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Old 09-30-2006, 08:53 AM   #1 (permalink)
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mix ratio

I have a 69 polaris colt 372 that I picked up this spring and was wondering what the proper mix rotio is, I was told it's 20:1 but with modern oil I can run 40:1, any help would be great.
thanks
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Old 09-30-2006, 09:07 AM   #2 (permalink)
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All the manuals say 20:1.
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Old 09-30-2006, 09:08 PM   #3 (permalink)
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Mix it like RJ said, but if the plugs are all oily and it smokes like mad, maybe try 32:1 or so.
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Old 10-03-2006, 09:44 AM   #4 (permalink)
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thanks for the feedback. I didn't think that the 40:1 idea was right so thanks for confirming what I thaught.
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Old 10-03-2006, 03:47 PM   #5 (permalink)
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with newer good quality oils i found that 40:1 is plenty of oil,mixing any richer than that i kept oil fouling plugs with my 72 340 puma
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Old 10-03-2006, 04:46 PM   #6 (permalink)
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I think I'll just try it at 20:1 and see what happens then go from there.
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Old 10-04-2006, 11:19 PM   #7 (permalink)
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hey,
Don't mix any less than suggested, I siezed my 1970 340 Sachs cause some jerk said I can mix ams oil at 50:1 instead of the book spec of 20:1 . the occasional spark plug is cheaper than a new crank!

good luck,
Russ
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