KAWASAKI · Lightweight Sport
Ninja 400 Spec Sheet
Lightweight 399cc twin on a steel trellis frame. Final US year 2023.
2023 · 399cc parallel-twin · 6-Speed
Power
44.8hp
Torque
28lb-ft
Curb weight
362lb
0–60 mph
4.1s
Seat height
30.9in
MSRP
$5,299
ClassLightweight Sport
Model year2023
Stock colorMetallic Carbon Gray
Road legalYes
Parts in MotoModder74
FuelRegular (87+ octane)
Oil changeevery 4,000 mi
Valve checkevery 16,000 mi
Rear tire150/60-17
Chain520
Performance & engine
Claimed figures for the US model, plus magazine-tested acceleration.
Engine399cc parallel-twin
LayoutParallel twin
Displacement399 cc
Horsepower44.8 hp (claimed, US)
Torque28 lb-ft
Gearbox6-Speed
Clutchless shiftingNone
0–60 mph4.1 s
¼ mile13.0 s
Power-to-weight8.07 lb per hp
Curb weight362 lb
FuelRegular (87+ octane)
MSRP$5,299
Garage reference card
The numbers you look up mid-wrench. 15 of 15 published values are filled in; torque specs, plug gap, coolant and idle come from your owner's manual. Tap any value to edit it; your changes save on this device.
Tires & Chain
Fluids & Capacities
Engine & Electrical
mm
rpm
Chassis
Your edits save automatically. Reset restores the published values.
Service schedule
The intervals MotoMaintain uses for the Ninja 400, whichever comes first. Track them in MotoMaintain →
Engine Oil & FilterFresh oil and a new filter. The single most important service for engine life.
Every 4,000 mi or 12 mo Chain Clean & LubeClean and re-lube the chain. Do it more often in wet or dusty riding.
Every 500 mi Chain Tension & InspectionCheck chain slack, adjust if needed, inspect sprockets for wear.
Every 4,000 mi Air FilterInspect and replace the air filter. More often if you run a high-flow filter.
Every 12,000 mi Spark PlugsReplace spark plugs. Iridium plugs typically last the full interval.
Every 16,000 mi Brake FluidFlush and replace brake fluid. It absorbs moisture over time regardless of miles.
Every 24 mo CoolantDrain and replace engine coolant.
Every 24,000 mi or 36 mo Valve Clearance CheckMeasure valve clearances and shim as needed. A big, interval-based service — intervals vary a lot by engine.
Every 16,000 mi Brake PadsInspect pad thickness. Replacement is wear-based — track and aggressive riding wears them faster.
Check every 4,000 mi TiresInspect tread depth, pressure, and condition. Replacement is wear-based.
Check every 3,000 mi Full Service / InspectionComprehensive dealer-style inspection: fasteners, bearings, suspension, electrical, fluids.
Every 8,000 mi or 12 mo