Superjet Engine about to die?

[TTD120]

Hey guys. I have some issues with my stock 650. Last season i opened the hood on it after riding it the previous day and noticed the ski was filled with a white milk-like liquid. And when I started it, the ski was super loud and sounded like a piston was rapping. And I have never had any problems with this ski since purchased. Now since I'm trying to get my custom build done (and finish this semester up) and don't know a whole lot about hardcore engine work, I sent it off to a Yamaha repair shop. $250 later all they did was put new plugs in, without even starting the ski! I included a video of it running, so hopefully you guys have a clue what the problem may be and what options I have to fix it. I'mafraid to run it and see how it performs in fear of blowing the engine or making something worse. Thanks

 

[SJBrit]

That sounds lean, and the milky stuff is emulsified oil that has been in contact with water. Both things point to a leak somewhere, probably in the cases. Sounds like you have too much air getting in, and fuel getting out.

 

[augustaf]

That is so sad! It would appear there was water in the engine and a rod bearing wore out. It would require a crank shaft ($195 SBT) at this point. What is really sad is that a Yamaha repair shop would screw you like that. -250 for spark plugs!

 

[SJBrit]

Probably a main bearing actually, but same remedy.

 

[Shadow7874]

yep, may want to start looking for a 701 to drop in there. I had a bearing go out on my crank and im already over $300 into the rebuild with some killer deals on parts too. Save your time and money and find a good used 701 here on the X (everyone told me to do the same but i kinda figured a rebuild wouldnt cost a whole lot, i was wrong...)

 

[TTD120]

Ugh thats what I was afraid of. I'm still trying to finish up a 760 rn buildup but college has forced me to take a break from that project for another week until finals end. I was hoping to have this one to enjoy until my other one is done, but oh well. Thanks for your input guys!