ORIGINAL: desertpig
ORIGINAL: coony2787
Mix up some 32:1 oil and gas preferably lawnboy ashless. Then mount motor on plane, and go fly. That is the best way to break it in. The needle setting shouldnt even need to be turned. Make sure they are both set at one and half turn out. And your ready. Run about 2 to 5 gals of gas threw it at 32:1 in the air.
Chad
It never ceases to amaze me how anyone can recommend using the factory needle settings out of the box without any adjustment. We then wonder why engines run like crap, dead stick or why manufacturers don't replace burned up engines when they run too lean.
Not bashing anyone, I am only stating as a tuner - I never use the settings out of the box because very rarely are they even close to being close! Altitude, temperature, humidity and even transit effect the mixture requirements of these engines. If you don't have the experience, seek out those who do so you get the setup right ... if you choose to ignore this advise you could be making a costly mistake.
So .. to recap - 32:1 Ryobi, Lawnboy or Bel-Ray S2 oil for at least 3 gallons - adjust mixture at all throttle ranges with more emphasis on low and midrange during break in. Fly with the right prop avoiding WOT. NO HOVERING either!! The engine is going to run hot for a gallon or two anyway, so you want as little load and as much air as you can get. Hovering creates a big load and kills airflow!
I put my new engines in, start them and lean out the low needle to the point just where it hesitates on transition to abrupt WOT.. when it does that, I richen the low needle one screwdriver blade thickness at a time until the hesitation disappears. I then give a brief blast of WOT to verify top end is a little "muddy" meaning rich. Idle and midrange should be excellent (done with low needle) and high end is OK to be a little burbly or rich. After a few flights start leaning out the high needle a little at a time. When you adjust high low usually needs to move too to keep midrange intact.
Its a bit of a chore, but once done.. you rarely have to touch these engines!
Once broken in (about 3 gallons) switch to BelRay H1R full synthetic at 50:1 for best performance and power.
When you change oils you will probably have to adjust needle settings..
Despite what you read - don't ever use 100:1 oil mixes in these engines! BAD BAD BAD!!
DP