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This is the complete 21JS Slide Valve Carb used on the
OS Speed .21VZB and OS Speed 28ZX Engines.
Genuine O.S. replacement parts
One complete 21JS Slide Valve Carb
and Red Carb Reducer
One Rubber Carb Gasket
Installing on engine
Length: 0.94" (24mm) approx. including needle and idle stop screw Width: 2.15" (54.5mm) approx. including needle and throttle arm Height: 2.13" (54mm) approx. including needle Diameter: 0.63" (15.9mm) OD of intake (throat) not including
0.35" (9mm) ID of intake (top) including Carb
0.59" (15mm) OD of neck including thermo insulator
(the part that inserts into the crankcase)
0.35" (9mm) ID of neck @ narrowest point (top)
0.42" (10.75mm) ID of neck @ widest point (bottom)
Carb can be identified by its black color and the "21J" marking
on the back side of carb body
– If you need more information, use these O.S. resources –
Parts Compatibility for O.S. Carburetor #21JS Slide 21VZB Speed
This item is a replacement part for the following:
O.S. 21VZ-B V-Spec-T (P) ABC w/21J Slide Carb
Tower Hobbies Has Been Serving Hobbyists Since 1971 • Call 800-637-6050 or 217-398-3636
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