Maintenance & Technical > KX250 / KX125

1983-84 kx 250

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Tecate250:
And actually the carb off the 83 kx 250 is a round slide Keihin PE carb. I had a carb off a 1988 Tecate 250 4 wheeler. It was a keihin flat side carb but made it so you always had to be on the gas. Even going down hills. That sucks. The carb settings I have is a 160 main jet the other is a 60. It is hard to get jetting down when you have no idea which way to go. I can't afford to buy all kinds of jets to mix match to work.Anyone know what did my piston in?

Hillclimb#42:
Well that's different. Kehin,in '83, is 160 main and 60 pilot,N13 needle. I saw Mikuni and gave spec. on that. That piston had to be runnin lean to melt down. Straight gas accidentally? It happens, but I'm not trying to insult your intelligence, at all. Could it be running too hot? or what oil were you using? My piston looked better than that after my slide hung open and blew it up. Did it act crazy during start-up? or before it died? I assume that it did quit ya'?

Tecate250:
Well actually the bike ran great till about 10 sec befor it blew up. Sounded like a rattle. Anyways It has never seen straight gas. Only the oppisite. Lots of oil. I ran it at 20/1 all the time. I use ultramar gas station oil in all my 2 strokes. I had bad luck with "good" oil. Never had a problem with this stuff. I have 2 pistons that look like that. Both were out of different cylinders and different cranks.

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