2018 GTR Slowly Losing Speed on WOT

[ckoosh]

I have a bit of a weird issue. In touring mode (default mode) on my 2018 GTR 230, if I get to WOT it will hit 60mph (which I know is not hitting theoretical max speed of 65, 66), then it will slowly lose speed over time. The speedometer will slowly tick down from 60 - 59, 58, 57... all the way to about 50-52 mph then it will stay there and hold the speed. The drop in speed happens slowly over about 30-40 seconds from hitting 60mph at the beginning.

It has about 200 hrs on it.

I changed the spark plugs, seemed to help a bit.

I plan on checking all supercharger hose fittings, checking the oil level as well, but if anyone can weigh in on what might be causing this I'd appreciate it.

 

[davus]

This might be a bit difficult to deduce, but can you tell if the speed of the ski is actually slowing down, or if it’s potentially really only hitting say 52 or so, and it’s just taking the GPS a little bit to regroup after you take off?

I’m not too familiar with those ski….should you expect more than 52mph out of them?

Do the revs also drop?…..or just the speed?