O.S.SPEED R21-M5X Minicars Marine SE Racing 3.5cc Engine
This is the O.S.SPEED R21-M5X Minicars Marine Special Edition long-stroke competition engine!
Features:
- 16% EU combustion chamber with smaller volume for low nitro
- O.S.Speed developed black crankcase with Minicars Marine Laser Engraving
- Black anodized water cooling head with new R21-M5X 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% nitro fuel with 8% Klotz Benol oil (Recin) + 4% Klotz Original Techniplate (Synthetic)
- Offshore: 12% nitro fuel with 8% Klotz Benol oil (Recin) + 4% Klotz Original Techniplate (Synthetic)
- Endurance: 12% nitro fuel with 8% Klotz Benol oil (Recin) + 4% Klotz Original Techniplate (Synthetic)
- 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 R21M5X Minicars Marine Engine
- RP6 Glowplug
- O.S.Speed flywheel cone
- O.S.Speed decal
- Printed Manual & partslist
9-port sleeve with a 3-port exhaust
DLC coated crankshaft with improved balance
Steel insert backplate for less friction and more durability
Marine cooling head with Minicars Marine laser engraving
Combustion chamber with smaller volume for lower nitro levels
