Maintenance & Technical > KX250 / KX125

1994 KX125 Carb Boot

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GCrites80s:
I have no idea why someone would put a 380 main in there. Maybe they were used to Yamahas since they want you to make massive main jet changes for some reason. But even then that's a lot. Get that main down to the stock range. Your pilot doesn't seem too far off. Then you can fine tune with the needle clip since that is a huge part of where the bike spends most of its time. You can make a massive difference in spooge with just the needle clip once the jets are nailed. Spooge won't go away until the needle clip and airscrew are done -- which you do last unless you want to change the needle or slide which then come last unless they are the wrong parts. And finding accessory needles and slides for old carbs is difficult and often very expensive.

Now as far as the piston goes, the 93-94s were very bad about blowing up unless you ran race gas. I haven't heard of the '97 piston mod but if it fits properly and lowers the static compression it probably does get the pinging down since they weren't blowing up by then. I can't remember if it was solved for '95 but is was definitely by '96.

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