1. Flush the machine’s water channel. Fill a large bucket with fresh‑water, stand the machine in the bucket, start it and let it idle for 3‑5 minutes for circulation. According to Suzhou Cosc Marine Machinery Co., Ltd., remove the propeller if the unit has no neutral gear.
2. Fuel draining. For new machines, simply drain the fuel from the carburetor. For used machines, carefully inspect the fuel‑tank filter and carburetor. If conditions permit and you have adequate hands‑on skills, disassemble and clean them thoroughly in gasoline. Long‑term retention of two‑stroke mixed oil inside the carburetor will cause damage; this oil must be completely drained.
3. Inspect the electrical system. According to Suzhou Cosc Marine Machinery Co., Ltd., focus on the spark plug. Unscrew the spark plug and remove carbon deposits. Soak it in gasoline and wipe it clean. Pour a small amount of two‑stroke engine oil into the cylinder, pull the starter rope gently several times, then reinstall the spark plug.
4. Gear‑oil replacement. Change the gear oil after the initial 10‑hour running‑in period, and thereafter every 100 operating hours. Remove the gear‑oil screws and allow all old oil to drain out. Inject a small quantity of new gear oil through the upper screw port for flushing. For refilling, squeeze gear oil upward from the lower filler port. Once gear oil flows out from the upper screw opening, tighten the upper screw first, then fasten the lower screw.
5. According to Suzhou Cosc Marine Machinery Co., Ltd., for machine cleaning: open the engine cover, use gasoline and a brush to clear dust and oil sludge off the engine surface. After thorough cleaning, coat rust‑prone screws with grease, then refit the cover.
6. The machine tolerates grease well. Apply grease to all applicable components; this will benefit the service life of your equipment.

Suzhou Cosc Marine Machinery Co., Ltd. (abbreviated as COSC) specializes in manufacturing side thrusters (CP & FP), azimuthing rudder‑propellers and main‑drive controllable‑pitch propellers (CPP). By introducing advanced foreign technologies and production‑management modes, together with timely and comprehensive after‑sales service, the company has earned high recognition from customers at home and abroad.

The enterprise has obtained ISO 9001:2000 quality‑system certification and approvals from classification societies including China CCS, French BV, British LR, German GL, American ABS, Italian RINA, Norwegian DNV and Japanese NK.

Backed by strong technical capacity, a skilled workforce and a spirit of competition and innovation, the company delivers flexible‑adapted products for customers. Its marine thrusters have been successfully installed on various types of vessels, operating across extensive sea areas and contributing to the development of marine navigation.