Yamaha V6 carbureted two-stroke 150 / 175 / 200 / 225 (64C) service guide

Quick answers

What two-stroke oil does a Yamaha V6 carbureted two-stroke 150 / 175 / 200 / 225 use?

2-stroke outboard motor oil, grade TC-W3. Oil injected models: engine oil tank 0.9 L (0.95 US qt, 0.79 Imp qt), sub-oil tank 10.5 L (11.1 US qt, 9.2 Imp qt).

What is the fuel to oil ratio for a Yamaha V6 carbureted two-stroke 150 / 175 / 200 / 225?

Oil injected models: fill the fuel tank with 50:1 fuel/oil mixture only for air bleeding the oil injection system and for the oil pump discharge test.

What gear oil does a Yamaha V6 carbureted two-stroke 150 / 175 / 200 / 225 use, and how much?

GEAR CASE LUBE (USA) or hypoid gear oil, SAE 90. Quantity: Regular rotation 980 cm³ (33.1 US oz, 34.5 Imp oz); counter rotation (L150, L200) 870 cm³ (29.4 US oz, 30.6 Imp oz); dual propeller D150H / D150TR 900 cm³ (30.4 US oz, 31.7 Imp oz). Fill through the drain hole until oil flows from the check hole with no bubbles.

What spark plug does a Yamaha V6 carbureted two-stroke 150 / 175 / 200 / 225 use?

USA models: 150TR and V150TR BR7HS-10 (NGK), qty 6. Worldwide models: 150FETO, L150FETO, 150GETO (S150TR, L150TR, P150TR) BR7HS-10; D150HETO, 175DETO, 175FETO, 200FETO, L200FETO, 200GETO, 225DET, 225DETO BR8HS-10; pre-mix 150AET, L150AET, 175AET, 200AET, L200AET BR8HS-10 (B8HS-10 for China). Gap: 0.9 to 1.0 mm (0.035 to 0.039 in).

How often should a Yamaha V6 carbureted two-stroke 150 / 175 / 200 / 225 be serviced?

The factory schedule lists: Initial 10 hours (Break-in); Initial 50 hours (3 months); Every 100 hours (6 months); Every 200 hours (1 year). In Hawaiʻi's salt water we do a full yearly service every 200 hours or 1 year, whichever comes first, and a new engine needs its first (break-in) service.

When should the water pump impeller be replaced on a Yamaha V6 carbureted two-stroke 150 / 175 / 200 / 225?

The factory schedule gives no replacement interval. In Hawaiʻi's warm salt water we replace it every 200 hours or 1 year, whichever comes first, because a worn impeller is the most common cause of overheating.

What is the idle speed of a Yamaha V6 carbureted two-stroke 150 / 175 / 200 / 225?

700 ± 25 r/min, all models. Trolling speed 575 ± 25 r/min (150TR, 150A, 150F, 150G, 175A, 175D, 200A, 200F, L200F); 570 ± 25 r/min (V150TR, 175FETO / P175TR); 600 ± 25 r/min (200GETO, 225DET, 225DETO).

What is the propeller nut torque on a Yamaha V6 carbureted two-stroke 150 / 175 / 200 / 225?

55 N·m (5.5 m·kg, 40 ft·lb). Dual propeller D150H / D150TR: rear propeller (M18) 55 N·m (5.5 m·kg, 40 ft·lb), forward propeller (M45) 65 N·m (6.5 m·kg, 47 ft·lb).

Maintenance specs

Engine oil	2-stroke outboard motor oil, grade TC-W3. Oil injected models: engine oil tank 0.9 L (0.95 US qt, 0.79 Imp qt), sub-oil tank 10.5 L (11.1 US qt, 9.2 Imp qt)
Fuel to oil ratio	Oil injected models: fill the fuel tank with 50:1 fuel/oil mixture only for air bleeding the oil injection system and for the oil pump discharge test.
Gear oil	GEAR CASE LUBE (USA) or hypoid gear oil, SAE 90
Gear oil quantity	Regular rotation 980 cm³ (33.1 US oz, 34.5 Imp oz); counter rotation (L150, L200) 870 cm³ (29.4 US oz, 30.6 Imp oz); dual propeller D150H / D150TR 900 cm³ (30.4 US oz, 31.7 Imp oz). Fill through the drain hole until oil flows from the check hole with no bubbles
Gear oil drain and check screws	Gear oil drain screw 7 N·m (0.7 m·kg, 5.1 ft·lb); gear oil level check screw 7 N·m (0.7 m·kg, 5.1 ft·lb). Install the check screw first, then quickly the drain screw
Lower unit holding pressure	USA models: 70 kPa (0.7 kg/cm², 10 psi). Worldwide models: 100 kPa (1.0 kg/cm², 14.2 psi). At the check hole with pressure tester YB-35956 / 90890-06762, must hold 10 seconds; do not over pressurize
Spark plug	USA models: 150TR and V150TR BR7HS-10 (NGK), qty 6. Worldwide models: 150FETO, L150FETO, 150GETO (S150TR, L150TR, P150TR) BR7HS-10; D150HETO, 175DETO, 175FETO, 200FETO, L200FETO, 200GETO, 225DET, 225DETO BR8HS-10; pre-mix 150AET, L150AET, 175AET, 200AET, L200AET BR8HS-10 (B8HS-10 for China)
Spark plug gap	0.9 to 1.0 mm (0.035 to 0.039 in)
Spark plug torque (M14)	25 N·m (2.5 m·kg, 18 ft·lb)
Idle speed	700 ± 25 r/min, all models. Trolling speed 575 ± 25 r/min (150TR, 150A, 150F, 150G, 175A, 175D, 200A, 200F, L200F); 570 ± 25 r/min (V150TR, 175FETO / P175TR); 600 ± 25 r/min (200GETO, 225DET, 225DETO)
Thermostat	Opens at 48 to 52 °C (118 to 126 °F); fully open at 60 °C (140 °F); valve open lower limit 3 mm (0.12 in)
Anodes	Inspect and replace as needed
Propeller nut (M18)	55 N·m (5.5 m·kg, 40 ft·lb). Dual propeller D150H / D150TR: rear propeller (M18) 55 N·m (5.5 m·kg, 40 ft·lb), forward propeller (M45) 65 N·m (6.5 m·kg, 47 ft·lb)
Power trim and tilt fluid	ATF Dexron II; reservoir cap 8 N·m (0.8 m·kg, 5.8 ft·lb). Tilt fully up before slowly removing the cap

Service schedule

The factory maintenance intervals, with what is replaced and what is checked at each. Rows marked Hawaiʻi are our shop's yearly service for salt water use.

1. Initial 10 hours (Break-in)

   Replace: gear case oil, gear case plug gaskets, propeller cotter pin

   Check: spark plugs, fuel filter

2. Initial 50 hours (3 months)

   Replace: gear case plug gaskets, propeller cotter pin

   Check: spark plugs, fuel filter, anodes

3. Every 100 hours (6 months)

   Replace: gear case oil, gear case plug gaskets, propeller cotter pin

   Check: spark plugs, fuel filter, anodes

4. Every 200 hours (1 year)

   Replace: gear case oil, gear case plug gaskets, propeller cotter pin, water pump impeller

   Check: spark plugs, fuel filter, anodes

We replace the water pump impeller at every service from 200 hours up, which can be sooner than the factory schedule, because of Hawaiʻi’s warm salt water.

Source: Yamaha 150C, V150C service manual. Specs can change by model year and serial number, so always confirm your exact model from the serial tag on the clamp bracket.