I don't have a motor-bike just a Q.

[maddyfish]

It came up in another thread, do you ride your motor-bike in bike lanes?

If you do, is there a power level where you no longer would?

Full diclosure: I do not ride a motor-bike, I don't think I've even ever seen one, and I do not ride in, or care for bike lanes.

[Abneycat]

That depends on the capabilities of the bike so far as maneuvering and stopping is concerned as well, I suppose. Also would depend on whether we're talking about a road style bike path or a seperated MUP.
On an MUP, I wouldn't advocate riding any faster than what would be safe to mesh with the other traffic, which could include kids, pedestrians, and clueless joggers looking at the trees with their iPods turned up. On a dedicated, travel oriented bike lane?

Personally, 40kph. Some riders could handle going faster i'm sure, but passing other bikes at high speeds would be potentially dangerous. Thats the fastest speed you'll typically see around here, and thats for fitter riders on faster bikes - a lot of people don't hit over 25. At 40kph, an experienced rider can still stop and respond to potential dangers in decent time at that speed.

Currently, the speed limit is 35kph for an e-bike in Alberta, and I personally find that very acceptable - while a seasoned rider could handle more, not everyone is a really great rider - this limit serves the general public pretty well.

P.S. I don't care for bike lanes in places they don't need to be either :)
I do however like MUPs, and seperated paths along notably dangerous roads. Those are nice to have.

[maddyfish]

If I understand what a MUP is, my kids and I ride on one that loops around a park near our house. Lots of kids, dogs, strollers, and old people. I would think 10-12 mph (15-20 kph) would be a max for it.

[Digikid]

They are called Ebikes....not motor bikes. Motorbikes you need a licence and insurance for.