For Zama Echo Trimmer Carburetor kit C1U-K29 C1U-K47 C1U-K52 SRM2100 SRM2110 SHC1700 SHC2100 for Power Pruner Trimmer C1U-K29 C1U-K47 C1U-K52 Grass Trimmer Echo Trimmer 12520013312 125200133313 12520013314 12520013311 12520049030 12520046831 GT200 Carburetor fits ECHO GT-200 GT-200EZR GT-2000R GT-2000SB PAS-2000 PAS-2100 PE-2000 PP-1200 PP-800 PPF-2100 PPF-2110 PPSR-2122 PPT-2100Fit for PAS-2000 ECHO GT200EZR GT2000R GT2000SB PAS2000 PAS2100 PE2000 PP1200 PP800 PPF2100 PPF2110 PPSR2122 PPT2100 PAS-2000 PAS-2100 PE-2000 Carburetor, SRM2100 SHC1700 SHC2100 SRM2110, SRM2100 GT2000 GT2100 K29 K47 Echo TrimmersWhen not working well: 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 new 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 new carburetor is based on a brand-new 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 include:1 x 1 carburetor as pictured2 x Gaskets3 x Fuel Line1 x spark plug1 x Air Filter2 x Primer bulbs1 x Oil Filter2 x Fuel Filter