Hi guys, are the mercury 115"s any good. The 91 model with 2+2 carbs. I was trying to get some info on these motors. This engine needs basic maintenance, like carbs cleaned,water pump,plugs,stuff like that. Also i might be intersted in stepping up to a bigger engine like 175-200. Will there be enough difference in performance to justify the extra money? The engine will go on a 18 foot wellcraft cc fish boat. any help will be appreciated.