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try searching for tight valves in the Nytro and Viper forums. The valves in these motors like to get tight way before the 25k mile check Yamaha suggests. When they do, they create the symptoms you describe. There should be many posts on this that will help you determine if this is your problem and then how to fix it if it is the problem.
I've read several posts and seems you have much experience with nos, that being said i have an old apex i want to add it to for racing buddies on the lake. Any help or suggestions would be helpful thanks
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this would get a better response as a private message to him directly.
Help with my 2014 Viper

I feel like my front skis aren’t sticking on the viper compared to my buddy’s Skidoo. Any reasons for this? Also I think I need to replace my exhaust, starting to get loud and rattling. Any recommendations on what to replace it with that will fit and I won’t have to have anything adjusted for it to work?