my son has a 2000 kx 80 which i just put a new $20 iridium plug in and got about 4 hrs out of it and now the plug is dead. just wondering what mix of fuel,what oil and what plug should i use.. bike is all stock jetting...
kx 80 spark plug and fuel mix???
Started by 510te, Oct 26 2009 10:52 PM
2 replies to this topic
Posted 26 October 2009 - 10:52 PM
my son has a 2000 kx 80 which i just put a new $20 iridium plug in and got about 4 hrs out of it and now the plug is dead. just wondering what mix of fuel,what oil and what plug should i use.. bike is all stock jetting...
Posted 27 October 2009 - 03:23 AM
I'm running a BR9EA in my 80 and a 32:1 mix with Silkolene Comp2. My jetting is stock never fouled a plug, never touched the jetting. Actually my son fouled the plug once when he 1st started riding it and that was 2 yrs ago. I've had this bike since 93.
Posted 27 October 2009 - 04:20 AM
First -- you can usually clean a fouled plug with a wirebrush and re-use it.
Second -- The only need for iridium plugs is longer life at high temperatures. If you are fouling plugs, then you are probably running the bike at cooler combustion temps and a regular spark plug will work just fine. I have a "regular" plug in my KX250 and it works just fine and lasts a long time. Go to some place like Advance Auto parts and get a regular NGK plug until you get it sorted out or keep on cleaning the existing plug.
Third -- fouled plug is most likely a result of jetting too rich. Sometimes fouling is also caused when a kid is just getting used to riding and does not ride it hard enough. Maybe just not as hard as the previous owner. As the kid gets used to the bike and rides it harder, the plug fouling tends to cure itself sometimes.
Fourth -- fouled plug is NOT a result of oil choice or oil mixture ratio. Its a result of combustion temperatures being too cool. Cool combustion temperatures are caused by too much fuel, too little air. Clean the air filter, use fresh gas(no more than 4-8 weeks from being pumped). If that does not stop the fouling, then you need to check into rejetting.
Second -- The only need for iridium plugs is longer life at high temperatures. If you are fouling plugs, then you are probably running the bike at cooler combustion temps and a regular spark plug will work just fine. I have a "regular" plug in my KX250 and it works just fine and lasts a long time. Go to some place like Advance Auto parts and get a regular NGK plug until you get it sorted out or keep on cleaning the existing plug.
Third -- fouled plug is most likely a result of jetting too rich. Sometimes fouling is also caused when a kid is just getting used to riding and does not ride it hard enough. Maybe just not as hard as the previous owner. As the kid gets used to the bike and rides it harder, the plug fouling tends to cure itself sometimes.
Fourth -- fouled plug is NOT a result of oil choice or oil mixture ratio. Its a result of combustion temperatures being too cool. Cool combustion temperatures are caused by too much fuel, too little air. Clean the air filter, use fresh gas(no more than 4-8 weeks from being pumped). If that does not stop the fouling, then you need to check into rejetting.
