No 2 does! I had a pump/regulator problem with No 1. I about wore the needles out trying to get a consistant setting to no avail. I was asked to return the engine to be serviced. It was replaced with a new one due to the non availability of parts for the pump or regulator. This engine has a very narrow high needle setting. I am using 15% Omega with 4 oz extra castor added. I believe this engine needs a lot of running in very rich! I ran a gallon thru each one before flying. Talk to Bax. He will get you fixed up!