O.S.SPEED R21-M05 2024 Minicars SE Marine Engine

This is the new 2024-edition Minicars Marine Special Edition O.S.SPEED R21-M05 3.5cc long-stroke competition engine!

Features:

• 2024 Updates: New combustion chamber with smaller volume for low nitro & updated piston for easier run-in
• O.S.Speed developed black crankcase with Minicars Marine Laser Engraving
• Black anodized water cooling head with Minicars Marine Special Edition Laser Engraving
• DLC coated & balanced “SG-type” crankshaft (4.5mm balance weights)
• 9-port cylinder liner with 3-port exhaust
• Backplate with steel thrust plate for lower friction and increased durability
• No carb included – choose your own carburetor (15mm diameter neck)

Suitable for competition boats (experience level ”high”):

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

Recommended fuel:

• Hydroplanes: 12-40% nitro fuel with 8% Klotz Original Techniplate + 8% Klotz Benol oil
• Offshore: 12-40% nitro fuel with 8% Klotz Original Techniplate + 8% Klotz Benol oil
• Endurance: 12-40% nitro fuel with 8% Klotz Original Techniplate + 8% Klotz Benol oil
• Don’t run 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.

Specs:

• 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: M5

Included:

• O.S.Speed R21M05 2024-Edition Minicars Marine Engine
• RP7 Glowplug
• O.S.Speed flywheel cone
• O.S.Speed decal
• Printed Manual & partslist