hope this helps.

Posted on May 25, 2010

Testimonial: "I read up about it and found it was because the mixture is running rich so looks like i have to read up on fule injection systems thanks for your help"

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There are countless sites out there with pictures nad remedies, here's 1 without pictures.

http://www.ehow.com/how_4917174_diagnose-spark-
plug-problems.html

Posted on May 25, 2010

  • Susan Price May 25, 2010

    Sorry the link did not go thru.. Just do a search on Spark Plug Diagnosing

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93 harley FXR made loud pop from exhaust then started after second attempt. Went on 50 mile ride came home and parked then when I went to put the bike away for the night bike made loud pop again then...


Popping (backfiring) is usally a sign of one ot two things: either the fuel mixture is too rich, or you have a weak spark in one or both cyclinders. Pull a spark plug and look at the tip. If the electrode is coated with black carbon, the the fuel mixture is too rich. Assuming your air cleaner is not plugged with debris, this requires resetting jets in the carburetor. If the culrpit is a weak aprk, replace the spark plugs and see if that fixed the problem. If not, have your coils and ignition wires checked out.

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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.

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if the plug is white you are running lean.
plug should be tan to medium brown.
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I have just changed out a 1200 vw motor and set the timing at 6 1/2 the motor runs good.but when I test drive it it studers ,is low on power


IF EXHAUST BACK FIRES MIXTURE IS TOO RICH-TURN SMALL CARB SCREW ANTICLOCKWISE A TOUCH WITH ENGINE HOT AND TEST DRIVE.
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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
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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

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Will not start has a spark,but a lot of fuel in the muffler cleaned the screen and emptied out fuel ..do I need to add new fuel ..carb cleaner ?


Yes, add fresh fuel. You may need to crank the engine while holding the throttle at wide open and no choke to start unitll excess fuel is burnt.

Overfuel or 'rich' condition
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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
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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,
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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

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1 Answer

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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

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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

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