Hi all.
2019 800 xc
Started the quad for first time this season and decided to take it around the yard. Acceleration from take off is normal but will not go past 40kph. Tried high gear, low gear no change. Checked mechanical throttle limiter, normal. Checked UNI air filter, all good. It gets up to exactly 40kph and starts surging. No idea what's going on. Any suggestions would be greatly appreciated.

Thanks.