What you have to watch out on the Yerfs like that is how the adjustment system (both belt and chain) are set up. I can't quite tell from yours, but the way ours was set up, there was a main plate that could move to allow you to adjust the jackshaft location and then the engine could move on top of that plate. The problem it presented (using a fantastic Robyn Suburu engine was we had to extend the slots that the engine mounted to. It was a PITA but it did work. Although the mounting holes are the same bolt pattern, what is different is where the shaft sits in comparison to the factory engine.
Harbor Freight does in fact have some kick ass sales on their clone engines. We have run many of those engines and ran the piss out of them and they held up great. There is a company called SmallEngineWarehouse that runs on ebay and has their own website that were the best place we found to deal with price wise when looking for new go kart engines. The Robyn 7hp engine typically listed for $600 +/- and they had it on ebay for $330 shipped. A super engine.
I will also offer this advice, after we did this, for the amount of money we had in the machine, we could have found a decent mini buggy. We sold he yerf, and bought our first Helix and never looked back. Night and day difference.
Good luck!
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