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Need help with cavitation on Yamaha VX Cruiser

Jameson Clark

Well-Known Member
Messages
326
Ratings
175 6
Points
58
Location
Duncan, SC
Boat Make
Yamaha
Year
2017
Boat Model
X
Boat Length
21
#1
Since getting my 212x this spring, I have realized how much knowledge there is on these forums, so instead of trying to join a jetski site, I figured I would reach out to y'all that I've gotten to know instead.

I have a 2007 Yamaha VX Cruiser that me and my brother and sister inherited when my father passed away in 2014. All three of us also have boats so the ski only gets used a few times a year when we all get together on the lake for the weekend. Otherwise, it just sits around.

Anyway, recently when we've taken it out, it still runs great and purrs like a kitten but it has lost all its power out of the hole. Still runs about the same top speed (46-52 depending on rider and water) but it just shoots straight to the rev limiter coming out of the hole until it starts building some speed. So, I have learned enough this year about my boat to know this is cavitation, but I have no clue what to look for as the cause. Can anyone point me in the right direction to start figuring it out?? Thanks for any help!
 

itsdgm

Jetboaters Admiral
Messages
3,336
Ratings
2,034 16
Points
273
Location
Rancho Santa Margarita, California
Boat Make
Yamaha
Year
2007
Boat Model
AR
Boat Length
21
#2
Check the pump and pump shaft for any debris (even a piece of fishing line can cause cavitation). Also check the impeller for damage. Finally, look to see if there’s any sealant missing in the intake or pump area.
 
Messages
3,236
Ratings
2,974 93
Points
268
Location
Florida
Boat Make
Yamaha
Year
2014
Boat Model
Other
Boat Length
Other
#3
As previously stated there is probably something sucked up in the pump it only takes a small amount of plastic or a fishing line to cause serious loss of hole shot, look in the pump but often it is between the impeller blades and not easy to see .
 

Jameson Clark

Well-Known Member
Messages
326
Ratings
175 6
Points
58
Location
Duncan, SC
Boat Make
Yamaha
Year
2017
Boat Model
X
Boat Length
21
#5
I will try to get some pics taken tomorrow morning before Florence gets here. Thanks for the help guys!
 

Seadeals

Jetboaters Lieutenant
Messages
774
Ratings
808 9
Points
173
Location
Greenville, South Carolina
Boat Make
Yamaha
Year
2006
Boat Model
SX
Boat Length
21
#6
They pretty much covered it. If you ever decide to sell it, let me know. We are close and I eventually want a ski that matches my 2006 SX210 engines. I like the idea of running a fleet with the same engines. I got a small impeller ding on the leading edge that caused cavitation. It was small enough I was able to dress it out and restore performance. Hopefully Florence will “peter out” but who knows.
 

Jameson Clark

Well-Known Member
Messages
326
Ratings
175 6
Points
58
Location
Duncan, SC
Boat Make
Yamaha
Year
2017
Boat Model
X
Boat Length
21
#7
I was able to get a picture of the impeller from the rear of the ski. Nothing really obvious caught in there anywhere. Couldn't get a picture from the bottom, but I'll pull the grate and get a picture from there this weekend. There are some dings on the impeller, just don't know if it is enough to cause this much cavitation. Impeller.jpg
 
Messages
3,236
Ratings
2,974 93
Points
268
Location
Florida
Boat Make
Yamaha
Year
2014
Boat Model
Other
Boat Length
Other
#8
Like I said it is probably in between the blades and you can't see it looking in the pump, you may need to pull the pump to see what is in it.
Your leading edges look dinged up . In comparison I have over 600 hours on my impellers and way less dings on the edges so you may be backing off the trailer or beach or something similar like hitting reverse when cruising into shallow water kicking up rocks shells etc into the pump. Just possibilities.
 

Jameson Clark

Well-Known Member
Messages
326
Ratings
175 6
Points
58
Location
Duncan, SC
Boat Make
Yamaha
Year
2017
Boat Model
X
Boat Length
21
#9
Like I said it is probably in between the blades and you can't see it looking in the pump, you may need to pull the pump to see what is in it.
Your leading edges look dinged up . In comparison I have over 600 hours on my impellers and way less dings on the edges so you may be backing off the trailer or beach or something similar like hitting reverse when cruising into shallow water kicking up rocks shells etc into the pump. Just possibilities.
There is absolutely no telling! This was a rental ski my Dad bought for his house boat quite a few years ago. When he passed away, we got it for the grandkids of the family (me and my siblings kids) and it gets ridden by them when we go out and others with little jet ski knowledge about beaching and such.

How big of a job is it to pull the pump on these?
 
Messages
3,236
Ratings
2,974 93
Points
268
Location
Florida
Boat Make
Yamaha
Year
2014
Boat Model
Other
Boat Length
Other
#10
It isn't all that difficult to pull the pump as long as it isn't stuck .I have a special slide hammer I made just for getting the pump out when it is stuck. if there is something large in the impeller you would not be able to get it to go very fast so what ever it is either damage to the impeller or some fishing line , small piece of wood or some other item lodged between the impeller blades usually you have a better shot of seeing it from under the ski looking up in the intake grate.
 

Jameson Clark

Well-Known Member
Messages
326
Ratings
175 6
Points
58
Location
Duncan, SC
Boat Make
Yamaha
Year
2017
Boat Model
X
Boat Length
21
#11
It still runs 45-50ish, just takes forever coming out of the hole.
 
Messages
3,236
Ratings
2,974 93
Points
268
Location
Florida
Boat Make
Yamaha
Year
2014
Boat Model
Other
Boat Length
Other
#12
Sometimes if you just pull the intake grate you can see up in between the impeller blades from under the ski. I believe it will be some small object or piece of plastic I can't begin to remember all the things I have had lodged in my jet pumps from plastic shopping bags to toys and once a flattened beer can , once I even got hung up on a cast net someone threw from a bridge and just left it in the water when it became entangled under the Tierra Verde bridge.
 
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