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While inheriting the smooth feeling and great fuel efficiency of the previous design O.S.SPEED R21GT, which was well gotten in the European market, the house of GT vehicles, the power feeling in the medium and low speed ranges has been improved by revising the counterbalance of the crankshaft. In addition, the recently designed inner head improves idling performance, and an inner head O-ring is utilized to lower vibration and improve dust resistance. The outer head has been lightened, and has developed into the O.S.SPEED R21GT II with attention to the information. O.S. Engines likewise has a combo set with TB01 (EFRA2042) tuned silencer and MB01-70 manifold.
The crankshaft utilizes 2 tungsten counterweights. We have actually enhanced the mass balance by examining the detailed dimensions.
The inner head has been modified. Improved low and medium speed feeling and idling performance. An O-ring is likewise utilized to lower vibration and improve dust resistance.
The weight of the brand-new outer head, compared to previous design has been decreased. Fins of outer head has been machined.
Geared up with 5 scavenging ports and 3 exhaust ports to meet IFMAR regulations.
Geared up with a double-adjust type 22E(B) GT carburetor. The brand-new venturi is 7.0MM(RED) AL2.
COMBOSET includes TB01 EFRA2042 (T-2060SC) + MB01-70 (M2003SC).
KYOUB013-01
