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If your not going back to injection, then i would recommend 40:1. Either your regular 2stroke oil or like lucas they have a part synthetic blend which i use in my injection systems( personal preference i guess) if you go more expensive full synthetic for lower smoke i was always told to never mix full synthetic with nonsynthetic. 40:1 whichever you choose. Just be prepared to go through fouled plugs more often because at lower idling speeds your using a thicker blend than oil injected which isn’t the same ratio until it’s at higher speeds.very nice looking monty, i think you have the 72hp 640 like my daytona under the hood of that “old girl”.
 
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