[BrandX]

this would explain a little about my combo as well. With the 56cc head and flat top o deck 455 i was running 38 degrees of timing on motor with 112 premium sonoco fuel and a number 8 ngk. When i sprayed 225 to it i took out 10 degrees of timing but had a hint of detonation on the plugs. So i would probably fine with the 112 fuel and a colder plug if i set the motor timing at 30-32 and took ten out from there. Hmmmm....did i make any sense.