When I brought my snowblower carb to my local repair guy not too long ago, he recommended the following:
1. For any small engine, buy at least 89 octane.
2. When you buy your gas for your small engines, add a small amount of fuel stabilizer. Always.
3. For off-season storage, drain as much fuel as you can, add stabilizer to the tank. Run the engine so the stabilizer gets into the carb.
4. To prepare for on-season use, fill the tank with some nice fresh fuel. Don't add stabilizer to this, as there is some still in the tank from storage.
5. Make sure you use the higher octane fuel with stabilizer.
He recommended this for all small engines. 4-strokes (snowblower, lawn tractor/mower) as well as 2-strokes (chain saw, weed wacker etc).
Ever since I started doing this I have not had any problems. *knocking on wood*
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Getting ready for winter!
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