My '99 Busa with 130,569km (81,131 miles) has never broken down or even given any trouble at all since I got it 6 years ago at 75,000kms. . . . BUT, the usual suspects have been sorted BEFORE they failed or gave trouble.
It's called 'preventative maintenance', replaced original cams that had the hardening starting to wear away on the lobes and also the external fuel pump has been overhauled and maintained.
The compressions on all 4 cyls are at 210-220 psi and leakdown tests showed absolute minimum, barely noticeable, and that's on a motor that has never had the head off, valves never touched, just clearances maintained to spec.
Now, I wanna explain something about the psychology of customers and potential customers here.
There is a customer 'syndrome' that I have seen displayed by many customers at the workshops/dealerships that I have worked at over the last 35 years and it kind of goes along these lines, (they never actually say these words, but you can bet your last dollar they are thinking it ) . . .
"Right, now that I've paid your business to service my bike/car, you are now responsible for ANYTHING that goes wrong with my bike/car . . and I WILL hold you guys to account and you WILL fix it at NO COST to me."
They will argue the point ad nauseam until the workshop manager gives in and says "OK, ok ok . . . we will sort it but just shut ya whining up wouldya" . .
now this is not all customers by any means, but there seems to be a fair number that take this line. A lot of customers are good, fair people, but the bad apples have ruined it for them and they are also treated as a potential 'problem' customer.
So, in anticipation of this, and attempting to pre-empt this situation from eventually arising . . the workshop manager will try to address EVERY possible failure, past and present, that he sees on the vehicle when it presents for the first time at the workshop, for servicing or inspection.
I've never worked in a place where the mechanics are making up BS about the condition of a motor, or for that matter, any components of the vehicle presented, merely to get jobs in and make more money.
I will say I have seen mistakes made that have caused problems and damage to the vehicle, and the mechanic has made up a cover story to get his ass outta jail with the boss and the customer, but seldom thankfully. you see, the guy's (mechanic) reputation as a technician is on the line, and these sort of lies and cover ups tend to be exposed, one way or another eventually.
Funny old world we live in, but I know for sure that HONESTY is the best policy, full stop.