Juan Negron
Jet Boat Lover
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- puerto rico
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- Yamaha
- Year
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Clean out are in Thanks!n Nice Boat looks like mine!
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Problem 2007 Yamaha Jet boat
- Thread starter Juan Negron
- Start date
- Messages
- 13,385
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- 13,502
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- 857
- Location
- Royal, AR
- Boat Make
- Yamaha
- Year
- 2007
- Boat Model
- SX
- Boat Length
- 23
Can you post pictures of your impellers?
This FAQ entry will be helpful if you do have a problem with the driveline. how to replace your impeller / impeller bearings /liners
Juan Negron
Jet Boat Lover
- Messages
- 18
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- 6
- Points
- 77
- Location
- puerto rico
- Boat Make
- Yamaha
- Year
- 2007
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- SX
- Boat Length
- 21
Bruce the Impeller looks good I think the splines on the drive shaft are bad!
- Messages
- 13,385
- Reaction score
- 13,502
- Points
- 857
- Location
- Royal, AR
- Boat Make
- Yamaha
- Year
- 2007
- Boat Model
- SX
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- 23
I have never heard of spline problems but removing the pump and shaft to check the splines is quick and easy. This thread will help https://jetboaters.net/threads/yamaha-jet-pump-disassembly-from-grant-browne-youtube.446/
Juan Negron
Jet Boat Lover
- Messages
- 18
- Reaction score
- 6
- Points
- 77
- Location
- puerto rico
- Boat Make
- Yamaha
- Year
- 2007
- Boat Model
- SX
- Boat Length
- 21
Bruce the impeller housing which I replaced thinking it was bad with a stainless steel unit, do I need a wear ring on this? I have the shaft and mid shaft out everything is tight I'm really confuse about this whole system!
- Messages
- 13,385
- Reaction score
- 13,502
- Points
- 857
- Location
- Royal, AR
- Boat Make
- Yamaha
- Year
- 2007
- Boat Model
- SX
- Boat Length
- 23
The factory impeller housing is made of aluminum with a stainless wear ring built into it. Some aftermarket housings use plastic wear rings.
If the gap between the impeller and the housing is not correct it will cause cavitation which will be noisy and reduce thrust significantly. Anything caught in the tunnel, on the impeller or shaft will do the same. Some have had cavitation issues that were caused by the silicone around the pump peeling off.
Juan Negron
Jet Boat Lover
- Messages
- 18
- Reaction score
- 6
- Points
- 77
- Location
- puerto rico
- Boat Make
- Yamaha
- Year
- 2007
- Boat Model
- SX
- Boat Length
- 21
Another question Bruce when I install everything back together should some type of silicone be applied in between each housing?
- Messages
- 13,385
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- 13,502
- Points
- 857
- Location
- Royal, AR
- Boat Make
- Yamaha
- Year
- 2007
- Boat Model
- SX
- Boat Length
- 23
This thread documents what is needed and where https://jetboaters.net/threads/impeller-bearings-trashed-lots-of-rebuild-pics-pg-6.2822/#post-45245
I used the best approximation that I could find for what was specified in the user manual. I visited my local Yamaha dealer trying to source the specified materials but they were not helpful.
I used the best approximation that I could find for what was specified in the user manual. I visited my local Yamaha dealer trying to source the specified materials but they were not helpful.
tdonoughue
Jetboaters Admiral
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So I have a question: How do you know that the engine is going but that the impeller is not moving? Did you run it on the hose and look?
Big Shasta
Jetboaters Captain
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If you have ever had a manual car with a bad clutch (rpms go up but speed doesn't) that's what cavitation feels like. It could be as simple as missing silicone around your driveline allowing air to get in.
tdonoughue
Jetboaters Admiral
- Messages
- 4,945
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- Points
- 417
- Location
- The Woodlands, TX 77381
- Boat Make
- Yamaha
- Year
- 2012
- Boat Model
- AR
- Boat Length
- 24
@Big Shasta , you are right. But in those cases, the impeller is moving, just not being effective (due to cavitation). I was re-reading the OP and he said that the impeller was not moving. So I am trying to figure out if it just FEELS like that (in which case it could be cavitation) or if it is actually not moving (in which case it could be bad clutch, something jammed in the impeller or, least likely I think, the impeller splines).
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