This is the O.S. SPEED R21GT for a relatively new category 1/8 GT class. The design of the engine is fully conformed to IFMAR regulation.
IFMAR legal, designed for the 1/8 scale GT class
Newly designed cylinder and piston with five scavenging and three exhaust ports
Newly designed crankshaft with phosphor bronze counterweight for better torque, DLC coated to minimize friction, and silicon filled for lighter weight
New 22E(B)GT double adjustment slide valve carburetor with 7mm restrictor for better response when cornering
Crankcase design modified from the O.S. R2101
The cooling head is designed to optimize heat dissipation and light weight.