fmt2bx
Petty Officer 1st Class
- Joined
- May 27, 2015
- Messages
- 217
This is embarrassing but thought that someone might need the info, one day.... 
Ok, this friend of mine got this boat with a Force 50HP on it. Initially, we had some issues with one cylinder not firing properly. Turned out to be a misconnected wire from the trigger to pack.
We changed the impeller, fuel pump. new fuel lines, Carb all cleaned up, new plugs, replace lower unit oil.
Off to the lake we go to test and motor runs really well, idle good, reverse good, forward gear good and as motor revs the boat goes to plane nicely , all in all it was running very well.
Then suddenly, the motor revs up like crazy and boat decelerates.... In gear at idle works fine but as soon as you add power at some point the motor keeps raving but boat doesn't go any faster.
Looked like a spun prop hub. Prop looks good and no visible dents. We changed the prop (brand new) and same thing!!!!
We spent, hours checking, the crank shaft splines and gear shaft splines, everything looked good and it was becoming more and more like a case of something going on in the gear box....
About to give up when we realized that the exhaust snout was missing!!!!! Probably not attached properly after we replaced the impeller... On the 50HP the exhaust come out straight on top of the prop if there isn't any snout redirecting the gas.
That exhaust gas forced the prop to cavitate... Replace the exhaust snout and all good now.
Just wanted to share this experience, it is embarrassing indeed .
1
Ok, this friend of mine got this boat with a Force 50HP on it. Initially, we had some issues with one cylinder not firing properly. Turned out to be a misconnected wire from the trigger to pack.
We changed the impeller, fuel pump. new fuel lines, Carb all cleaned up, new plugs, replace lower unit oil.
Off to the lake we go to test and motor runs really well, idle good, reverse good, forward gear good and as motor revs the boat goes to plane nicely , all in all it was running very well.
Then suddenly, the motor revs up like crazy and boat decelerates.... In gear at idle works fine but as soon as you add power at some point the motor keeps raving but boat doesn't go any faster.
Looked like a spun prop hub. Prop looks good and no visible dents. We changed the prop (brand new) and same thing!!!!
We spent, hours checking, the crank shaft splines and gear shaft splines, everything looked good and it was becoming more and more like a case of something going on in the gear box....
About to give up when we realized that the exhaust snout was missing!!!!! Probably not attached properly after we replaced the impeller... On the 50HP the exhaust come out straight on top of the prop if there isn't any snout redirecting the gas.
That exhaust gas forced the prop to cavitate... Replace the exhaust snout and all good now.
Just wanted to share this experience, it is embarrassing indeed .
1
