Hey guys, I bought a old 30 horse yammi a few weeks back, ran nicely for my first trip on my Classic Gheenoe, but now its starting to show symptoms of a cylinder not firing. Bringing it to my local shop next week, but in the mean time - I have absolutely no idea what size prop is on this thing. Its a nice 3 blade stainless, but havent been able to find any size specs on it. Id like to get a spare prop for it, but also wouldnt mind making that "spare" a potential performance improvement. I got a tiny tach that ill install as well, but even at that, how do I decide what pitch to go with for the spare? I feel like I see the 13p talked about most often with these engines, but that could also mean next to nothing.