Yamaha Finn 115 / Jupiter Z1 FI — OEM Fluid, Tire Pressure & Maintenance Specs
114cc Air-Cooled Horizontal Single SOHC 2-Valve FI (4-Speed Semi-Auto) · Source: Yamaha Finn 115 / Jupiter Z1 FI (2017–Present) Official Owner’s Manual Maintenance Specifications
According to the Yamaha Finn 115 / Jupiter Z1 FI (2017–Present) Official Owner’s Manual Maintenance Specifications, the 2017–Present Yamaha Finn 115 / Jupiter Z1 FI (chassis B6F/1DY) requires 0.8 L (0.85 US qt) of SAE 10W-40 (JASO MA2, API SG or higher) engine oil for a drain-only change and 0.85 L (0.90 US qt) with filter service (1S7-E3440-00 / HF141). Standard solo cold tire pressure is 200 kPa / 2.00 bar / 29 PSI front (70/90-17M/C 38P) and 225 kPa / 2.25 bar / 33 PSI rear (80/90-17M/C 50P), paired with 1× NGK CR6HSA spark plug(s) and a YTZ5S battery.
Drain only: 0.8 L (0.85 US qt)
R 225 kPa (2.25 bar)
Est. Range: ~248 km (154 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Wet Centrifugal Semi-Auto Clutch NEVER use JASO MB |
|---|---|
| Recommended Viscosity & Grade | SAE 10W-40 · JASO MA2 · API SG or higher |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 0.8 L (0.85 US qt) • With filter/strainer: 0.85 L (0.90 US qt) • Complete dry overhaul: 1 L (1.06 US qt) |
| OEM Oil Filter Code & Type | 1S7-E3440-00 / HF141 |
| Correct Oil Level Check Method | Hold upright on level ground; rest dipstick UNTHREADED on filler neck (do NOT screw in) |
| Oil Drain Bolt Torque | 20 N·m (14.8 lb-ft / 2.04 kgf·m) — Use fresh crush washer |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 70/90-17M/C 38P · Rear: 80/90-17M/C 50P (Tube-Type Spoke Rim) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 200 kPa / 2.00 bar / 29 PSI Rear: 225 kPa / 2.25 bar / 33 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 200 kPa / 2.00 bar / 29 PSI Rear: 250 kPa / 2.50 bar / 36 PSI |
| OEM Spark Plug & Quantity | NGK CR6HSA × 1 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YTZ5S (12V 3.5Ah MF AGM) |
| Final Drive Maintenance | 428 Drive Chain — Maintain 20–30 mm slack and lubricate regularly |
| Brake Fluid & Coolant | DOT 4 · Air-Cooled Horizontal Single Engine (No liquid coolant) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 114 cc · 9.6 hp @ 7,750 rpm · 9.9 N·m (7.3 lb-ft) @ 6,500 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 775 mm (30.5 in) · 100 kg (220 lbs) |
| Fuel Tank & Est. Real-World Range | 4 L (1.1 US gal) · ~62 km/L → ~248 km (154 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 3,000 km / 6,000 km • Air Filter / Spark Plug: 12,000 km / 9,000 km • Valve Clearance Check: 12,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Serving as Yamaha’s high-economy ASEAN 17-inch commuter underbone alongside the sportier Jupiter Z1, the Finn 115 pairs a forged piston with a replaceable paper oil filter.
Oil & Clutch Mechanical Engineering Note
Equipped with replaceable right-case paper filter HF141 and a wet centrifugal semi-auto clutch, refill 0.85 L w/ filter of SAE 10W-40 JASO MA/MA2 oil.