Re: Yamaha engine mount bolt layout
The bolt holes for all major OB motors 88 hp & higher, post 1987 is a BIA standard. Most of the mfg were using the standard before that, except Mercury/Mariner and Nissan/Tohatsu on their 90 - 140 hp models. But even those two got on board after 1987.
BTW, the standard adopted was the EverRude V6 pattern used from the late 70's on.
You can probably borrow a metal drilling template from a local dealer to drill the holes, makes it much easier.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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