OS Engines R21GT II Nitro On Road Engine

The high-performance GT engine has evolved into the next generation! This OS Engines R21GT II On-Road Nitro Engine features a newly developed underhead, cooling-head, and crankshaft, specially made to fit on-road GT tracks. 

Features

• Inner Head Improves Idling Performance
• Outer Head Has Been Made Lighter
• Crankshaft Uses Two Tungsten Counterweights
• 5 Scavenging Ports And 3 Exhaust Ports
• Equipped With A Double-Adjust Type 22E(B) GT Carburetor

Product Information

While inheriting the smooth feeling and good fuel efficiency of the previous model O.S.SPEED R21GT, the power feeling in the medium and low-speed ranges has been improved by revising the counterbalance of the crankshaft. In addition, the newly designed inner head improves idling performance, and an inner head O-ring is used to reduce vibration and improve dust resistance. The outer head has been made lighter and has evolved into the O.S.SPEED R21GT II with attention to detail. We also have a combo set (OSM1DT01) with TB01 (EFRA2042) tuned silencer and MB01-70 manifold.

Specs

Displacement 3.49 cc / 0.213cu.in.

Bore 16.08mm / 0.633 in.

Stroke 17.20mm / 0.677 in.

Output 2.65 ps / 2.61 hp / 34,000 r.p.m.

Practical rpm range 4,000-42,000 r.p.m.

Weight 362g / 12.77 oz.