I did the same thing. So far I have broken 3 frames just from riding fast. 2 heavy beach cruisers and one full suspension mountain bike. I'll probably get something like this next.
US $455.67 17%OFF | US free shipping Enduro Ebike Frame, Black Electric Frame for 3000W/5000W/8000W Motor Electric Bicycle Waterproof Inside Battery https://a.aliexpress.com/_mqSgpu4
I got a conversion kit from Luna cycle. So far my frame has held up. I'm so scared of the bike I only use the motor to go up hill now. My cousin told me I can install a pedal assist sensor and brake cut off switches to make it safer and the battery last over 100 miles
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