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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Related Questions
What spark plug for a 1974 Yamaha ty 250?
The correct spark plug for this model is the NGK B-7ES.
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How do you know there is spark to the plugs and coil on a 1974' chevy 350 engine?
Connect a known good spark plug to a spark plug wire and ground the threads to the engine while cranking. If there's spark to the electrode you know the coil is good and it's sending current through the wire.
What kind of oil goes in the little oil tank just below your seat on a 1974 Yamaha yz80?
plain 2 cycle oil
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Will a cylinder off a 1975 Yamaha TY 175 fit a 1974 Yamaha MX 175?
I think it will. If you look at biebandit.com and find the oem Yamaha parts for the motorcycles in question and check to see if they are the same part number, if they are then they will interchange. you can crosscheck different years too if you found a 1975 ty 175 cylinder for your 1975 dt 175. So check out bikebandit and see for yourself, they are the next best thing to a Yamaha dealer.
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