Honda 9.9
I have a 1999 Honda 9.9 on my M25. It runs like a top, is quiet, and has electric start and alternator to recharge the battery. It is very good on gas and plenty of power. I once used it to tow a 21' Cuddy cabin behind my boat when he lost power. It certainly wouldn't have won a race but it did move 46 feet of boat with six people aboard. All in all, I have been very impressed with this motor.