French · 7 years on Samui
French motorcycle tour guide living on Koh Samui for 7 years. Marc leads group rides across southern Thailand and knows every road on the island.
Updated: May 2026
On the Nathon ring road straight last February at 95 km/h, the Z650RS's 649cc parallel twin was at approximately 5,800 rpm - operating in its smooth, torque-rich midrange. Peak power of 67 horsepower arrives at 8,000 rpm; at Samui's legal speeds, the Z650RS uses approximately 60 per cent of its available power. The result is a bike that feels completely unhurried at highway speeds - not constrained by the speed limit, but relaxed within it. For a rider who wants a bike that makes Samui's ring road feel effortless rather than committed, the Z650RS's displacement margin provides exactly that.
Above the Nathon junction last January on the Z650RS - the switchback section in third gear at 50 to 60 km/h - the 649cc twin's corner-exit torque was immediately evident. Compared to the CB300R and MT-03, the Z650RS pulls more confidently from lower rpm at corner exits, requiring fewer gear changes to maintain momentum through sequential switchback corners. The Showa SFF-BP inverted fork communicated the road surface precisely; the retro profile tyres provided consistent lateral grip on dry tarmac at the lean angles available on the switchback road.
At the Chaweng pedestrian crossing last November - wet painted tarmac, braking from 70 km/h - the Z650RS's dual 300mm front discs with ABS provided a progressive, controlled stop without wheel lock. The ABS intervened at the painted surface and released cleanly. From 95 km/h on dry tarmac at the Nathon junction last January, the Z650RS stopped within a distance that demonstrated the brake specification's capability without any drama. The Z650RS's braking system is a full modern specification that its retro styling does not advertise but the road riding confirms on every significant braking event.
Tracking fuel use on a mixed Samui day last March - ring road, mountain pass, north coast circuit, 68 kilometres total - the Z650RS used 2.6 litres of petrol. At current Samui petrol prices that day's fuel cost approximately 104 baht. The Z650RS returns approximately 26 kilometres per litre on mixed Samui riding - less economical than the CB300R's 30 km/h per litre, reflecting the 649cc displacement and the tendency to use the additional power on ring road and mountain sections. For a week-long rental covering 400 kilometres, fuel cost on the Z650RS is approximately 640 baht.
On a 70-kilometre ring road circuit last February - the Z650RS's longest single-day circuit I have ridden on Samui - I measured the accumulated engine vibration through the handlebars over the full circuit. The Z650RS's parallel twin at Samui road speeds produces less vibration than the CB300R's single but more than the CB500X's larger, smoother twin. After 70 kilometres the handlebar vibration was noticeable but not fatiguing. For circuits above 100 kilometres, the CB500X's smoother twin produces less accumulated fatigue. Within Samui's typical 50-to-80-kilometre day circuits, the Z650RS's vibration level is acceptable and not a limiting factor.
Seven years of riding the Kawasaki Z650RS on Koh Samui's ring road, mountain passes, and coastal roads has produced a consistent performance picture: a 649cc parallel twin with more power than Samui's roads require at legal speeds, braking capable of controlled emergency stops on wet tarmac, and suspension tuned for both retro aesthetics and performance riding. The Z650RS outperforms the CB300R and MT-03 on every measurable metric except the MT-03's corner engagement on tight switchbacks. For ring road touring at highway pace, it is the most capable naked bike in the Samui rental fleet.
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