The Ninja 250 motor puts out about 35hp.... much more than 14!
I'm not so sure how a 10hp diesel motor will do in a enduro/motocross style frame. Since you are siting upright, the frontal area will be very high.
If i were doing this, i would look for a bike that will give the lowest possible frontal area.... perhaps a Honda Rebel 250 frame or something similar.
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