Yamaha RD 350F (1985) vs Yamaha XSR 155 (2019) vs Yamaha RD 350RR (1985) vs Yamaha YZF 600R Thundercat (1996) vs Yamaha XT 225 Serow (1985-86)
Comparison technical specifications
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| Make: | Yamaha | Yamaha | Yamaha | Yamaha | Yamaha |
| Model: | RD 350F | XSR 155 | RD 350RR | YZF 600R Thundercat | XT 225 Serow |
| Years: | 1985 | 2019 | 1985 | 1996 | 1985-86 |
| Engine: | Two stroke, parallel twin cylinder, YPVS | Four stroke, single cylinder, SOHC, 4 valve with variable valve actuation | Two stroke, parallel twin cylinder, YPVS | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder | Four stroke, single cylinder, SOHC, 2 valve |
| Capacity: | 347 cc / 21.1 cu-in | 155.1 cc / 9.14 cu-in | 347 cc / 21.1 cu-in | 599 cc / 36.5 cu-in | 223 cc / 13.6 cu-in |
| Bore x Stroke: | 64 х 54 mm | 58.0 × 58.7 mm | 64 х 54 mm | 62 x 49.6 mm | 70 X 58mm |
| Cooling System: | Liquid cooled | Liquid cooled | Liquid cooled | Liquid cooled | Air cooled |
| Compression Ratio: | 6.2 :1 | 11.6:1 | 6.2 :1 | 12.0:1 | 9.5:1 |
| Induction: | 2x 26mm Mikuni slide-needle carburetor | Fuel Injection | 2x 26mm Mikuni slide-needle carburetor | 4 x 36 mm Keihin CV downdraft carburetors | 34mm Mikuni carburetor |
| Ignition: | Flywheel magneto CDI | TCI | Flywheel magneto CDI | Digital TCI | CDI |
| Starting: | Kick | Electric | Kick | Electric | Kick |
| Max Power: | 59 hp / 43.9 kW @ 9000 rpm | 14.1 kW / 19 hp @ 10000 rpm | 59 hp / 43.9 kW @ 9000 rpm | 72.9 kW / 100 hp @ 11500 rpm | 20 hp / 15 kW @ 8000 rpm |
| Max Torque: | 40.2 Nm / 4.1 kgf-m / @ 8000 rpm | 14.7 Nm / 40.8 lb-ft @ 8500 rpm | 40.2 Nm / 4.1 kgf-m / @ 8000 rpm | 65.7 Nm / 6.7 kgf-m / 48.7 lb-ft @ 9500 rpm | 19 Nm / 14 lb-ft @ 7000 rpm |
| Transmission: | 6 Speed | 6 Speed slip-and-assist clutch | 6 Speed | 6 Speed | 6 Speed |
| Final Drive: | Chain | Chain | Chain | 530 O-ring chain OEM sprocket sizes per tooth Front= 15 Back= 47 | Chain |
| Front Suspension: | 35mm Telescopic forks air assistance and variable damping | Upside-down Telescopic fork | 35mm Telescopic forks air assistance and variable damping | 41 mm telescopic fork adjustable preload, compression and rebound damping | Telescopic fork |
| Rear Suspension: | Rising rate Monocross 5-way preload | Monoshock operating on a die-cast aluminium swingarm | Rising rate Monocross 5-way preload | Monoshock adjustable preload, bump and rebound | Swingarm rebound adjustable. single shock |
| Front Brakes: | 2x 260mm disc 2 piston calipers | Single 282mm disc 2 piston caliper, ABS | 2x 260mm disc 2 piston calipers | 2x 300 mm Discs, 4 piston calipers | Single 220mm disc |
| Rear Brakes: | Single 260mm disc 1 piston caliper | Single 240mm disc 1 piston caliper, ABS | Single 260mm disc 1 piston caliper | Single 245mm disc, 2 piston caliper | Single 110mm drum |
| Front Tyre: | 90/90-18 51H | 110/70 -17 | 90/90-18 51H | 120/60-17 | 2.75-21 |
| Rear Tyre: | 110/80-18 58H | 140/70 -17 | 110/80-18 58H | 160/60-17 | 120/80-18 |
| Wheelbase: | 1385 mm / 54.5 in | 1330 mm / 52.3 in | 1385 mm / 54.5 in | 1415 mm / 55.7 in | 1349 mm / 53.1 in |
| Seat Height: | 790 mm / 31.1 in | 810 mm / 31.8 in | 790 mm / 31.1 in | 810 mm / 31.7 in | 810 mm / 31.9 in |
| Ground Clearance: | 165 mm / 6.4 in | 170 mm / 6.6 in | 165 mm / 6.4 in | 135 mm / 5.3 in | 285 mm / 11.2 in |
| Fuel Capacity: | 17 Litres / 4.5 US gal | 10 Litres / 2.6 US gal | 17 Litres / 4.5 US gal | 19 Litres / 5.0 US gal / 4.2 Imp gal | 8.7 Liters / 2.3 US gal |