Bootleggers set up works fine. Fuel can be SIG Champion 10/10/10, I pour out 4 oz of fuel and add 4 oz of SIG Castor oil. Engine runs fine, doesn't overheat and holds needle just fine. I don't tach it, just set it so its just breaking in and out before launch. Rocket launch, after about a lap or so it settles down and stays that way through the flight. Little speed up burps at the end of tank, gives plenty of warning. I use a tongue muffler with 4 rows of 3/32" holes in it. Uniflow tank on suction only, no muffler pressure. Tried a commercial tube muffler and engine didn't want to settle down, my guess for what its worth is the motor likes a little back pressure, I think the extra Castor oil helps too.