Posted by docmirror on June 14, 2018 at 07:45:07 from (107.213.165.255):
In Reply to: 40:1 or 50:1 gas mix posted by old560 on June 14, 2018 at 07:10:19:
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Use the 40:1 in that weedeater. Although oils have improved, and machines have become more tolerant of less oil mix, it may be an older machine that was designed for 40:1. If you use 50:1 it will work well at idle and low power but may overheat at high output.
Most of the remaining 2 stroke engines out there(except small weedeaters, blowers) use oil injection with a variable ramp mixture set by throttle. Yamaha 2 stroke jet skis set about 60:1 at idle, and gradually increase the ratio to 35:1 at full throttle where upper cylinder lubrication demands are greater. (they aren't made anymore, all 4 stroke now)
Back in the 50s, mix ratios were much higher. 2 stroke drone engines from McCulloch were 20:1. Of course the oil wasn't very good back then so they needed a lot.
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