Originally Posted by reinier
Buying a 25" and leave the transom as it is, isn't a serious option...
Correct - just lowering the CoG even further and creating looooaaaads of drag with the leg
Your transom is cut for a longshaft (20") motor. If a Yam F150 is too heavy, then look at lighter options. The rigging really won't be a problem to sort out. Instruments tend to be interchangeable and in any case, the GRP of your console is easier to patch up than rebuilding your transom to 25".
Got any pics?
I'm pretty sure JABS's transom will also be somewhere between 20"-21" This is not too tall for a longshaft motor.
Have you spoken to your engine supplier about set-up and rigging?