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Normally a thirty thousandths gap will serve just fine. Make sure you have the correct plug, and then obey the commandments for making two-stroke engines reliable: Clean air Clean fuel Good quality (or better) air-cooled two stroke oil. No "outboard two-stroke oil" - that's for water cooled engines.

If you've been running without an air cleaner, there will be plenty of dirt to live with for a while, and that will end up "bridging" the spark plug gap and the bike will refuse to run properly, or maybe at all.

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โˆ™ 2015-08-23 14:50:40
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Q: What is the proper spark plug gap for a 1974 Yamaha TY80A?
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