I'm sure your Tec engine is about the same as mine as far as the breather is concerned. I was given the engine, which came off a parking lot sweeper. The engine block had just been replaced with a new "short block" so it's a really a perfect engine. However, it would blow oil out the breather even at low RPM. I took off the breather and noticed that the "reed" valve, that works as a one-way-valve, was slightly defective and not sealing the round hole that it covered. I drilled the rivets that held the reed in place, straightened it so it sealed better, and stuck it back on the engine.....no more problem at any RPM.