Long gone are the days when "custom motorcycle", a term generally associated with HD and similar styles, would imply "I can repair this by myself, heck, even modify it with spare parts taken from a demolished truck".
Repairing modern motorcycles isn't difficult. Even working on state of the art throttle-by-wire engines isn't difficult, other than it taking a bit more time to get all the fairings off. This is about what effect repairs will have on the warranty - and if you're building a custom, you're usually going to start with a bike that's out of warranty anyway.
The only overlap is getting hold of the manuals. Bike manufacturers have started to put them online only, like car manufacturers, and charge for access. That's a pain in the neck.
The only overlap is getting hold of the manuals. Bike manufacturers have started to put them online only, like car manufacturers, and charge for access. That's a pain in the neck.