Hello,
When I bought it two years ago, my boat was powered by one 150HP Suzuki. Because I prefer dual engines for security, I bought two 1990 70HP Johnson and have rebuild them.
Before to use my boat, I have done some tests at home (without shifting) and both engines were OK.
Here's my problem : when my boat is in the water, if I shift forward or reverse, both engines stay at about 1000-1500RPM, even with full throttle.
No prop : engines work fines up to 5000RPM.
With prop : no power, max RPM about 1000-1500 ...
Props are 13 1/4 x 17 which seems to be correct for these engines.
I thought that maybe it was an electric safety system.
So, back to home, I have done some other tests without props but this time I shift forward and reverse. And engines worked fine ...
Any help would be greatly appreciated
When I bought it two years ago, my boat was powered by one 150HP Suzuki. Because I prefer dual engines for security, I bought two 1990 70HP Johnson and have rebuild them.
Before to use my boat, I have done some tests at home (without shifting) and both engines were OK.
Here's my problem : when my boat is in the water, if I shift forward or reverse, both engines stay at about 1000-1500RPM, even with full throttle.
No prop : engines work fines up to 5000RPM.
With prop : no power, max RPM about 1000-1500 ...
Props are 13 1/4 x 17 which seems to be correct for these engines.
I thought that maybe it was an electric safety system.
So, back to home, I have done some other tests without props but this time I shift forward and reverse. And engines worked fine ...
Any help would be greatly appreciated
