handlebar shakes

[denful]

is this expected because of heavy rear hub motor

 

[indianajo]

Doesn't happen on any of the bikes I keep. I had one or two where the handlebar would slip in the fork however much I tightened the top bolt, and I scrapped them.
Tap your spokes to see if any are loose. TIght ones go ping, loose ones go thud. You can use a crescent wrench to tighten them, I don't own a "spoke wrench". When the tire is off you can use a screwdriver on the end.
Axles can get loose, generally need a super thin 15 mm and or 17 mm wrench to tighten them. Inspect that no balls have dropped out if you find this. I made a super thin wrench by grinding a regular wrench thinner. Wear safety glasses using a grinder.

 

[erider_61]

Check to see if the front wheel is true. Lift the front wheel off the ground and give it a spin. It is not normal for the handlebars to shake. Rear hub motor is not causing this.

 

[6zfshdb]

I've never had handlebar shake occur on any of my rear hub ebikes. I do notice some slight vibration when riding on pavement with my knobby trail tires. This is normal though and can be minimized by lowering the tire pressure.

 

[AHicks]

is this expected because of heavy rear hub motor

No, not normal at all, in any conditions.

I'm thinking if this is a new bike, you may not have the tire installed properly. As above, hold the front up and give the front tire a spin. Any tire issue will be obvious.

Just occrured to me you may be talking about a "vibration" in the handlebars (higher frequency shaking). Depending on the tread pattern of the tires, that might be normal if you have a knobby tread pattern, especially when running on pavement.

 

[Off road all day]

All the weight on mine is at the rear, i have experienced front wheel "float" especially when i lean back, no steering! as far as wobble goes that sounds like the the the front end is not tightened down enough?
I have aggressive tires but no shake even at high speeds, i have noticed it while walking the bike and a leaning it around a turn. mine are hybrid, on/off road so A could be right about the tires.
I had a cut sidewall and put a small piece of old tube in to seal it, it was like driving with a concrete wheel, everything was out of wack!

 

[Jerry LM]

Something is amiss for sure, my step thru even at the occasional 28 mph does no shake at all. I would certainly find out before riding it though if something goes wrong that can cause loss of control it could be a disaster!