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Premix Ratio?

Posted: 10:46 pm Jun 19 2014
by HotTrak
I am trying to figure out the optimal premix ratio for my 1982 KDX250. The original service manual I just got says 20:1, but a coworker I ride with suggested that I could run a leaner oil mixture with a synthetic oil. When I went out with him a few weeks ago, I used some of his 40:1, and the bike seemed to perform well. I'm new to 2-strokes, so this is all greek to me so far.

Re: Premix Ratio?

Posted: 11:07 pm Jun 19 2014
by scheckaet
check sig for newb how to and jetting / ratio mix.

Re: Premix Ratio?

Posted: 07:33 am Jun 20 2014
by KDXGarage
Back then, oil was not as good as now, so it may have needed more oil of that type than a modern oil. A couple of the older manuals are that way. With a modern oil, I would suggest 32:1 to 40:1 for your application, depending upon how hard the engine is working.