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Year of motor and ratio of oil to gas mixture

baxter

New member
"I have a 75hp chrysler motor

"I have a 75hp chrysler motor with serial number 757HA and 8412 below those numbers. Can anyone tell me what these numbers mean or anything about it.
Secondly I was told my mixture was one part oil to five part gas, then someone else said it was one part oil to three part gas. Anyone know what or which is right?
I appreciate the feedback. Thanks"
 
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