Another Jack Plate Question

[tecoon]

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