Aprilia RS660
100 hp, 660 cc, 403 lbs2020 - 2021
Kawasaki Z900
125 hp, 948 cc, 463 lbs2017 - 2019
EngineAprilia RS660Kawasaki Z900
Displacement660 cc948 cc
Max power100 hp (@10 500 RPM)125 hp (@9 500 RPM)
Max torque49 lb ft (@8 500 RPM)72 lb ft (@7 700 RPM)
Redline12 000 RPM10 500 RPM
Idling speed1 200 RPM1 100 RPM
ManagementFuel InjectionFuel Injection
LayoutDOHC Inline-2DOHC Inline-4
Compression13.50:111.80:1
Oil capacity3.79 quart
Spark plug typeNGK CR9EIA-9
CoolingLiquidLiquid
Valves816
Bore81.0 mm73.4 mm
Stroke63.0 mm56.0 mm
Throttle bore48.0 mm
Weight to power4.03 lbs/hp3.70 lbs/hp
Power to weight619 hp/2500lbs674 hp/2500lbs
Battery type12 V 8 Ah, YTX9-BS
GearboxAprilia RS660Kawasaki Z900
TypeSequentialSequential
ClutchWetWet
DriveChainChain
Chain type
Gears count06
Primary ratio1.627
Final drive2.522.933
1. gear2.692 (60 mph)
2. gear2.059 (79 mph)
3. gear1.65 (98 mph)
4. gear1.409 (115 mph)
5. gear1.222 (133 mph)
6. gear1.034 (157 mph)
ChasisAprilia RS660Kawasaki Z900
Frame typeDouble beam aluminumTubular backbone (with engine subframe), high tensile steel
Front susp.41mm KYB USD, 4.72 in travel41 mm inverted fork (120 mm travel)
Rear susp.Monoshock, 5.12 in travelBottom-Link Uni-Trak (137 mm travel)
Dyno chart of 2017 Kawasaki Z900