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Cylinder down, need advice

Leaving a machine outside over summer under a tree or with a cover on it will rust the inside of the engine and bearings. Seen it first hand many times on customers sleds.

It looks as though that rod has some blue coloring to it too. If it is that crank is on borrowed time before the rod seizes.
 
The picture looks like some blueing, but in person, it doesn't look blue, just rust. I will flush the oil lines and if that checks ok put it together and hope. I dried the mag side as some antifreeze had spilled. the rods seem to be attached smoothly with little slop if any slop. Thanks for the help. kinda fun to do it myself, I hope it runs when I'm done.
 
thought the same thing whe i threw the fix in mine goforbroke. worked out really good as my sled flat out rips; you'll do fine.... just take your time and do it properly.
 
Detonation

I am not sure why no one has brought this up yet but the piston looks like classic detonation due to lean condition. Especially after looking at the other piston. There is no wash on the piston suggesting the sled is running really lean on both cylinders. The mag side just went first. It looks like the outside edge of the piston especially around the exhaust port is eroded away and all the splatter on the head looks exactly like too lean then BOOM. Look at your fuel system!
 
I am not sure why no one has brought this up yet but the piston looks like classic detonation due to lean condition. Especially after looking at the other piston. There is no wash on the piston suggesting the sled is running really lean on both cylinders. The mag side just went first. It looks like the outside edge of the piston especially around the exhaust port is eroded away and all the splatter on the head looks exactly like too lean then BOOM. Look at your fuel system!

Sent injectors in to witchhunter and replacing fuel filter, will have dealer set TPS once back together. Anything else I need to or can do with the fuel system?
 
I am not sure why no one has brought this up yet but the piston looks like classic detonation due to lean condition. Especially after looking at the other piston. There is no wash on the piston suggesting the sled is running really lean on both cylinders. The mag side just went first. It looks like the outside edge of the piston especially around the exhaust port is eroded away and all the splatter on the head looks exactly like too lean then BOOM. Look at your fuel system!

Having spent over a decade building race engines for watercraft, the first thing I thought of when I saw the picture was detonation.

Wayne
 
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