Why not just rebuild the crank? I think that you can get a CR250 rod kit, and have the crank rebuilt for $35 by RB Design. If you add in gaskets (and why not do main bearings and seals while you're there), you can do the whole job for $300. Then, you have a known good entity that the boy can ride for the next 4-5 years.
Actually, you two could do the job together, and he can learn all about engines and that kind of stuff. Good skills to have. The best way to learn is to do it yourself.
blitz.
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