This is a replacement thermo carb insulator gasket for O.S. 20K/21C/20L/21H/21J carburetors. This is the small gasket that goes between the carburetor and the engine crankcase to stop heat transfer from the crankcase to the carburetor. This fits on the O.S. 21 VZ-B V-Spec and 30 VG engines.
This product was added to our catalog on April 19, 2006
- JQ Products THE Engine
- O.S. Engines .21 B2101 Speed
- O.S. Engines .21 Speed V-Spec
- O.S. Engines .21 VZ-B V-Spec
- O.S. Engines .21 XZ-B
- O.S. Engines .21 XZ-B Speed
- O.S. Engines .21 XZ-B Speed II
- O.S. Engines .21 XZ-B V2 ABC VII
- O.S. Engines .30 VG
Jay Wednesday, Jun 2 2010 (about 15 years ago) O.S. Thermo Carburetor Insulator 20K/21C/20L/21H/21J If you get this stuck in a motor, heat up the engine to running temp and work the carb in and out to remove it. 1 customer found this review helpful. View all reviews





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