Hi, anybody know what diameter 3he pistons are???

Engine Type: 599 cc, 4 Stroke - Liquid Cooled - Inline-4
Engine Bore and Stroke: 59 mm x 54.8 mm
Compression Ratio: 12:1
Valves DOHC, 4 valves/cylinder
Carburetion: Mikuni BDST32 x4
Ignition System: Transistor controlled (digital)
Claimed Horsepower: 91 hp (67.9 kW) @ 10500 rpm
Maximum Torque: 65.7 Nm (48.5 ft. lbs) @ 8500 rpm

Transmission type: 6 speed

shame no one could give a more detailed answer!

Yes - it was the first thing I found on google

I have a manual or two somewhere if you get stuck on anything else