My GPX600R

This was my introduction to motorcycling. It was a great bike, fun, quick, light, reasonably comfortable and quite practical. Mine was a US import. I wish I still had it for commuting on, but it had to go when I bought my ZX7R.

Modifications Made:
Aftermarket bodywork (Fitted by the previous owner)
Aftermarket Rear Shock (longer than stock and with much better damping)
Michelin Macadam 90 (Non standard sizes - 120/80 Front - 150/80 Rear)
Goodridge steel braided brake hoses
Stripped calipers, new seals
EBC HH brake pads
Fresh fork oil

Look out for:
Problems with the AntiDive: This is electrically operated from your brake light switch so check that the switch and contacts are working fine. On my GPX the contacts were misbehaving, but they are very easily sorted.
Inaccurate steering: Tired suspension and worn tyres have a very big effect on the GPX's handling. Oversize Radial tyres (120/80 - 150/80) calm the steering making it more predictable whilst a longer aftermarket shock will keep the steering sharp.
Carb Icing: Not a big problem really. In two and a half years of riding in all weather through rain, sleet, freezing fog, etc. it only happened to me once. Depending on weather conditions it can take up to 45 minutes of sitting at the roadside before it clears up

That's me on my GPX 8 months after purchase

And this is a standard GPX600R


Specification:

Engine	4-stroke, DOHC in-line four, 16-valves, 592 CC
Fuelling	4 x Keihin 36mm CVKD (Constant Velocity) carburettors
Claimed Power (Crank)	84bhp
Gearbox	6 speed
Frame	Dual Loop - Steel - alluminium
Rake/Trail	27 degrees/91mm
Wheelbase	1425mm
Dry Weight	180kg
Front Suspension	38mm RWU Forks - unadjustable
Rear Suspension	Uni Track monoshock. Air adjustable Preload, Rebound (4 way)
Tyres	Front: 110/90V16, Rear: 130/90V16
Brakes	Front: Dual 260mm disks with 2 piston slider calipers (Tokiko). Rear: Single 240mm disk with 2 piston slider caliper

Data from Performance Bike Magazine (November '93)

Top Speed	SS 1/4 & speed	Bhp @ rpm	Mpg avg
123.4	12.30@109.7	69.0@10,000	51.9