Got a new TT 91 FS. Anybody know if it makes any difference which way the prop nut and lock nut should be oriented ? Which one should be placed against the prop washer? My Saitos and OS
fourstrokes have the larger nut up against the prop washer and the thinner lock nut on last. The TT 91 shows the smaller or thinner nut on first up against the prop washer and then a larger nut on last....????

The cone shaped nut, which probably has a thin hex disc, goes against the prop. The locking nut is one which goes over the outside of the prop nut. The locking nut looks bigger but if you look inside you will see it has very few turns of thread, most of it is smooth, to go over the cone of the prop nut. The cone shaped nut may seem less, but look inside and you will see it is threaded all the way, it is the true prop nut.

Harry

Thanks Harry for the very fine and detailed explanation.