Re: Transom plate dimensions
There are four holes, two at top, two at bottom.
Most brands use 1/2" diameter fine thread SS bolts with brass locknuts, but I have seen some Yamaha's mounted with smaller diameter bolts, so check on the diameter your engine requires. Dimensions given are bolt CENTERS. You should always draw the transom top and vertical centerline on your template.
From the top of the transom, both top holes are 1-7/8" down, and the bottom holes are and ADDITIONAL 8" down.
Top holes are a total of 12-7/8" apart, or 6-7/16" from transom centerline.
Bottom holes are a total of 9-7/8" apart, or 4-15/16" from transom centerline.
This is the universal bolt hole pattern, and applies to all brands of engines (assuming they adopted it), at least 1984 and later, from about 30HP on up to 250HP. None of this applies to OMC's blind hole option, which other brands did not use.
I copped this from another thread. I verified it with the template shipped with my XR4. I scanned the template, but the scans cannot be reduced small enough to post here.
I recommend you make the drill guide out of 2 inch dimension lumber, drilling the holes with a drill press so they are vertical. They need to be pretty close to perpendicular to the transom.
hope it helps
John
