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Old 05-11-2010, 03:46 PM
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Question Oil/Gas Ratio - Bypassing Injection System

I'm rebuilding a 1989 Polaris Trail Boss 4x4 250 2-stroker and decided to plug the oil injection system ... going to use a fuel/oil mixture instead.

While down at our local Polaris dealer for some parts, I asked the service manager if he knew what the oil to fuel ratio was for this machine. After much referencing he was unable to tell me ... just thought maybe it was 32:1. After all my work, I'm not ready to chance it ... DOES ANYONE HERE KNOW FOR SURE?

Sure would appreciate a definitive answer.

Thanks guys!

John
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Old 05-11-2010, 04:19 PM
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we run them at 52:1
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Old 05-12-2010, 08:59 PM
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Thanks 'The Kid', but that sounds a little to low ... so I asked the engine guy on this forum - TinkerMan - and he gave me the following ratios:

32:1 - Break-In Ratio
40:1 - Normal Engine Ratio


Thanks TinkerMan!
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Last edited by Observer; 05-12-2010 at 09:02 PM.
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Old 05-14-2010, 09:31 AM
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Doesn't the oil injection system do more than just add oil to the fuel? I thought it supplied oil to the crank and rod bearings as well (at least on the water cooled 350's and 400's).
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Old 10-15-2011, 03:45 PM
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Anyone know if you can just run premix or will it hurt anything else?
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