20 Most Recent Yard Machines Tecumseh 148cc Front Tine Tiller #21a 251e000 Questions & Answers

http://www.smallenginesuppliers.com/html/engine-specs/tecumseh-engine-specs.html......


this is where i go for parts breakdowns and service literature.......hope this helps.!

Try adjusting the carburetor to a richer mixture.

Ok, that pin is the needle valve. It should move freely, and the spring should attach it to the float. When the carburetor bowl is full, the float pushes that pin up to shut off the gas flowing into it. Otherwise, it would continue to dump fuel into it until it overflows, and you would have gas all over. The engine draws gas through the jet in the bottom of sump that you see sticking into the bottom of the bowl(this likes to get plugged up and keep your engine from running) The spring just kind of sits in there so that if the float moves, it will pull down the pin as it moves.

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http://www.m-and-d.com/scan/se=TECUMSEH/sf=category/st=db/co=yes/op=eq/sp=brands_results/va=category_name=TECUMSEH/tf=sku/ml=20.html