Greetings to All - I recently purchased a 1996 Indy 600 and have no prior snowmobiling experience. From the get go, the machine had incredible power and I was quite surprised. Long story short, on my second ride I eventually noticed a lack of power and high fuel comsumption. Turns out that one of the plugs was fouled. We replaced it with a new one and once again it was very powerful and the difference was like night and day. Unfortunately, I probably rode 40 miles before I realized that I was running on only two cylinders. Is it likely that I caused any permanent damage to the engine??? Any other engine components I should check after my idiotic blunder? Thank you very much!