I have done lots of reading on the SportJet 120 on these forums and others. I have also stopped in at the local repair shops to chat with the mechanics an even shop managers to see if I can get some direction on this issue. The forums have been more helpful, but I would like to confirm my suspicions...
The boat starts, idles, and drives perfectly fine, except at WOT. I can be at 90% and it is fine, but that last little bit causes the motor to make a sound like something just isn't right. It sounds and feels like a vibration coming from the motor somewhere or like the boat is losing power and or cavitating... I don't have a better way to explain it unfortunately.
I have read that the rev limiters can go bad on the Force 120 motor, but my boat doesn't have a tach. I am going to go look for one used at the local salvage so I can hook it upto the motor to see where I am running. Does anyone here know what the reference RPM should be at WOT? Also do you know what wire is the tach wire on this motor?
I know there is some wear on the wear ring from the previous owners. I was hoping to get another season out of it before having to look into a rebuild. I know that will cause performance issues, but can it also cause the vibration noise?
The boat starts, idles, and drives perfectly fine, except at WOT. I can be at 90% and it is fine, but that last little bit causes the motor to make a sound like something just isn't right. It sounds and feels like a vibration coming from the motor somewhere or like the boat is losing power and or cavitating... I don't have a better way to explain it unfortunately.
I have read that the rev limiters can go bad on the Force 120 motor, but my boat doesn't have a tach. I am going to go look for one used at the local salvage so I can hook it upto the motor to see where I am running. Does anyone here know what the reference RPM should be at WOT? Also do you know what wire is the tach wire on this motor?
I know there is some wear on the wear ring from the previous owners. I was hoping to get another season out of it before having to look into a rebuild. I know that will cause performance issues, but can it also cause the vibration noise?