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Hello, I have a 1993 Custom 17 Red dot whaler. I have been reading a lot of threads and it seems not too many talk about repowering with a Mercury 115 2 stroke. I have a friend that will sell me a 1998 Mercury 115 for a good deal. Currently I have a Evinrude 100xp with 84psi on all cylinders not sure of the year.... maybe late 80s, but getting on point to the Mercury: I have read about the 2 cylinders at idle and 4 cylinders @ WOT and I do not mind this feature. I have my battery, 13 gallon tank in the center console. Any body have input for running this 115 mercury on this boat, I think it is 350 lbs. Any thoughts positive or negative info for performance, mounting, etc. is appreciated. Thank you, Greg

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I run a Mercury 115 on my Montauk, and it is good power for the boat, which handles it well.
The boat should run close to 50 MPH. Although mine is the predecessor in-line 6, I would imagine the power is the same. These 4 cylinder Mercs have the 2 + 2 feature you mentioned, and switch to all four cylinders around 1800 RPM. You can feel the extra cylinders come on. As for weight they are only 30# heavier than the popular E-tec 90's, and weigh less than the v-4 E-tec 90 HO which is now also being installed because of more HP. A nice feature is not needing a separate oil tank. Mount the engine up 1-1/2", using the middle set of the five hole sets. Run a Mercury SpitfireX7 4 bladed SS prop or a Laser II.

The only thing I'm not crazy about with these 2 + 2's is the non-impressive 2 cylinder idle sound. I like the sound of all six idling on my classic "towers"! In the video, the Montauk engine has the blue decals.

https://www.instagram.com/p/BC-ad6NHs...stonwhaler

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So Finnegan who is pulling who in that video?

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Hello Finnegan, I just looked at pictures of your boat and it is flawless. It looks like you have a jack plate on it.... curious to know have you ran it with the plate and without with the 115? I see that you have most of the weight forward with the exception of the battery. My current situation is: bench seat in back with a backboard and cushions ( will post a picture later) two 6 gallon gas tanks under bench seat, a cooler seat @ helm (used for storage) and then under the console is 1 battery and 12 gallon fuel tank. I know this varies by the trip, but I feel like I will need all 24 gallons for this 1998 Mercury 115 ( cruising, WOT, tubing, etc...) . With all that being said.... you think a jack plate would work or shift the weight to much? any and all thoughts are appreciated. Thanks, Greg

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Take a look at oilcan73's personal page:
http://whalercentral.com/infusions/pe...r_id=16953
Oilcan73 has a 1999 Mercury 115 hp rigged to his 1963 Boston Whaler Custom 16.7 boat. While a 1963 16.7 hull is much lighter in weight than your 1993 Boston Whaler 17 commercial hull custom configuration, good overall performance is reported, up to the point the boat begins to chine-walk.