NIMTEK Carburetor for Tecumseh 640017B 640017 with Gasket Fit engine models OHH45 OHH50 NIMTEK High Quality Aftermarket Carburetor. Fits Parts Model: TECUMSEH 5.5HP 6HP 6.5HP OHH Engines . Replace Tecumseh 640017B 640117 640117B Good at mixing fuel and air. Keep engine running smoothly. Package Include: 1pcs Carburetor & Gasket