can'tll for sure, but those look like VX76 250's, they are the fuel drinkest things Yamaha ever built. They use 6 1 bbl carbs and have an enrichment circut on each engine that goes haywire and makes them burn even more full. If they were the OX66 250's they'd be a better deal. The VX were great motors,, just built when gas was a lot cheaper. Biggest thing I've heard of them doing was wrist pin bering issues on the top cylinders, I don't know what causes it, but I've seen several that have had that problem. Seen the probelm repaired without even pulling the power head
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