The power/weight ratio was a bit better in 1986 0,39 hp/kg (0,18 hp/lbs). The upgraded Suzuki GSX-R400 new chassis, shorter wheelbase and was totally redesigned.
I fact, you could say it was a totally new bike. It even got a new internal model code: GK71F (presented in March 1986).
The 1986 and 1987 year’s engines differ from the other models, they do not have the normal type of liquid-cooled engines. Instead they the use the SATCS (Suzuki Advanced Three-way Cooling System) that used water, oil and air to keep the engine from overheating.
The 1986 year’s GSX-R400 (Type 3) had a single square headlight instead of two round headlights. The new front design didn’t gain popularity and the twin headlight were reintroduced the following year.
Suzuki GSX-R400 1986 Specifications
Colors White / Blue White / Red
Dimensions and dry mass Type (frame code): GK71B Overall length: 2,055 mm (80.9 in.) Overall width: 680 mm (26.8 in.) Overall height: 1,155 mm (45.5 in.) Wheelbase: 1,400 mm (55.1 in.) Ground Clearance: 135mm (5.3 in.) Dry mass (weight): 153 kg (337 lbs)
Engine Engine type: Water/air/oil-cooled DOHC inline-4, 16 valves, TSCC Bore x stroke: 53,0 mm x 45,2 mm (2.087 x 1.780 in.) Piston displacement: 398 cc Compression ratio: 11,3 :1 Maximum power: 59 hp/ 12,000 rpm Maximum torque: 3,8 kg-m/ 10,500 rpm Maximum speed: 175 kph Starting system: Electric starter Lubrication system: Wet sump Carburetor: AISAN AS27VW x 2