Help identify this 2-stroke engine failure (Not from a ski)

Zero Client

Blowsioning my money!
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Joined
Sep 27, 2013
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148
Location
Marietta, GA
#1
Engine started life at 170psi, and was torn down 5 years later and still had 150psi and was still running like a raped ape.

No black mark under the crown. No signs of seizure.

Yes, its a dirt machine.

The owner is thinking maybe from coolant ingestion.

I'm thinking; sand ingestion? It doesn't resemble a bottom end failure to me - usually bottom end failure puts pin/rod type of damage. Could be detonation? Squish was at about 48thou. I'm not sure - I'm just trying to help identify the cause for someone.
 

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scotts2t

Head Woop!
Joined
Jul 17, 2009
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427
Location
Lake Erie
#2
does not look like bottom end failure to me, bottom end failure ususally leaves sharp dents of all makes and sizes from crank bearing races. does not look like detonation or water ingestion either. to be honest it looks like a small round ball shape of metal got sucked up or possibly a reed screw?
 
Joined
Dec 22, 2006
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161
Location
MotorCity
#3
Looks like a miniature version of when the screws blew out of my VForce 2 reeds. It is a mechanical event. Looks like something of constant consistency caused the dimples versus detonation.
 

DAG

No Risk It, No Bisquick
Joined
Apr 19, 2006
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3,543
Location
Charlotte, NC
#7
Photo of the dome with the black dot circled in red. Is that a hole or something embedded in the alluminum? Looks like whatever that is was making all the marks...
 
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