| MODEL | SUZUKI GT 550J 1972 |
| Year | 1972 |
| Engine Type | Two-stroke, transverse three-cylinder |
| Displacement / Capacity | 543 cc / 33.1 cu in |
| Bore X Stroke | 61 x 62 mm |
| Compression Ratio | 6.8:1 |
| Cooling System | Air-cooled (Ram Air shroud) |
| Max Power | 37 kW / 50 hp @ 6500 rpm |
| Max Torque | 53 Nm / 39.7 lb-ft @ 6000 rpm |
| Ignition | Battery/coil with contact breakers |
| Induction | 3 x 28 mm Mikuni carburettors |
| Start System | Electric and kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5-speed, constant mesh |
| Clutch | Multi-disc, wet |
| Final Drive | Chain, endless 530 |
| CHASSIS SPECS | |
| Frame | Welded mild steel tubing |
| Front Suspension | Telehydraulic fork |
| Rear Suspension | Dual shocks, swinging fork, preload adjustable |
| Front Brakes | Drum with four leading shoes |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | 2195 mm / 86.4 in |
| Overall Width | 815 mm / 32.1 in |
| Overall Height | 1160 mm / 45.7 in |
| Seat Height | — |
| Wheelbase | 1465 mm / 57.7 in |
| Ground Clearance | 145 mm / 5.7 in |
| Dry Weight | 186.8 kg / 412 lb |
| Wet Weight | 211 kg / 465 lb |
| WHEEL SPECS | |
| Front Tyre | 3.25-19 |
| Rear Tyre | 4.00-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 12.5 Litres / 3.3 US gal / 2.7 Imp gal |
| Fuel Consumption | About 30-35 mpg (road test) |
| Top Speed | About 95 mph indicated (road test) |
The GT550J was the first model of Suzuki's mid-size air-cooled three-cylinder two-stroke, known as the Indy in America. It used a Ram Air shroud over the cylinder head and a drum front brake with four leading shoes. The engine was smooth with strong midrange, though the chassis and brakes were considered its weak points.
