The GSX-R750L was possibly the best of the oil-cooled models. Big changes included inverted forks and, importantly, a return to the long-stroke motor (the short-stroke wasn't so good in race-trim but was OK for the road). Other modifications included a 4-1 exhaust, steering damper, 38 mm carbs (up 2 mm on the standard K yet 2 mm smaller than the RK), smaller valves, new conrods, lighter pistons, large capacity oil pump, larger curved oil cooler and the rear rim became the 'standard' 17" x 5.5" item. Power was up to 115 hp at 11,000 rpm while weight was down to 193 kg.
Drawing on the invaluable experiences gained racing, the 1990 model received many of the features of the race version GSX-R750R at an affordable price.
The same long-stroke engine (70 x 48.7mm) of the 'Double R' became standard, with new pistons to match the new combustion chamber design in the cylinder head and strengthened connecting rods. New 38mm Slingshot carburetor, Curved-core Radial Flow oil cooler and stainless steel 4-into-2-into-1 exhaust per set were adopted. Both 41mm inverted tube front fork and remote reservoir rear shock became fully adjustable. Rear wheel rim was widened and equipped with Michelin radial tyres
Every detail of the chassis and engine of the GSX-R down to the single bolt was reevaluated for the new 1988 model. The fairing was redesigned for 5.7% less frontal projection and 11% lower drag. The wheelbase at 1400mm made the GSX-R the most compact bike in the class. The lightweight aluminium alloy frame incorporated 45mm box tube main section and the cast swig arm pivot resulted in 60% more ridity. Front fork stanchion tubes were increased to 43mm diameter with variable damper adjuster type inner rods. The back end featured full floating suspension with new linkage and needle bearing for smoothness. Opposed 4 piston brake calipers, new weight-saving hollow-typecast wheels, and wide Michelin radial tyres became new standard equipment. The distinctive air-cooled with SACS engine received larger diameter oil hose and less restrictive joints for 20% increase in the coolant flow and the large 15 row cooler improved the cooling efficiency by 48%. The red zone started at 13,000 rpm.
Engine bore and stroke changed from the previous 70 x 48.7mm to shorter stroke 73 x 44.7mm to reduce reciprocating motion mechanical loss. The new Slingshot carburetors were equipped with lightweight throttle valves for increased throttle responsiveness. Another important addition was the incorporation of SACI (Suzuki Condensed Air Intake) system bringing fresh air from ducts on the front of the fairing to the carburetor intake for maximizing cylinder charging efficiency.
All Suzuki Motorcycles Ever Built
88 en 89 zelfde blok,behalve de rr: