Back to back top ends 800etec (HELP)

[newbie123]

Hey guys

So last winter i had the MAG side go on my 2016 800ETEC with 4000km on motor, Picked up a used long block motor
it was a 2014 2500km ruffly on motor installed it and got three rides on the motor and PTO side went, Sled was never overheated maybe 1 bar over a few times when trail riding nothing serious, Here are some pictures of the pistons looking for some guidance on what is happening?

 

[ABMax24]

Was it using oil? Kinda looks like lack of lubrication to me, pinched oil line or failed oil pump?

 

[Lund]

That looks like cold seizure damage. You let your sled get to operating temp before getting on the throttle or are you a brapper right out the parking lot?
Over expansion of skirting is usually caused by poor warmups.

 

[mclean]

Looks like oil to me.

 

[maxwell]

When you installed second motor how did you prime the oil system? Did you add any premix to first tank?


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[oler1234]

piston top/wash looks good.

side skirts look like zero oil.

Something to note is the exhaust - transfer ports crack on the etec. It is a rare case but does happen, check to make sure yours is not cracked on the cylinder wall in this area. could be a culprit in addition to lack of lubercation.

 

[lilduke]

Maybe buddy sold you a bunk engine.

Ya 2500km dude, lady driven...

 

[catmando]

Maxwell is right, when rebuilt it need too be hooked up to the budd system and run the oil pump too get the air out of the lines . Lack of oil??