Which one........

[JohnnyBoxer]

is truly unstoppable and will be still running in 20 years time

 

[Dennis the Menace]

is truly unstoppable and will be still running in 20 years time

All of them

 

[JohnnyBoxer]

Even the one on the far left Dennis

 

[Dennis the Menace]

Even the one on the far left Dennis

F650 Funduro made in1993 best selling BMW, engine is Rotax still lots F650 about
F800 engine is Rotax so should last 20 years (don't know about the BMW bits though)
No doubt when your mate bothers to get out of bed he will have something to say