I see. So you don't know much about modern bikes then? No worries, I don't know much about boats or buses.
Modern Triumphs are grossly over-engineered, and are at least as reliable and well made as anything from Japan, and there is no reason a modern Bonnie can't do over 100,000 kms with no major work done on it - the local Triumph dealer have yet to open a modern Bonnie engine. And they don't leak oil either.
As for parts availability, the modern Bonnie range have been one of Triumph's biggest sellers whereas the W650 is a bit of a dead end, and there aren't a lot around. That means Triumph parts are readily available, and the longest you should wait for damn near anything is 3 weeks, although a lot comes down to the parts guy you deal with. Triumph parts are bloody expensive, but the huge number of Bonnies sold over the last 10 years mean that second hand parts are reasonably easy to get, and www.vgcspares.co.nz stock pretty much everything you need at good prices.
I rode both bikes back to back a couple of years ago, and the Bonnie with 200cc bigger engine means less work for your left foot and is a bit gruntier (not a whole heap though). The Bonnie also feels bigger and more planted, but the Kwakka has a kickstarter and actually looks more like an old Brit bike. Both handle and brake well for retro bikes and while I only rode the Kwakka for 30 or 40 kms, I can imagine it would be easy to ride for extended periods. I have ridden Bonnies quite a lot, and they are very capable tourers as long as you remember that they're not quick and have a range of around 220kms before reserve.
Personally I think the Bonnie is a better bike in every way (apart from a few styling things and that kickstarter), but they're more expensive.
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