927 !!! klotz super techni plate and lately in the 250 the new dumonde tech dtp fully synth mixed at 32:1 / 40:1 ratios. Have ran 50:1 ratios with no issues. I used to ran long time ago golden spectro at 50:1 in the early 80's. Ran super m exclusively at 40:1 in my '86 CR 125 for years.
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