True story...
A few years back I purchased a used Honda VFR800.
Rode it for a few weeks no problem.
Then one day it just shut down ( middle of freaking nowhere of course). In the dark, no tools.....
Called AAA, had it taken to the Honda dealer.
They found that the main fuse had been replaced with a solid piece of copper and now part of the wiring loom had fused together and shorted out, hence the shutdown.
$800 later for a fuse.........