hhmmmm, yes, try the 12x6 APC,thats what used on my irvine 53.

u dont need (although id recomend it) a reamer for the prop, all i did with my west and its 13x4APC was put the prop on, then tighten it up, seems fine for me, although i wouldnt really recomend it, when you need to take the prop off, just pull the carb out, then wedge a tooth brush in the fuel inlet slot on the cranckshaft, give it a good heave then you can take it off. ive taken the prop off enough times now, and its like it been reamed as tis easy to take on and off but there the engine is very smooth, and no abnormal vibration associated with un balenced props


Ian