O.S.Speed R21-M06 Marine Racing Engine This is the new 2025-edition Minicars Marine Special Edition O.S.Speed R21-M06 3.5cc long-stroke competition engine. The R21-M06 has a new piston & liner, new conrod, new crankshaft & ceramic main ball bearing compared to the previous R21-M05 '24 engine.
New Features: • DLC coated & balanced R21 Euro-II crankshaft with more timing • 9-port cylinder liner with 3-port exhaust & piston with 3 oil-grooves • Ceramic main ball bearing • Reinforced "R" conrod • RP6 Turbo plug (instead of RP7) |