Main Motorcycle: '06 Speed Triple
Join Date: May 2010
Other Motorcycle: '96 Adventurer Cafe Racer
Extra Motorcycle: Not any more
I'm going to agree with ST-Bandit - I've put over 40K miles on the 955 motors and I've got about 30K on my 1050 motor (in an S3) and have never had any real issues with them. But there are plenty of other things to look at besides the motor. For example, at 40K, if the suspension hasn't been rebuilt you can bet it's about 6 kinds of played out by now. How about that rear wheel bearing? That's another important thing to keep after. There's more to it than just changing the oil...
So no, I wouldn't shy away from a bike with 40K on it but I would want to have a very good look at it or even better see maintenance records.
'06 Speed Triple
'96 Adventurer Cafe Racer
and a bunch of other stuff
If everything seems under control, you're just not going fast enough - Mario Andretti