zmachines
Active Member
- Messages
- 4
- Reaction score
- 2
- Points
- 42
- Boat Make
- Yamaha
- Year
- 2012
- Boat Model
- Limited S
- Boat Length
- 24
Hoping to find some help/guidance after reading though all what could be an issue.
Background: Fresh water only 2012 242 LS boat. Purchased boat in August of 23. 240hrs on motors. Previous owner replaced intermediate bearings, impellers, and wear rings for both engines. Said he had bad cavitation and low on top end speed. When we met, I took the boat for a 2-3hr test ride with him, and all felt good/fine from what I could tell (my first jetboat).
Last summer around this same time we starting to notice a whine in the starboard side motor. I thought maybe intermediate bearing installed issue from his work and check grease levels, continued to monitor (and read up on potential causes). Noise increased on next two outings with a rear bearing failure. I pulled the jet pump and found water in the nose cone along with the destroyed bearing. I replaced all moving parts and orings/seals including a new nose cone just to be safe. After the repair we took it back out for a test ride and things were quiet and ran smooth. The starboard "assembly" always seemed to be slighter louder than the port side (Trying 1 motor at a time at very low speed).
This past weekend almost a year since last time, we heard the same whine coming from the starboard side again. We may have put 40 hours on the boat since last summer (lake life to the beach area is a short distance for us). I am at a loss of what it could be. I suspect when I pull the pump and open the nose cone, I will find water in the bearing assembly again and need to tear down replace the same parts.
Again, the one difference we both notice from port to starboard (when I first purchased and after my repairs last year) is a slight difference in sound. Port is quite, maybe a vibration on starboard side that gets worse and allows water in, I'm not sure.
I want to correct the problem the right way, but unsure where to look now. Any ideas? - Michael
Background: Fresh water only 2012 242 LS boat. Purchased boat in August of 23. 240hrs on motors. Previous owner replaced intermediate bearings, impellers, and wear rings for both engines. Said he had bad cavitation and low on top end speed. When we met, I took the boat for a 2-3hr test ride with him, and all felt good/fine from what I could tell (my first jetboat).
Last summer around this same time we starting to notice a whine in the starboard side motor. I thought maybe intermediate bearing installed issue from his work and check grease levels, continued to monitor (and read up on potential causes). Noise increased on next two outings with a rear bearing failure. I pulled the jet pump and found water in the nose cone along with the destroyed bearing. I replaced all moving parts and orings/seals including a new nose cone just to be safe. After the repair we took it back out for a test ride and things were quiet and ran smooth. The starboard "assembly" always seemed to be slighter louder than the port side (Trying 1 motor at a time at very low speed).
This past weekend almost a year since last time, we heard the same whine coming from the starboard side again. We may have put 40 hours on the boat since last summer (lake life to the beach area is a short distance for us). I am at a loss of what it could be. I suspect when I pull the pump and open the nose cone, I will find water in the bearing assembly again and need to tear down replace the same parts.
Again, the one difference we both notice from port to starboard (when I first purchased and after my repairs last year) is a slight difference in sound. Port is quite, maybe a vibration on starboard side that gets worse and allows water in, I'm not sure.
I want to correct the problem the right way, but unsure where to look now. Any ideas? - Michael
