Not in my book. If you need a tow truck to help you pick it up when you've laid it down, it's a two-wheel car, not a motorcycle. My personal limit is about 380 pounds.
After a spell as a development and test engineer at Norton, I don't have any patience with anything heavier than the Commando ( maybe 380 lb ready to roll). I once weighed the prototype while sitting on it and it was about 450#. At the time I was about 140 (don't I wish now!). I think the production version was a bit heavier. With a 750 engine at about 70 HP, that thing was quick enough for me!
I did about 20,000 miles of test riding on that bird in about 8 months, running 500 miles a day in 8 hours out on the road and a series of tests on a track at 100 mph for 10 hours a day.
Didn't pay worth a damn, but it was good fun. That's why I emigrated to work for Boeing, and I'm still in western Washington!
Frank Damp -Anacortes, WA,(DW- Eileen)
ex-pat Brits (1968) and now ex-RVers, as of 08 Dec 14.