I have a few 2 stroke bikes. Neither smoke while running, but the race engine can ocassionally burp a bit with rapid throttle changes. The stock 1970s engine do

I have a few 2 stroke bikes. Neither smoke while running, but the race engine can ocassionally burp a bit with rapid throttle changes. The stock 1970s engine does not even smoke on startup. I usually replace the auto-oilers with premix for reliability. If an oil-injection system fails, signifigant engine wear occurs.