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I did that several years ago, i which i had the patiences or the time to do it, i made a adaptor here are some pictures , i posted the complete build in smokestak , the good all days,,
I almost certainly will sell the bell/adapter and most probably the gen head, too. I just can't see wasting a 10HP Yanmar on a 3kW head. I've had a few 5HP Yanmars but I haven't found any used 7HPs, yet. The 7HP is good for a 016A or 016B or 701, IMHO.I did a few like that with dual bearing and a coupler work good especially that i belive the shaft on that yanmar is 1", if in diameter, if you deside to sale the bell housing flywheel and adaptor i would be intrested,