Maintenance & Technical > KX250 / KX125

'93 KX125 - 1st gear WOT issues

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AZdirtRiDeR:
I don't understand what I'm feeling.

1st gear won't wind out.  It almost feels like it's choking.  I pulled the plug it's a little fouled but not bad.  I clean and replace it, but still no top end RPM in first gear.

I shift into 2nd and it's better, 3rd and up it's fine, I can wind it out, but 1st gear sucks.

Then on the way back to the truck[wife's van :)] it seems better, but then again, cold it runs like crap.

It doesn't make sense to me unless this model just runs better HOT.

Am I missing something?

FPMXer:
All bikes run like crap when cold, let it warm up before you take off and all should be good.

AZdirtRiDeR:
It was the jetting...

kx666:
for best performance it is recomended to change jetting every 3 degrees.
but i am a little lazy, i have summer jets and winter jets and i am happy with that

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