Plugs
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originally posted by culmination
READING SPARK PLUGS
Q: Is there any place on the Internet where I can see pictures of spark plugs and learn how to read them?
A: I don't know of such a guide so I put one together for you, of the five popular spark plug patterns for two-stroke engines.
Heavy Carbon
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This plug has heavy carbon build up. This engine had a blown crank seal on the tranny side of the crank. Tranny oil entered the crankcase and was burned in the combustion chamber. Engines like this will billow thick blue smoke out the exhaust pipe.
Wet Fouled
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This plug is wet fouled. The spark plug's heat range is either too cold or the carb jetting is too rich.
Sand Glazed
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This plug has a shiny appearance. The engine had a problem with air filter sealing. Sand entered through the filter and into the engine. The high combustion temperatures caused the sand to melt and form glass around the spark plug.
Melted Aluminum
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This plug has tiny globs of aluminum packed around the insulator. The engine suffered a meltdown from ignition timing that was advanced too much. The heat could not transfer from the spark plug fast enough and the center of the piston melted causing the molten aluminum to collect on the plug.
Perfect Color
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This is a perfect plug. The color is mocha brown so the carb jetting is optimum. The first three threads are black signifying the plug's heat range is matched to the application. There are relatively low deposits considering that this engine was run on regular pump petrol.
READING SPARK PLUGS
Q: Is there any place on the Internet where I can see pictures of spark plugs and learn how to read them?
A: I don't know of such a guide so I put one together for you, of the five popular spark plug patterns for two-stroke engines.
Heavy Carbon
This plug has heavy carbon build up. This engine had a blown crank seal on the tranny side of the crank. Tranny oil entered the crankcase and was burned in the combustion chamber. Engines like this will billow thick blue smoke out the exhaust pipe.
Wet Fouled
This plug is wet fouled. The spark plug's heat range is either too cold or the carb jetting is too rich.
Sand Glazed
This plug has a shiny appearance. The engine had a problem with air filter sealing. Sand entered through the filter and into the engine. The high combustion temperatures caused the sand to melt and form glass around the spark plug.
Melted Aluminum
This plug has tiny globs of aluminum packed around the insulator. The engine suffered a meltdown from ignition timing that was advanced too much. The heat could not transfer from the spark plug fast enough and the center of the piston melted causing the molten aluminum to collect on the plug.
Perfect Color
This is a perfect plug. The color is mocha brown so the carb jetting is optimum. The first three threads are black signifying the plug's heat range is matched to the application. There are relatively low deposits considering that this engine was run on regular pump petrol.
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4,657 Posts
heres a post from ngk . .. this should help some too
http://www.ngksparkplugs.com/techinfo/spark_plugs/faq/faqread2.asp
http://www.ngksparkplugs.com/techinfo/spark_plugs/faq/faqread2.asp
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20,271 Posts
wats the exact name of those NGK colder plugs? im gona buy them soon and dont knoe exact name. NGKbre-7 or soething like dat
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9,779 Posts
wutang, can you fix the pic please, i wanna see
There's not a "name" for them. Basically they would be either one or two steps colder. Here's the guidlines for NGK plugs (I believe Denso is the way).asianpride559 said:
Your stock plug part number is ZFR5F-11. The "5" is your heat range. If you wanted a plug that was one step colder, you would look for ZFR6F-11.
There will be less insulator area around the electrode (the white ceramic) on a "colder" plug. This is the part that collects most of teh heat for transfer.
Hope that helps you out a bit(I didn't want to go too much in detail).
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279 Posts
Damn it - shop effing up my plugs
:mad I just got a major service done on my car in prep for my trip cross country. Well they pulled the plugs to check them and said they're fine.
What they failed to mention is that the mechanic cracked the ceramic when putting them back. :mad
the car was hesitating on occasion and I said "you know, it feels like the car is running at about 3/4...."
So I checked all the plugs and sure enough this is what #4 looked like
![]()
I tried to get the pieces out but couldn't. I just gave the cable as good a seat as I could and I 'll let them clean up their mess on monday. If they drop so much as a spec of ceramic in the cylinder they're buying me a brand new K20. (this is a b18C...I would just want to milk them for all they're worth.)
:mad I just got a major service done on my car in prep for my trip cross country. Well they pulled the plugs to check them and said they're fine.
What they failed to mention is that the mechanic cracked the ceramic when putting them back. :mad
the car was hesitating on occasion and I said "you know, it feels like the car is running at about 3/4...."
So I checked all the plugs and sure enough this is what #4 looked like
I tried to get the pieces out but couldn't. I just gave the cable as good a seat as I could and I 'll let them clean up their mess on monday. If they drop so much as a spec of ceramic in the cylinder they're buying me a brand new K20. (this is a b18C...I would just want to milk them for all they're worth.)
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23,755 Posts
say hello to hoverscottigee said::mad I just got a major service done on my car in prep for my trip cross country. Well they pulled the plugs to check them and said they're fine.
What they failed to mention is that the mechanic cracked the ceramic when putting them back. :mad
the car was hesitating on occasion and I said "you know, it feels like the car is running at about 3/4...."
So I checked all the plugs and sure enough this is what #4 looked like
![]()
I tried to get the pieces out but couldn't. I just gave the cable as good a seat as I could and I 'll let them clean up their mess on monday. If they drop so much as a spec of ceramic in the cylinder they're buying me a brand new K20. (this is a b18C...I would just want to milk them for all they're worth.)
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23,755 Posts
what shop is it? and where are they located?scottigee said:
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