FA20 oiling problems, study and solution

[smackrel]

Originally Posted by bcj

Attachment 227630

What is this from?

and also is that John Candy?

[NoHaveMSG]

Originally Posted by blsfrs

My FA20 "seized" because of a broken piston.

That was a good one. Wonder what ultimately caused that? I used to see kind of similar failures on 4 stroke motocross bikes when they came out. Worn piston would break the skirt off and shove it into the head sideways then throw the rest of it through the bottom of the engine.

[blsfrs]

Originally Posted by NoHaveMSG

That was a good one. Wonder what ultimately caused that? I used to see kind of similar failures on 4 stroke motocross bikes when they came out. Worn piston would break the skirt off and shove it into the head sideways then throw the rest of it through the bottom of the engine.

A couple of years prior to this, the engine ingested something into cyl #3. It chucked 2 rocker arms and broke the timing chain. The top of the piston looked "peppered" but otherwise didn't appear damaged. The engine was reassembled with new rings, bearings, etc.. As I remember, the pistons were even sent out to have the skirts recoated.

I suspect the piston had damage that wasn't evident on a visual inspection. Hence: boom.

[bcj]

Originally Posted by smackrel

What is this from?

and also is that John Candy?

SCTV (1976-84) Canadian. Yes, John Candy. The other is Joe Flaherty.
They've done some stuff since then. Only blowed up sorta a little.