Where can I buy affordable cr125 engine?

I'm about to build a go kart but I really emphasize on the engine I'm about to pick. Reason being, it's the heart and soul of a go kart and the Honda CR125 engine can basically go on every surface (rock, dirt, mud and even race tracks). Nevertheless, I found some results but then engine only has the bottom end, or is still attached to the bike (which makes it really expensive!) and it's hard for me to find results since I live in Canada, Quebec. Where can I find affordable cr125 engine (or you can even give some other good engines that can withstand what the cr125 can achieve. Ebay and Kijiji are difficult sources for me because most of the buys are from other countries (especially USA). Where can I buy them (for about 500$ ish) or you may suggest some other engines I can put on my go kart (dirt bike engines) that is as affordable.

Go on to craigslist and look at the lawn mowers there. You might need a gear box for that or lift the motor up higher for the beat to twist

Dirt bike chassis outlive the engines. It's unlikely you will find a used CR125 engine that has not been blown up.
You can buy the parts to build one new from Honda but you'll pay substantially more than $500.00.

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