O.S.SPEED R21 SHIMO EDITION 3 Combo Set TR03 EFRA2196 & MR05O.S.Engines would like to introduce all new O.S.SPEED R21 SHIMO EDITION 3. Latest collaboration engine with O.S. Team driver Takaaki Shimo.On exhaust section on crank case, using spacer(s) that is provided, the engine will perform more linear from low to top end. Cylinder liner is now 9 port with new treatment of piston for longer life of the engine. The carburetor, to avoid fuel leakage and air in the line, it uses “Dust cover ring” to make the idle better and stable.Exterior of engine uses deep gold outer head, venturi to create all new look. To maximize the performance, combo set comes with TR03 EFRA2196 + MR05.With additional treatment of piston and new matching cylinder will provide longer life than previous 9-port without treatment.“R” connecting rod from R2106 to withstand all the harsh on-road race scenes.Outer head’s all new design fins with improved heat management.We use a Ceramic rear ballbearing for better performance.There are changes on the crank case to adapt spacer(s) provided on the exhaust section. Depending on the tracks and conditions, drivers can choose to use exhaust spacer(s) to change the performance of the engine.For the dust cover, to avoid fuel leakage and air going in with “Dust cover ring”.Specs:
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