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Blown motor

Messages
4
Points
1
Boat Make
Yamaha
Year
2017
Boat Model
Jet Ski
Boat Length
NA
#1
Sorry I'm new here and new to jet skis but have a question and hoping I could get some guidance, I bought 2 Yamaha skis brand new last year each have around 10 hours max on them. I put them in the water and one ran for a few minutes and shut of and wouldnt start back up, so I took it back to the dealership and he pulled the plugs and said we flushed it wrong and it would be 6 grand to fix it..does this sound legit?
 
Messages
3,270
Ratings
2,994 93
Points
268
Location
Florida
Boat Make
Yamaha
Year
2014
Boat Model
Other
Boat Length
Other
#2
If you did it wrong and water went into the engines yes but get a second opinion . Never have the flush water running into the engine if the engine is shut off
 
Messages
4
Points
1
Boat Make
Yamaha
Year
2017
Boat Model
Jet Ski
Boat Length
NA
#3
Is there any other circumstances that could cause this? I feel like I did flush it correctly and that there is another issue, but maybe not?
 
Messages
3,270
Ratings
2,994 93
Points
268
Location
Florida
Boat Make
Yamaha
Year
2014
Boat Model
Other
Boat Length
Other
#4
Anything is possible so try to get someone else to look at it if you did not leave the water running with the engine off and that takes a few minutes for the water to fill up the exhaust system and then get up into the engine also towing one with the engine off canl do the same thing
 
Messages
3,270
Ratings
2,994 93
Points
268
Location
Florida
Boat Make
Yamaha
Year
2014
Boat Model
Other
Boat Length
Other
#6
no I seriously doubt it
 
Messages
3,270
Ratings
2,994 93
Points
268
Location
Florida
Boat Make
Yamaha
Year
2014
Boat Model
Other
Boat Length
Other
#7
The original poster did not really give detailed facts about the situation so it is all subjective
 
Messages
3,270
Ratings
2,994 93
Points
268
Location
Florida
Boat Make
Yamaha
Year
2014
Boat Model
Other
Boat Length
Other
#8
another possibility is the ski was rolled upside down in the water and it ingested water from that, rolling it back the wrong way can do it.
Another possibility would be the engine ran hot and warped a head or blew a head gasket
 
Last edited:
Messages
4
Points
1
Boat Make
Yamaha
Year
2017
Boat Model
Jet Ski
Boat Length
NA
#9
I gave all the details I have, they both ran fine one weekend and the next we put them in the water and it started I put it in reverse and backed out and when I switched to drive and hit the gas it immediately shut off, unless a neighbors kid hooked up the hose and let it run it was flushed properly.. but somehow water got in the motor and it's a mystery, the Yamaha dealer said it had to be flushed wrong for this to happen...with less than 10 hours you would thing the dealer you bought them from would try and help out...I have it scheduled to let another dealer look at it, I will report back when we see why this happened...thanks for the ideas on what could've happened.
 

swatski

Jetboaters Fleet Admiral
Messages
8,796
Ratings
9,442 138
Points
493
Location
Saint Louis, MO
Boat Make
Yamaha
Year
2016
Boat Model
AR
Boat Length
24
#10
I gave all the details I have, they both ran fine one weekend and the next we put them in the water and it started I put it in reverse and backed out and when I switched to drive and hit the gas it immediately shut off, unless a neighbors kid hooked up the hose and let it run it was flushed properly.. but somehow water got in the motor and it's a mystery, the Yamaha dealer said it had to be flushed wrong for this to happen...with less than 10 hours you would thing the dealer you bought them from would try and help out...I have it scheduled to let another dealer look at it, I will report back when we see why this happened...thanks for the ideas on what could've happened.
If the engine hydrolocked due to flush water intrusion it really wouldn't start, would it? Is this a 1.8 or a MR-1 ski?

--
 

MidnightRider

Jet Boat Junkie
Messages
532
Ratings
591 11
Points
128
Location
Oronoco, MN
Boat Make
Yamaha
Year
2017
Boat Model
X
Boat Length
21
#12
If the engine hydrolocked due to flush water intrusion it really wouldn't start, would it? Is this a 1.8 or a MR-1 ski?

--
I agree with @swatski, no way a hydrolocked engine would start up and run before it died. Or a better way to say it is when an engine hydrolocks it doesn't start, it hydrolocks from being turned over - no? If it can, someone please educate me.
 

swatski

Jetboaters Fleet Admiral
Messages
8,796
Ratings
9,442 138
Points
493
Location
Saint Louis, MO
Boat Make
Yamaha
Year
2016
Boat Model
AR
Boat Length
24
#13
It's the vx deluxe high output 1.0
That would basically rule out the timing chain issue (breaking in some 1.8s).
Any chance there would be water in the engine bay that would be sucked in after start, for example due to rain or due to exhaust cooling clamps falling off?

--
 

Cody700

New Member
Messages
7
Ratings
4 2
Points
1
Boat Make
Yamaha
Year
2019
Boat Model
Other
Boat Length
PWC
#15
Has the ski been frozen? This doesn't add up to me at all. If you had it running and it locked up when it was put in forward, it sounds like you took something into the impeller and locked it up. I have had that happen, sucked up a rock and locked it tight. Pulled the nozzle and replaced the impeller and all was well. There is more to this story it seems.
 
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