Hi John, mine started out with the same, an Irvine 46 with the black carb (lovely engine!). Also, as a bonus, the engine colour matched the trim perfectly! But, recently a bearing needed changing, not a problem but i'd bought a new O.S. 55 for another plane and my lack of patience got the better of me so in it went. Goes really well, a little too well at times, i think i may have reached VNE for some of the trim...great stuff!!