07 arcticat prowler running issue

Hey, i have an 07 arcticat prowler side by side, and this used to go 50mph before the rev limiter would kick in. Now it only hits 30 mph and the rev limiter kicks in. Put the machine up on jacks stands and it still does it, load or no load on it. When the speedo hits 30 the rev limiter kicks in, disconnected the speedo sensor and it still does it. I'm thinking cdi box. Any input appreciated. Thanks Todd
 
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