The O.S. Speed 21XZ-GT is an all-new 5-port engine. It features a newly developed piston and 5-scavenging port cylinder, crankshaft, and crankcase to fit on-road GT track. These parts are totally different from those of SPEC III. The Speed 21XZ-GT has a 7mm carburetor restrictor conform to ROAR regulation. This comes with the T2060SC tuned pipe and the 70mm manifold M2003SC - especially designed for the GT category for better pick-up.
|Displacement:||3.49 cc (0.213cu.in.)|
|Practical RPM range:||4,000-42,000 rpm|
|Max. power output:||2.65 ps /2.61 hp @ 34,000rpm|