21XZ-M Speed Inboard Marine Engine
Get your racing boat up to Speed!
It's O.S.'s first marine engine under the Speed name, and is designed to deliver the same race-winning performance. Factory tuning optimizes the 21XZ-M's power potential, and it also shares the 21XZ-R's big-bore carb, black anodized crankcase and laser-etched, water-cooled head.
- The crankshaft has DLC (Diamond Like Coating) and is silicone-filled for more efficient intake; two tungsten weights provide optimum balance for low- and mid-speed torque
- The cylinder head is water cooled
- The 21D big-bore carb allows for the use of high-nitro fuel
- An RP7 turbo plug is included
21D big-bore carburetor
Water-cooled cylinder head with special laser markings
- Specifications
- Parts Listing
- Accessories
Stock Number: OSMG1622
Displacement: 0.213 cu in (3.49 cc)
Bore: 0.641 in (16.27 mm)
Stroke: 0.661 in (16.8 mm)
Practical RPM: 4,000-45,000
Output: 2.8 ps/2.76 hp @ 33,000 rpm
Weight: 10.85 oz (307.5 g)
Includes: 21D carb, RP7 turbo plug, exhaust seal ring, head gasket set, dust cap set
Requires: 10-30% nitro boat fuel (20% recommended for break-in), exhaust system, glow plug igniter
Displacement: 0.213 cu in (3.49 cc)
Bore: 0.641 in (16.27 mm)
Stroke: 0.661 in (16.8 mm)
Practical RPM: 4,000-45,000
Output: 2.8 ps/2.76 hp @ 33,000 rpm
Weight: 10.85 oz (307.5 g)
Includes: 21D carb, RP7 turbo plug, exhaust seal ring, head gasket set, dust cap set
Requires: 10-30% nitro boat fuel (20% recommended for break-in), exhaust system, glow plug igniter
Primary Accessories
| Stock Number | Mfr Number | Product Description | Quantity Needed |
| AQUP2230 | AQUP2230 | AquaCraft GrimRacer 30% Boat Fuel Quart | 1 |
Field Equipment
| Stock Number | Mfr Number | Product Description | Quantity Needed |
| DTXP0310 | DTXP0310 | Duratrax Ultimate Glo-Starter C | 1 |
| HCAP3001 | HCAP3001 | Hobbico After Run Engine Oil 2 Fl Oz | 1 |
Optional Accessories
| Stock Number | Mfr Number | Product Description | Quantity Needed |
| AQUB6903 | AQUB6903 | AquaCraft Fuel Tubing Green 3' | 1 |
| AQUB9715 | AQUB9715 | AquaCraft GrimRacer 40x53 Copper-Beryllium Ti Prop | 1 |
| AQUB9720 | AQUB9720 | AquaCraft GrimRacer 40x52 3-Blade Copper-Beryllium Prop | 1 |
| OSMG2703 | 71642060 | O.S. RP6 Turbo Glow Plug Medium On-Road | 1 |
| OSMG2715 | 71642080 | O.S. RP8 Turbo Glow Plug On-Road Cold | 1 |
| OSMG5872 | 72403050 | O.S. Super Can Filter Large | 1 |
| OSMG8876 | 72106300 | O.S. Exhaust Coupler 21 | 1 |
| OSMG9401 | 55500002 | O.S. Lock Washer 3mm | 1 |
| OSMR2976 | 71521000 | O.S. Long Socket Wrench With Plug Grip | 1 |
| OSMR2977 | 71520100 | O.S. Speed Plug Wrench | 1 |
| OSMR3000 | 71410000 | O.S. 10-Piece Speed Driver Tool Set | 1 |
