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  Is motor set-up properly?

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Author Topic:   Is motor set-up properly?
Sinclair7 posted 09-23-2001 12:41 AM ET (US)   Profile for Sinclair7   Send Email to Sinclair7  
My 13 is currently powered by a 25 Tohatsu. This is the motor that was with the boat when I bought it. The boat seems to run smoothly on plane but I am not sure if it is trimmed properly. This engine seems tall compared to other engines so I assume it is a "long shaft." One advantage of a small boat seems to be the capability of getting into shallow water but the engine hits first. Is there any way to lift the engine and how can I be sure it is trimmed properly?
kingfish posted 09-23-2001 08:12 AM ET (US)     Profile for kingfish  Send Email to kingfish     
Your engine will *always* hit first, proper trim or not. If it weren't in a position to do so, it wouldn't be able to to what it is supposed to do, make your boat move.

With your boat on the trailer or on a lift and the motor down in the running position (but not running), take a short straight-edge of some sort and hold it up against the bottom of your boat right in the middle, so the straight-edge is pointing fore and aft. Slide the straight-edge aft to come in contact with the front of the lower unit of your motor, still holding the straight-edge up against the bottom of the boat, so you are extending the line of the lowest part (keel) of the bottom back to the lower unit. The cavitation plate on your motor's lower unit (the first horizontal plate above the propeller) should not be below this line and transom-mounted motors are sometimes set up to 1-1/2 inches or so above this line for higher performance. I'd stick to setting the motor so the cavitation plate is even with the keel or just a smidgeon above until you are used to moving things around and are able to tell whether any higher setting is necessary.


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