Dave,

I hope this info helps. I was reading my Feb 09 issue of Model Aviation and came across this article in the monthly Engine Shop column...this is on page 92. Read the part that starts in bold letters "My recent mention of starting problems with a couple of Magnum four strokers..." Hope it helps you along. I have seen a couple guys at my club field with the 70 and 91 Magnum four strokers have no problems starting and running theirs. Maybe the 120 is a different animal. Really hope this article helps ya! GOOD LUCK and good flying. Jon