
Engine:

The Ninja 400 features an all-new 399cc 4-Valve Parallel Twin Fuel Injected Engine which produces 49 HP @10,000 RPM and 38 Nm of torque @8000 RPM. With a compression ratio of 11.5:1, the bike can redline higher and also has a 200 km/h top speed. This engine too is in DOHC setup in which two cams control the Valve openings.
Chassis:

Ninja 400 uses the advance Trellis Frame whose worth has been proven by bikes ranging from KTM Duke 390 to Kawasaki H2. As a result, the weight of the bike with all the fluids is just 168 Kg, which is just 2 Kg more than the R3. The 41 mm Telescopic suspension up front is not as good as that of Yamaha’s but they do work quite well in almost all scenarios. Ninja 400 has petal Disc brakes which offer better heat dissipation and both of them are controlled by a Dual Channel ABS.
Dimensions:

The 2019 Ninja 400 is also quite accessible for riders of all sizes, with just a 5 mm taller seat than the R3. It also has a 14-litre fuel tank, which would give less mileage than the Yamaha R3 but is still good enough for a 300 km ride on a full tank. The Wheelbase of the bike is shorter at 1370 mm and so is it’s ground clearance at 140 mm.
The Shorter wheelbase on the Ninja 400 allows it to have a sharper rake at 24 degrees while the Yamaha R3’s longer wheelbase gives rise to a 25-degree caster angle.
Electrical:

Conclusion:
The updated Yamaha R3 looks sporty but doesn’t improve much in the name of performance. The overall dimensions of the bike are same, with changes in only the seating position and handlebar placement. The updates on this bike are mostly cosmetic besides the inclusion of Upside Down Forks and Dunlop Sportmax Tyres.
Ninja 400 on the other hand, clearly boasts a victory in outright performance thanks to an all-new 399cc engine and the Ultra Light Trellis Frame. The bike is Quicker, Lighter and Powerful in every way than the Yamaha R3. Although the folks at Yamaha had a clear shot this time with the R3 they chose not to take it.