Bax Reference my post on 1/17/2006, I receive another new ST 2300 from Tower today which is for another big plane, put a prop on it and a few drops of after run on the piston and it has wonderful compression like my ST3000. I have put about 2 gallons thru the first ST 2300 and it has about 30% compression of the new one. Would like to send it back to have you look at it. Was purchased 12 /10/2004 from Tower and just started to break it in this month. Have a printable copy of the Tower order confirmation but not the original billing invoice to enclose with it. Bob Ohio