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Christiaan Bouhuys


In my experience  it takes more than two jet sizes down to go from a rich bog to a lean pop situation. A rich bog means you are a couple of jet sizes too rich from optimal, and from optimal to lean pop is probably another 1-2 jet sizes.  If the bog with the bigger main jet occurred when opening the throttle after it being closed for >1s,  you may be running to big of a pilot jet and should have gone down in pilot jet instead of main.  But best advice is always to look at the piston top, it should be able to tell you what the mixture (lean/good/rich) is on pilot (intake side) and main jet (exhaust side).