O.S.SPEED R21-M06 Marine Engine

O.S.SPEED R21-M06 - 2025 Minicars Marine SE Racing 3.5cc Engine

• New DLC coated & balanced R21 Euro-II crankshaft with more timing
• New 9-port cylinder liner with 3-port exhaust
• New piston with 3 oil-grooves
• New Ceramic main ball bearing
• New Reinforced "R" conrod
• New RP6 Turbo plug (instead of RP7)
• O.S.Speed developed black crankcase with Minicars Marine Laser Engraving
• Black anodized water cooling head with Minicars Marine Special Edition Laser Engraving
• Backplate with steel thrust plate for lower friction and increased durability
• No carb included - choose your own carburetor (15mm diameter neck)

• Hydroplanes
• Offshore (with gear deduction)
• Endurance (with gear reduction)

• Hydroplanes: 12% nitro fuel with 8% Klotz Original Techniplate + 8% Klotz Benol oil
• Offshore: 12% nitro fuel with 8% Klotz Original Techniplate + 8% Klotz Benol oil
• Endurance: 12% nitro fuel with 8% Klotz Original Techniplate + 8% Klotz Benol oil
• We don't recommend running the engine with less oil than the above recommended levels. You may add more recin/castor oil (Klotz Benol) in extreme conditions and heavy loads.

• Displacement: 3.49cc
• Bore: 16.08mm
• Stroke: 17.2mm
• Crankshaft dia: 14mm
• Practical r.p.m. Range: 4.000～43.000
• Output: 2.76hp @ 35.000r.p.m.
• Weight: 265g
• Water Cooling Nipple Thread: M5x0.8

• O.S.Speed R21-M06 2025-Edition Minicars Marine Engine
• RP6 Glowplug
• O.S.Speed flywheel cone
• O.S.Speed decal
• Printed Manual & partslist