Can anyone tell by these pics what could have caused engine failure in new engine?

[DJMky]

Went ahead and pulled the head today on the RX 951 that I purchased from a friend of the family. The background on this ski is that the engine went bad and they paid a certain shop in PA to do a rebuild which was around $1800. Upon getting the ski back on the water a few hours later it dropped compression in one cylinder and they stuck it in the garage where it set for a year until I recently bought it.
After doing a compression check and getting 125 on the front (the piston with the black coating) and a 25 on the rear cylinder (the chipped and hammered looking piston) i pulled the head and took some pics.
I noticed the front piston had a stamp on the piston and the rear did not. looks like it was honed and maybe a larger piston used? The rear piston just looks like it has been beat to death.
Anyone have an idea as to what would cause this? I plan on buying a new engine because the ski is mint but I don't want to install it and then have the same thing happen to me.
Thank you guys!!!!

 

[brianmcb]

I would guess the one piston was installed backwards and broke a ring maybe


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[AdamXP800]

Did it snag a piece of a rave valve on a ring? Do you have any pictures of the hole piston, it looks like the exhaust side of the piston is cut off in the picture?

 

[Krispy]

My guess:

Ring snagged on a port and broke, causing chunks of metal to beat up the head and piston.

Second guess is that the shop that did the rebuild only did a top end (or partial top end) and left some foreign material in the bottom end (metal chunks) that found their way to the top during the run-in. Kablammo!

Best of luck finding the cause!

 

[SabrToothSqrl]

you know that shop has1 and 2 year no fault warranties on their rebuilds...

had they pulled it and sent it out to the shop, I bet it would have been rebuilt

Google Seadoo Engine Shop

If you are saying one is over sized and one is not, I'm not sure this shop did the work. I can't imagine they wouldn't do both... that just seems fishy to me.

Whatever shop you go with, and I do suggest you use a shop, make sure you get a no fault warranty. I
I've sent 3 engines there, or was it 4? anyway, I've been very satisfied w/their work.

the instructions don't say it or maybe they do now, but send your RAVEs with the engine, so they can be trimmed if needed.

also, the 951 REQUIRES XPS-II oil, or the equivalent.

do not run joe's chicken shack tcw3 oil... it will kill the ski...