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Guys I need some help. I bought this engine off my buddy and it ripped in his ski. Only thing that really changed is the carbs that were on it. He had dual NOVI 48mm and Im running dual stock 38mm. It will start and idle fine but when I punch it, it has no power. Its like riding a JS440. BUT if...

Recently picked up a ski that I plan to part out. I noticed it has an rc520 westcoast cylinder on it. Anyone know what its worth? No scaring in the bores, looks really good. Thanks!