I still have a new IB marine engine and I just checked the P/S. Mine came with pipe timed just like the ducted fan version. I think the O/B came standard with the non pipe timed P/S.Replace the piston/sleeves with ducted fan pipe timed P/S, head clearance .010-.012, reduce bowl volume (Keeley head), etc. I always liked the Irwin tuned pipes for K&B engines. Really wakes them up. You could also buy a Novarossi 46 DD, and it will scream right out of the box.....
This happens to all enginesI was told that some problems with K&B is some mods made to them by engine hackers trying to out engineer the designer.
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