OSMG1720, 21XM VII .21 Air Cooled Outboard Marine Engine
Engineered to take down the competition!
Take down the competition with the 21XM Version II Outboard Marine engine from O.S.! It retains many of the features found on the successful 21XM, including the 20J carburetor and #8 glow plug. New additions include efficient air cooling, a larger muffler and more!
Designed expressly for small and medium-size outboard boats.
Cooling the head with air is more reliable than water cooling, and prevents overcooling.
The larger muffler boosts engine power for greater speeds.
Retains many of the features of the highly successful 21XM.
20J carburetor.
Installed aluminum tilt transom mounting plate.
Assembled outboard unit with flexible propeller.
Blue anodized aluminum heat sink head.
1.7 in. (42 mm) carbon fiber propeller.
#8 glow plug.
Cooling the cylinder head with air is more reliable than water cooling, and prevents overcooling. It also adds the benefits of simpler construction and less maintenance.
While being larger than the muffler used with the .21XM, the VII's muffler is still just as easy to tune, still detachable for easier maintenance, and more responsive than a tuned pipe.
Product Specifications
Manufacturer #
13941
Benchmark Prop
42mm carbon fiber propeller included
Bore
0.654 in (16.6 mm)
Crankshaft Threads
Reverse
Crankshaft Type
Threaded
This product was added to our catalog on December 16, 2021
Big Bore Racing Carb from Zenoah (Walbro WT-1048), Designed for use with Zenoah watercooled (PUM) engines. Contains items shown in photo - Walbro WT-1048 carburetor (very similar to WT-257) but with 13.5mm venturi (The WT-257 has a 12.7mm venturi). Zenoah part # 580348901
Zenoah G300PUM 3.5+ HP Marine Engine
ENGINE SPECS:
Ignition: CDI-Type Magnetic
Displacement: 29.5cc (29mm stroke, 36mm bore)
Power: 3.7HP @13,000 RPM.
Torque: 1.23 ft-lbs (1.68 N-m) @10,000 RPM.
Timing: 30 degrees BTDC @ 8,000 RPM.
Compression Ratio: 8.9:1.
DIMENSIONS:
Length: 153mm
Width: 160mm
Height: 181mm
Weight: 3.5lbs (approx 1.6kg)
Starter: Easy Recoil Starter (eg195)
Available with no carburetor, or with your choice of WT-1048 or WT-257 carburetor.
Zenaoh Marine Engines are well known for both performance and reliability.
