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If it's idling roughly, it needs the air-idle mixture screw adjusted, and if it's popping, it's running lean or dirty (the pilot jet is dirty/too small)... These motors don't need 93 or higher. They run on 85/87 just fine. They're a low-compression, low-performance, air-cooled design. Running high octane is just blowing extra money out the tailpipe. Running higher octane is just putting a band aid on the issue, fix it right and it will run even better than it's running now, but on low octane gas.
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