apart from bascis like regular oil changesand bigger engines being more capable generally speaking - what do you think is a reasonable expectation for a 1000cc bike please?

1000cc bikes should do 50K without anything serious if they have been serviced imo, possibly up to 75K but what do you reckon? Of course, there's other related items, bearings for both steering and axils, clutches and final drive transmission but I'm on about the engine, carbs and gearbox.