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Welcome to the forum from Dallas. I've been to HK once a few years ago.

It looks like it probably would fit. Measure the seat post tube from the BB to under the top tube. If it's more than 11 1/2" it would probably fit.

I got a motor in this frame with a lot of trouble, and yours looks easier.

I don't know what engine you are going to use but if the opening in the bike frame is larger than the motor it will fit. You may have to do some fabricating to fit it up.