Yamaha F6 / F8 (2000, F6A / F6B / F8C) service guide
Oil, gear oil, spark plugs and the service schedule for the Yamaha F6 / F8 (2000, F6A / F6B / F8C) (6 to 8 hp, four-stroke), from the factory service manual, plus how we service it in Hawaiʻi.
Models covered: Four-stroke 2 cylinder SOHC, 197 cm³, one carburetor, CDI, tiller, manual start. F6AMH = F6MH, model code 68R, from S:000101 / L:300101; F8CMH = F8MH, model code 68T, from S:000101 / L:300101.
Quick answers
- How much oil does a Yamaha F6 / F8 take?
- 800 cm³ (27.0 US oz, 28.2 Imp oz).
- What engine oil does a Yamaha F6 / F8 use?
- 4-stroke engine oil, API SE, SF, SG or SH, SAE 10W-30 or 10W-40.
- What gear oil does a Yamaha F6 / F8 use, and how much?
- Hypoid gear oil, GL-4 (SAE #90). Quantity: 150 cm³ (5.07 US oz, 5.28 Imp oz).
- What spark plug does a Yamaha F6 / F8 use?
- BR6HS-10, qty 2. Gap: 0.9 to 1.0 mm (0.035 to 0.039 in).
- How often should a Yamaha F6 / F8 be serviced?
- The factory schedule lists: Initial 10 hours; 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 F6 / F8?
- 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 F6 / F8?
- 1,050 ± 50 r/min.
- What is the propeller nut torque on a Yamaha F6 / F8?
- STD 17 N·m (1.7 kgf·m, 12.5 ft·lb); DUAL 20 N·m (2.0 kgf·m, 14.7 ft·lb).
Maintenance specs
| Engine oil | 4-stroke engine oil, API SE, SF, SG or SH, SAE 10W-30 or 10W-40 |
|---|---|
| Engine oil quantity | 800 cm³ (27.0 US oz, 28.2 Imp oz) |
| Engine oil drain plug | 24 N·m (2.4 kgf·m, 17.8 ft·lb) |
| Gear oil | Hypoid gear oil, GL-4 (SAE #90) |
| Gear oil quantity | 150 cm³ (5.07 US oz, 5.28 Imp oz) |
| Gear oil drain and level check plugs | 7 N·m (0.7 kgf·m, 5.1 ft·lb) |
| Lower unit holding pressure | 100 kPa (1.0 kgf/cm², 14.2 psi) |
| Spark plug | BR6HS-10, qty 2 |
| Spark plug gap | 0.9 to 1.0 mm (0.035 to 0.039 in) |
| Spark plug torque | 25 N·m (2.5 kgf·m, 18.4 ft·lb) |
| Idle speed | 1,050 ± 50 r/min |
| Thermostat | Opens 58 to 62 °C (136.4 to 143.6 °F); fully open above 70 °C (158 °F); lift 3 mm (0.12 in) |
| Anode | Engine anode plug M16 18 N·m (1.8 kgf·m, 13.3 ft·lb); anode screw M5 2 N·m (0.2 kgf·m, 1.5 ft·lb) |
| Propeller nut | STD 17 N·m (1.7 kgf·m, 12.5 ft·lb); DUAL 20 N·m (2.0 kgf·m, 14.7 ft·lb) |
| Valve clearance | IN 0.15 to 0.20 mm (0.006 to 0.008 in); EX 0.20 to 0.25 mm (0.008 to 0.010 in); rocker arm locknut 8 N·m (0.8 kgf·m, 5.9 ft·lb) |
| Timing belt | Check for wear or damage, replace if needed; install with the part name facing up (no tension spec) |
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.
Initial 10 hours
Replace: engine oil, oil drain plug gasket, gear case oil, gear case plug gaskets
Check: spark plugs, fuel filter
Initial 50 hours (3 months)
Replace: gear case plug gaskets, propeller cotter pin
Check: spark plugs, fuel filter, anodes
Every 100 hours (6 months)
Replace: engine oil, oil drain plug gasket, gear case oil, gear case plug gaskets, propeller cotter pin
Check: spark plugs, fuel filter, anodes
Every 200 hours (1 year)
Replace: engine oil, oil drain plug gasket, gear case oil, gear case plug gaskets, propeller cotter pin, water pump impeller
Check: spark plugs, fuel filter, thermostat, 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 F6Z/F8Z service manual, LIT-18616-02-19; Yamaha F6AMH, F6BMH, F8CMH, F8CW / F6Y, F8Y worldwide 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.