Join Date: Dec 2005
Location: Montreal, Québec, Canada
The problem is more the age of the bike than it's engine mileage.
These engines can run forever. You might just notice a SLIGHT decrease in performance but that's it.
As for the rest of the bike (other components) ... that's where the troubles begin.
On an older bike,
- Everything that's rubber will start to crack from sun/cold/heat/etc. So you end up with
- Leaky radiator pipes,
- Leaky fuel conducts.
- Shorts in the electrical,
- Wirecables (clutch, gaz, choke) that have not been lubed and are sticking,
- Loose head bearing,
- The regulator will sometime burn,
- Fork seals will give,
- Seat leather/vinyl will crack, ...
- Battery will die
But all that is replaceable/repairable.... As for the engine (which is all metal)... I really don't know how long it can run...
My GUESS is that a motorcycle engine+frame can run decently for SEVERAL 100,000 miles...if you maintain/replace the rest of the bike's components.
The call to "kill" a bike comes when the cost to maintain it is too much vs it's market value (obviously, does not happen to vintage bikes which did not get trashed and are now worth $$$ and climbing as they get older).
I just disassembled my VFR750 1990 (60,000) cause it had a leaky valve...
Replaced the valve guide and had the valve seats machined... The bike runs like new... and all the other internal engine parts looked very good (connecting rod, piston crown, even the rings).
GSX-R1000 K5 (So fast)
VFR750 1990 (So smooth)
TwinStar 185 1978 (So old... It's my 1st bike!)