Maintenance & Technical > KX250 / KX125

Oil spitting exhaust

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mustangfury:
I have a 1993 kx 125.

Every time i ride i have (what i believe is burnt) black oil that spits out of the end of the silencer and the joint between the front fat part of the exhaust and the pipe that goes to the silencer.  Is this normal?  I need to repack the silencer and just wanted to fix the problem if there is one before i repack it.

Thanks.

Another thing:  I had a spark plug recently oil foul.  The top of the piston had a thin even carbon coating.  Is this normal as well or is there something i should do to correct it.  the plug had been running for about 15 hours.  It was the plug that i got with the bike and was not the recomended plug for it NGK BR10EG.  I have the right one NGK R6254k105.  I don't know if that makes a difference.  The BR10EG is a cheaper plug and i didn't know if that could be why it fouled thanks again.

alan:
What is your oil mixture ratio? I think I would be tempted to try a hotter plug like at least a 9 instead of a 10 is really a cold plug.  :-D

mustangfury:
Will i get better performance out of a hotter plug?...  Such as better throttle responce or what?...  Is the NGK R6254k105 recomended by the manual a hotter plug then the 10 and how does it compare to the nine?... Will a hotter plug burn off more of the excess oil? <------- is that what will stop the oil spitting?

Thanks.

alan:
I was making the hotter plug recommendation  based on one of my  2 strokes books. The 10 is the recommended plug for your bike. First you really need to see if you have the correct jetting and oil mixture for the bike. Plug fowling can also be from riding style  and gearing, bogging it down in to high of gear. However oil fowling is usually associated with other problems.

Alan :-D

gowen:
Could have a crank seal leak.

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