24881824 O-Ring IV/PRC #6H Rubbe (OSMG7372)

While inheriting the smooth feeling and good fuel efficiency of the previous model O.S.SPEED R21GT, which was well received in the European market, the home of GT cars, 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 the detail.

O.S. Engines also has a combo set with TB01 (EFRA2042) tuned silencer and MB01-70 manifold.

The crankshaft uses two tungsten counterweights. We have optimized the mass balance by reviewing the detailed dimensions.

The inner head has been revised, resulting in improved low and medium speed feeling along with enhanced idling performance. An O-ring is also used to reduce vibration and improve dust resistance.

The weight of the new outer head has been reduced compared to the previous model, and the fins of the outer head have been machined.

The engine is equipped with five scavenging ports and three exhaust ports to meet IFMAR regulations.

It features a double-adjust type 22E(B) GT carburetor, with the new venturi measuring 7.0MM(RED) AL2.

The COMBOSET includes TB01 EFRA2042 (T-2060SC) and MB01-70 (M2003SC).