ORIGINAL: Steve Campbell
ORIGINAL: downunder
... set the mixture so it's running just barely above a 4 stroke setting for the first couple of tanks then slowly lean it out a little for the next few tanks.
Well, the above advice is dead wrong for an ABC engine.
As far as I know I'm the only one curious enough (or silly enough
) to actually take a brand new ABC and run it slobbering rich for 45 minutes then pull it to pieces to see how much damage was done. Absolutely none, the piston looked brand new with no signs of "squeezing" whatsoever and the pinch was the same as at the beginning. The following 20 minutes of running in using the "accepted" manner gave far more wear on all parts including the rod bush.
As for the advice I gave in the quote above, the mixture setting is exactly the same as in the instructions for my Irvine 40 (I just checked
).