Hi
I have a North River jet boat with a 350 chevy powering an AT-309 American turbine. I usually can get 3900 RPM and 39 MPH out of my boat. About 3 weeks ago and all of a sudden I lost top end RPM (about 3200 maxed out) and I can only get 34 MPH. I have dealt with fuel filters, added fuel additives cleaned the distributor and spark plugs look good. The engine only has 100 hours on it since rebuild. The leading edges of the turbine impeller does have nicks in it but American Turbine told me that would not make that kind of performance difference. Does anyone have any suggestions as what I might do. Thanks