Do 2-stroke engines have oil filter?

It is my impression that 2-stroke engines don't have oil filter.

So where do the metal filings (wear off from engine parts) go? Do they get
ejected out the exhaust?

 

Conventional two strokes don't recirculate oil so they have
no filter. There shouldn't be a significant amount of filings
produced by either a two or four stroke engine proper.

Motorcycle gearboxes can certainly produce some fine
metal powder. On a bike where the engine and tranny
share a common oil supply, you may see some small amount
of filings from the gears. Two strokes typically lubricate their
gear train separately.

If you ever see large amounts of filings, some expensive
damage is likely in progress. DAMHIK.

 

If some steel part, like the needle bearing in the top of a rod, was
shedding metal, the engine would occasionally stop running when the
spark plug gap was bridged.

You might be mystified as to the source of the bridging and wonder if
you were maintaining your air filter properly. Then, one day, your
machine might quit in the middle of a race and you might wonder where
the rod bearing went when you tore the engine down.

Don't ask how I know this...

 

Bits of piston, ring, reed valve, power valve, yesterday's copy of the
Times - anything and evertthing gets chucked out of a stroker's exhaust.

 

Plug bridging - usually called "whiskers" - on 2-strokes is most commonally
deposited carbon not metal, caused by poor quality oil or having the
fuelil ratio too high either in the premix or pump settings. This can
also occur if the transmission seals fail and gearbox oil is sucked into the
crackcase.

You *assumed* the bridged plug and mechanical failure were linked. Main
bearing failure can cause the trans seals to leak but the connection to the
plug bridging is secondary.