I need to repower my Oday 25 with an outboard motor. What shaft size sould I get?most outboards Im finding that are used are short 15" to 20" masde for fishing boatsor whatever. But only a few say long shaft. What about reliability should I go new or will a used motor be fine if its in good condition. I'm looking for a 6 to 10 HPfor my Oday 25. anyone care to help me out.