Maintenance & Technical > KX250 / KX125

Smoky and oily pipe

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mustangfury:
I have a 93 kx 125 and i had that same problem.  I repacked the silencer but it filled up with oil in a couple of hours.  I cut back my fuel mixture to 40:1 and it still had the same problem.  I found that the head gasket was leaking antifreeze into the engine.  It wasn't much at all but I guess the addition of the tiny bit of water to the fuel prevented all of it from burning.  The bike ran great and everything but i had oil flying out the back and getting all over the break caliper and everything.  The way you can check to see if it is the head gasket is to look at the overflow tube for the antifreeze which should run right down the front of the frame and dump out right behind the front fender.  Whenever I reached the upper rpms, a little antifreeze would drip out from the engine putting air into the cooling system.  You will have to have someone else watching to see if it drips but if your bike is set up like mine, the tube drips out onto the front of the fat part of the silencer.  It should leave a stain.  Hopefully your problem is not the same as mine was but the symptoms sound the same.

kx500af:

--- Quote from: Texas Champ. on May 06, 2008, 11:58:47 PM ---I 'd rather run too much oil and deal with goo than by parts and do repairs.....smoke is what they do.....just don't ride backwards and it won't bother you....Don't worry about global warming, check ut the Space Shuttle next time they launch it....when they fix that...I'll fix mine. Besides it's a known fact the our sun it constantly getting hotter , can't fix that ! ....km

--- End quote ---
                                                                                                                                                                                                                                                                         I'm with you lean is mean but fat is where its at :mrgreen:kawasaki always sets the jeting fat at the factory then recomends 32:1 kaw oil! Its no secret that its some of the worst oil there is! with some fine tuning and good oil you can eliminate most of the smoke and goo and still provide good lubrication :-D

jazg:
well i stuck with the 32:1 and changed the oil i was using which seemed to help a little bit. I would never have thought of checking the head gasket! thats hectic, gona have a look!

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