The new Polaris belt part number 3211115 found on most of the new high performance models provides extreme durability and lasts extremely well. In fact, it will typically wear out prior to losing cogs or blowing. That is good for most of us, but we have seen this extended durability lead to tuning issues because of the belt wearing instead of blowing. This drive belt will wear narrower and narrower, and as it does, performance will be lost a little at a time.
It will reach a point where the operating RPM will start falling off on long pulls, and tuners will check almost everything else but the drive belt itself. The drive belt should always be the first thing you check when troubleshooting performance and operating RPM issues. The first question for those asking about consistency problems is, “How many miles does your belt have on it?” Usually, these riders have not changed their belt recently. They think the problem must be something else because the belt is still in one piece and visually looks okay. Just because it is in one piece with all of the cogs still there, it doesn’t mean it is still good from a performance standpoint.