The 2002 Yamaha XJR1300 weighs 6kg (13lb) less than the current model and, thanks to larger carbs and a new exhaust system, torque is up from 73.8ftlb to 79ftlb.
The reduction to 224kg (493lb) is aided by a lighter swingarm and hollow three-spoke rear wheel.
That cut in unsprung weight should bring an improvement in handling, too.
Yamaha UK’s Dan Harris says the new model will replace both the current XJR1300 and the higher spec SP version.
Yamaha reckons the engine is also quieter, thanks to new camshafts, and cleaner, thanks to a new system that introduces fresh air into the exhaust ports.
The suspension has also been upgraded. The front forks are lighter, the rear Ohlins shocks have been fitted with larger, softer bump-stop rubbers, and the settings have been tweaked front and rear.
Yamaha claims braking has been improved by the new two-piston brake calipers and sintered pads, which also save weight.
In addition, higher overall gearing " improves mid-range driveability " , says Harris.
The bike is slimmer in the middle, thanks to a reshaped tank which still retains the 21-litre capacity of this year’s model, a narrower seat and new side panels. The new seat has brought the pillion down almost level with the rider.
Other mods include corrosion-resistant engine side covers, new hazard warning lights and new front brake and clutch levers, with five adjustment settings compared to the current model’s four.
There are three new colour schemes – black; purple and blue; or blue and silver with a black engine.
The bike, due to make its debut at the Milan Show next week, will be available from Spring at between the current XJR1300’s £6199 and the SP version’s £6599.