polaris 1050 slxh revs so far and sounds like it goes in to a safe mode???

Hello there could anyone help with this realy annoying problem, a while back i was on the water with my ski it was going fine then it got a problem, it starts and revs fine but the rev range goes up so far and it sounds like its hitting a rev limiter, since then i have had a look around the engine and noticed my oil pump was knackered, i have replaced the oil pump and the ski still has the problem, i was wondering if this ski has some sort of safe mode or if its something abit more than this, would realy appreciate any help i could get with this

Thanks

Brad