Maintenance & Technical > KX250 / KX125

Pre mix

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pkbarbiedoll:
I used Castrol's 2-stroke premix all last year, mixed at 44:1.. my bike never smoked.  Yesterday though I drained everything out and filled up with 927 castor mixed at 44:1, and now my bike smokes.  rings don't go bad after 30 minutes, so the change in oil is what is causing the extra smoke.    my question is what should I mix the castor at so my bike won't smoke so much?

eprovenzano:
The best thing you can do, it to select a quality oil, select your premix level, jet as needed, and stick with it.  I've recently switched from Yamalube to Amsoil.  It required jetting adjustments, but I happier with the change.  Like you, I used Yamalube for years, with no problems, I just wanted to got to synthetic oil.  I stayed with my 40-1 ratio, but I too had a tab bit too much smoke.  I ran that way for a couple of rides, no fouled plugs, just too much smoke for me.  So I adjusted the jetting to reduce the smoke, and all is well.

I'd run as is for a few rides, if it keeps up, adjust jetting.

kx_rider53:
He wins ^^. Its is all about jetting. Pick an oil and ratio and jet for it.

Wizzy214:
yep figure out your jetting.

i use mobile 1 racing 2t @ 32:1 - 40:1  with little to no smoke after warmed up. in my 99 250

Utah:
I hear a lot of good things about klotz. Think I'll give it a try this season. Even supposed to smell pretty good!

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