i keep mine in netural, this way the transmission is not turning- no wear-no problum-
I am not so sure, as far as I know it is the other way around. The transmission
is turning when in neutral because it is powered by propeller (we are talking fixed props here). When you put reverse gear in, it stops turning, because there is not enough power generated by propeller to turn the engine
. If you do not believe, you can listen to your transmission while sailing.
Yanmar SD40 manual says re-lap cone every 100 hours, replace every 500h. (BTW, lapping instructions were added to revision 2 of the manual and are not in original documentation
that came with my saildrives,) Takes me about 1.5 hour, most of which is spent lowering oil
level/refiling and washing
gears to remove all traces of lapping compound after lapping. Very important!
Still, cones are ridiculously expensive, as there are at least 3 vultures (=dealers) between customer and manufacturer adding their own markup. At least that's the best I was able to find.