Re: upgrading to 2 -115 hp from 1-225.
wahoo51 wrote: <br /> I have a 24' proline w/a <br /><br />Is it similar to Proline 24' "Bay" that can bee seen on Proline website?<br /><br /> with a 225 yamaha (2 stroke)on single bracket.<br /><br />What year and what weight for the 225 hp Yamaha? What is Your normal cruise speed/RPM and fuel consumption then? Top speed/RPM and fuel consumption? <br /><br /> I would like to upgrade to 2-115s. <br /><br />As an earlier poster mentioned - is it 2- or 4-stoke outboards You intend to use? If You are thinking of Yamaha F115 4-stroke, I have ONE of this outboard and it is fine and proven outboard. In same weight class is for example Suzuki DF115 and DF140 (even lighter that DF115). Two Suzuki DF140 would be possible I guess, if Your boat can handle 280 hp total. DF 140 is not that much more expensive than for example Yamaha F115.<br /><br /> That means I will have to replace the bracket as well. <br /><br />Was Your boat equipped from factory with the bracket or did You mount it later?<br /><br /> How will the additional weight affect the whole configuration of the boat ? <br /><br />- Maybe a little "tail-heavy" when boat is at rest.<br />- Maybe little harder to get up on plane.<br />- Maybe little difficult to stear straight at low speed (many boats behave like that when more weight is added rear in the boat, my boat for example).<br />- More stress on stern. Is this boat certified for the weight of two 115 hp outboards? For example two F115 (2 x 400 lbs=) 800 lbs?<br /><br /> The weight of one of these 115s are nearly the same as the 225 that the manufacters made it with. <br /><br />You probably also need to check with your boat insurance company if they will insure Your boat with twin 115 hp considering the added weight on stern.<br /><br /> What of the fuel consumption ? <br /><br />What is your present fuel consumption (liter/nautical mile or similar) at cruise and max RPM?<br /><br />For a singel Yamaha F115 4-stroke you can read on Internet, on Yamaha US website, for diffrent boats. For twin F115 - I do not know. You can also read about Yamaha F225 fuel consumption with various boats on Yamaha US website if you are interested.<br /><br /> Should I install a kicker instead ? <br /><br />I guess it depends how You use Your boat and what YOUR main purpose of two 115 hp outboards.<br />Main purpose could be security, if one of the outboards fail you hopefully can get home on the other outboard. You could perhaps have almost same sequrity with a singel 200-225 hp (2- or 4-stroke) and an extra smaller outboard like 25 hp or similar (2- or 4-stroke). There is equipement so you can have the smaller outboard be steared from main outboard steering (like EZ Steer).<br />Others may also think it is "cool" to have two 115 hp outboards and I see nothing wrong with that.<br /><br />Cost: I do not know if a new singel 225 Hp (for example Yamaha F225) and for exampel a new Yamaha F25 4-stroke will be cheaper both to buy and to service than for example two Yamaha F115.<br /><br /> I would like to hear from the experts before I go messing up. <br /><br />I'm no expert but I hope I helped some. I have myself a singel Yamaha F115 4-stroke (on a 19 ft bowrider boat) that I'm happy with.
