hi,
i have started a trip with my motorbike, bmw r80, in september last year.
it's a simple enginge, which most mechanics could fix. in some countries (don't ask me which...) the police drive bmw's their workshops could help.
check my website for recommended motorbike mechanics in dakkar, cote d'ivoire and burkina faso:
www.contrast.cx/diary
=> travel info
i think it doesn't matter wheter you'd take a honda or a yamaha. but you'll have a hard time to find spares for KTM.
cheers,
steven