Arguably the best of the oil-cooled models is distinguished by the first use of inverted forks (41mm, fully adjustable items) on a large capacity Japanese machine. It also saw a return to the long-stroke motor along with a new 4:1 exhaust, steering damper, 38mm carbs (up 2mm on the previous 'K' although 2 mm smaller than the R), smaller valves, new conrods, lighter pistons, a large capacity oil pump, a larger, curved oil cooler and a wider rear rim.  Tyres were now Michelin radials as standard while power was up to 115bhp at 11,000rpm with weight was back down to 193kg.