I'm having issues mounting an engine on a mountain bike of mine. I just tried to mount the engine on a pannier rack behind the seat, above the back tire, had everything hooked up, and turned it on, and it worked for about a second. The torque bent the rack down, loosened the chain and the chain fell off. 
Anyways, here's what I have:
motor:
24 Volt 250 Watt Electric Bicycle Gear Motor
at Electric Scooter and Pocket Bike Motor - ElectricScooterParts.com
(the smallest bicycle motor with built in gear reduction)
and the bike is a 2005 hard tail Raleigh Mountain Bike (Mojave) seen below at
The Bike Stand Raleigh Hardtail
Note also that the motor is round. This makes it kind of tough to mount. I had a friend weld an L-shaped bracket that bolts to it so it could sit on the rack. (Pictures to come later.)
Any suggestions? I have the rear disk brake removed (with a bicycle sprocket hooked up instead). I have access to bicycle chain, #25 chain, and plenty of tools.

Anyways, here's what I have:
motor:
24 Volt 250 Watt Electric Bicycle Gear Motor
at Electric Scooter and Pocket Bike Motor - ElectricScooterParts.com
(the smallest bicycle motor with built in gear reduction)
and the bike is a 2005 hard tail Raleigh Mountain Bike (Mojave) seen below at
The Bike Stand Raleigh Hardtail
Note also that the motor is round. This makes it kind of tough to mount. I had a friend weld an L-shaped bracket that bolts to it so it could sit on the rack. (Pictures to come later.)
Any suggestions? I have the rear disk brake removed (with a bicycle sprocket hooked up instead). I have access to bicycle chain, #25 chain, and plenty of tools.