I probably shouldn't be saying this here, but I absolutely love old Kawasaki air cooled fours. Totally bulletproof, plenty of low down power (which you don't get with modern revvy fours), nice and simple to work on... And they have slide carbs!! I like slide carbs!!
Hmmm, must get my old Zed back on the road!
This being a Triumph forum (

), let me just say that I am totally enjoying the Bonnie too! I just haven't had to delve into its inner workings yet, so can't pass judgement on what it's like to work on...