[tips] Spark plug color

[BARUA]

:shock: A white coloured plug is caused by engine overheating. Failure to repair this engine will result in severe engine damage. Common causes for this are:
Incorrect spark plug (too hot heat range).
Low octane fuel.
Timing is not set properly.
Cooling problems, (dirty cylinder fins, no or low water if water cooled, low or no engine oil).
Carburettor air/fuel mixture is too lean (too much air).
Leaking crankshaft seals, no oil, base or head gasket leaks, or crankcase leaks on two stroke engines

 

[BARUA]

This plug has ash deposits which are light brownish deposits that are encrusted to the ground and/or centre electrode. This situation is caused by the type of oil used and adding a fuel additive. This condition will cause a misfire. This can be also caused by changing oils in midstream.

 

[BARUA]

 

[BARUA]

:x Pre-ignition, which will usually look as a melted centre electrode and/or ground electrode. Check for incorrect heat range plug, over advanced timing, lean fuel mixtures or even hot spots or deposit accumulation inside the combustion chamber

 

[BARUA]

:lol: A black dry fluffy coloured plug is caused by deposits from a carburettor that is running too rich (too much fuel), or excessive idling on some engines. Black smoke coming from the exhaust is a sign of a rich air/fuel mixture. The rich air/fuel mixture must be repaired before installing a new spark plug. Common causes for a rich air/fuel mixture are:

dirty air filter.
air mixture screw or carburettor needs adjusting.
choke is sticking.
carburettor float height is out of adjustment or float is sticking open.

 

[BARUA]

:shock:

 

[BARUA]

Sustained Pre-ignition, which will usually look as a melted or missing centre electrode and/or ground electrode as well as a destroyed insulator. Check for incorrect heat range plug, over advanced timing, lean fuel mixtures or even hot spots or deposit accumulation inside the combustion chamber

 

[tsunami]

Sifu hard to make our spark plug same as that pic

 

[CrescentScythe_86]

dear traxxas, i already adjusted my pilot follows the factory setting, after 2days i checked the plug...and the color is light grey and the side of the seramic was lilbit white spot. then afta that i turn my pilot to 2turn. but ididnt check it yet. my motobike make a noise, knocking. it become more louder if engine become hot. y could this happen? my engine also make a noise sounds like treet..treett..treet. Might be something wrong with my exhaust piping? my milage now is 9345km. i didnt do the valve clearence yet.. i change my oil shell VSX 15W-50 and its oil filter and also s.plug every 4000km. can u please gimme some advices?

 

[aichan]

how about this one ?

http://i56.photobucket.com/albums/g190/aichan7/my Mx/busi.jpg

which condition was it ?

 

[sniperyaz]

sir aichan looks like your spark plug under category # 15 or 16 which is best