I usually run at least the first tank, 1 tank idling on a car stand (wheel off ground). I use hotter plug #5 for run-in. After that either one more tank idling or on road 1/2 throttle rich, tons of smoke then stop half tank.let it cool. start and let it hot reach 100deg, cool back...cool, hot,cool, hot. all the while the while leaning a bit by bit...until 1 litre, i think. well, thats me. Now my engine is still in good shape...my NovaMax P5. Now using #6Tf plug.