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It does on a 50cc. The engine barely has enough juice to turn 15W40 oil over in the crank case when it's cold; so you'd have to up the idle to keep it running.
at cold it might barely keep itself alive, but when the oil heats up, the engine idles at higher RPMs.
Lighter oil allows you to lower the RPM when the engine is cold; so that when the engine is hot, idle RPM doesn't shoot through the roof.
Not an issue with 100+cc engines, but it is with a 50cc.
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