O.S. Speed R21GT R21GT Combo Set - Glow EngineThe new O. S. SPEED R21 GT engine has been introduced to compete in the 1 8th scale GT touring category with O. S. clearly looking at the IFMAR World Championship. Performance has been improved over the entire range compared to its predecessor, the 21XZ GT. The crankcase is a refinement of the R2101, which has an excellent battle history in on road racing. The cylinder piston uses 5 scavenged ports plus 3 exhaust ports that have cleared IFMAR
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