My engine behaves  erratically below 16" and it changes due to factors like
uneven
  mixing of 2stroke oil with avgas (all I can find) on cross-country trips,
and variable
  (crankcase) oil consumption due to my overheated rotor [oil scraper] "O"
rings.

  I got a new rotor housing from Mazdatrix so I will put the new engine
  together with your TES orings soon I hope, probably will not install
  it before Sun-n-fun. Yes I hope to make it there again this year and
  looking forward so seeing everyone there.

  I hate to bring this up, but once the oil scraper "O" rings start to go, it
can get bad
  very quickly. One day the thing just smokes a little bit and the tail pipe
is black and
  greasy looking. The next day, (in our case the next weekend) at
Indianapolis
  Raceway Park, white smoke is billowing out of the exhaust and the oil level
is down
  a quart in one lap. I took it apart at home and discovered that one "O"
ring on one
  rotor was in 20 pieces, with some of the pieces on top of others.
Impossible I would
  have thought. The other ring on the same side of the same rotor had one
break in it.
      So you can get very close to the edge and not be sure, and then
suddenly you
   are over, and you need a place to get down quickly.

   Lynn E. Hanover

Lynn do us a favor and try those teflon encap silicone oil scraper O-rings
next time you rebuild an engine. They are cheaper than the Mazda stock
O-rings.

Paul Lamar
 
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I checked the installation of the oil O-rings with the new
sizes I got from Creavey. They worked perfectly and were
very easy to install. You will need a little O-ring lube
and a 2 by 8 to install them. They were also easy to remove
with no signs of distortion.

One of the secrets is if you reuse the old oil scraper rings
they must be spotlessly clean inside and out. Soak them
in carb cleaner for a few days. If you use new scraper rings
this will not be a problem of course.
The second thing to watch out for is don't nick the 
rotor wall between the two scraper rings when you remove them.
Very very important!!

Hopefully we can talk Dave Lemon into stocking these custom size
teflon encap silicon oil O-rings. Everybody send a message to 
Dave at Mazdatrix :-) As I said these can be the same or just a 
little more than the stock oil O-rings from Mazda.

The proper sizes are:

0.093" section 4.68 inch ID 
0.118" section 4.33 inch ID 

I can vouch for the quality of the Creavey O-rings but some 
of those water TES o-rings from Mcmaster Carr I have seen 
are not as good. This is not to say they won't work. They just 
don't look as good around the joints as Creavey O-rings.
 

Paul Lamar