John, I agree that the tight radius bend in the cable might be a problem. I can think of a couple of options:
1. When I bought my boat it had the teleflex cable setup, but back then the tilt tube on OMC motors was in the plane of the transom, so you couldn't attach the cable to the tilt tube unless you had a very wide transom cutout, which I didn't have. (The tilt tube on Mercs was forward of transom like on the BRP motor you bought; the little recess behind port seat was made to accommodate the drag link that extends over there in full right rudder position.) On my boat the cable attached to an aluminum tube with a big plastic ball on it on an under-seat bracket that was mounted to the transom, so the tube could move in a big arc as the motor tilted up and down. Of course this required a fairly large hole in the side of the splashwell that was just barely covered by a flexible boot.
2. A more elegant solution would be to set it up like I did when I rigged up the Hynautic system pictured below on mine. (The current SeaStar system was not available in the late 70's when I did this.) Hynautic had a system where the hydraulic cylinder screwed on to the tilt tube on the motor, so I bought that system, but attached it to the aluminum tube from the teleflex system, and then made a bracket from some 1/4" aluminum angle that attached to the stbd upper motor mount bolt and had the tube welded to the bracket. I wasn't comfortable with all the steering loads going thru that bracket, so I sent the cylinder off to Hynautic and had them install the mount on the other end of the cylinder like they used on inboards so I could attach the cylinder to the transom. The hydraulic cylinder was mounted under the stbd seat, and it was easy to seal the aluminum tube where it came thru the side of the splashwell since it didn't move. I then fabricated a short drag link to connect the end of the hydraulic ram to the tiller arm on the motor. If you could find one of those aluminum tubes, which is the same length as the tilt tube on the motor, you could set up a similar system, but just use the cable instead of the hydraulic cylinder. If you weren't comfortable with a single bracket carrying all the load, you could fabricate a second bracket that also tied the aluminum tube to the port side upper mount bolt. Although it was an unbalanced cylinder and harder to turn to port than stbd, the hydraulic cylinder and seals were not exposed to salt like the SeaStar system and it worked perfectly for 28 years until I finally repowered and switched to the SeaStar system. Unlike the new system, which only turns the motor through about 75% of it's available travel, my home-made system used 100% of the available travel, which I suspect the cable systems also do.
3. A third option would be to check with all the outfits that make cable steering systems to see if they already offer similar brackets that mount the cable to the transom instead of to the motor.
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