Yeah I checked. The Yamaha bolt pattern looks standard, but the Merc looks like it might be the older pattern...I heard there was a period from late 70's to sometime in the 80's that the bolt pattern was different. Maybe the lower unit is older than I was told?
The bolt patterns look like this (roughly):
o = yamaha
o = merc
oo-------oo
-o-------o-
-o-------o-
Thanks,
David
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