and high quality Highly matched to the original device Sturdy and durable, long service life Part Number:640349 640052 640054 640058 640058A Material:metal Color: Silver Fitment: For Tecumseh 8 9 10 HP Craftsman Toro Ariens 824 Snow Blower For Oregon 50-659 Stens 520-926 Carb For Carburetor for Tecumseh 640349 640052 640054 hmsk80 hmsk90 lh318sa l358sa 8hp 9hp 10hp snow blower generator chipper carburetor When the work is not good: 1. Oil circuit problem: fuel tank to carburetor oil supply is not smooth. Check whether the oil circuit is open, whether the tubing is choked or not, and whether there is foreign matter blocking. 2. The idle speed is too low: the carburetor can not match the machine completely, and the old machine may need higher idle speed because of the aging or wearing of various parts. The carburetor is based on a brand- machine matching test, the test parameters are qualified after the factory, unable to meet the needs of each customer's different parameters. This situation needs to increase the idle speed: the valve screw at the red circle arrow (clockwise adjustment of 1-2 rings) 3. The negative pressure hole is blocked: the negative pressure hole is blocked also cause the extinguishing situation. Check whether the negative pressure hole in the red circle is blocked when it is installed. Package Contents: 2 x Carburetor 4 x Clamps 2 x Spark Plug 2 x Gasket 2 x Fuel Line 2 x Fuel Filter 2 x Cut-off valve 2 x Assembly