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Old 08-05-2017, 05:16 PM   #1
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Looking to buy Mainship 390, Single engine... Advise?

I'm currently in the market for a 1997-2005 model year Mainship 390. I want a single engine. Looking at Yanmars 300-380 hp. Any experience or advise would be appreciated before I pull the trigger..
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Old 08-05-2017, 05:24 PM   #2
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In a couple of years that's my retirement boat of choice. Stairway to awesome flybridge, lower helm with door, 2nd stateroom, single engine. Yanmar would be my first choice too, but I wouldn't pass on a Cat powered boat if the boat and deal were right.

I'll be paying attention

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Old 08-05-2017, 07:41 PM   #3
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I have a single screw Cummins 330hp in my '01 390. Great boat, no issue with the Commins 6bta
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Old 08-06-2017, 06:15 AM   #4
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I forgot they had Cummins too, 6BT great engine.




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I have a single screw Cummins 330hp in my '01 390. Great boat, no issue with the Commins 6bta
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Old 08-06-2017, 06:34 AM   #5
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Welcome to the forum! We love a 390 as well. The stairs are the big item for us as the ladder is hard for the grand kids, but they have many more nice features as well. Good luck with your hunt.
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Old 08-06-2017, 06:37 AM   #6
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How does the single perform for you?
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Old 08-09-2017, 02:40 PM   #7
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We have a '99 350. They were re-badged 390 in 2000. We have friends with an 390 as well. Minor differences. The guest stateroom is a double in the 350 and twins in the 390. The 350 has a weird 'desk' area beside the couch which we use as an end table.

We have a single Yanmar, which replaced the Cat 3116 that was there before.

I would suggest a bow thruster if you go with a single. I would love to add a stern thruster.
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Old 08-09-2017, 02:43 PM   #8
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I believe all the single engine 350/390's had a bow thruster standard




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I would suggest a bow thruster if you go with a single. .
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Old 08-09-2017, 11:06 PM   #9
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we have a 2003 390 with a single 370 Yanmar. Love the boat
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Old 08-10-2017, 06:12 PM   #10
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We used to charter a 2000-ish 390 with a single cat 3208 in the SF Bay Area and delta. A bow thruster is a must have IMO. We found the master stateroom extremely noisy due to wavelet slap, which drives me nuts. Ended up using the fold out couch in the salon, which we really liked for a number of reasons.. closer to the coffee, easier to do quick visual anchor watches, quiet, and so on. A good honest boat and we liked the overall design with nice sized aft deck and big flying bridge.

Chartered a 390 with twin Yanmars out of Oxnard once for a day trip to the channel islands... faster and handled better but way too tight an ER for me.
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Old 08-11-2017, 12:37 PM   #11
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Looking for Mainship

I tell you, it's not easy to find one that's been properly maintained. Everyone wants to defer the scheduled maintenance to the "New" prospective owner....
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Old 08-11-2017, 12:57 PM   #12
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Look for the Yanmar 6ly 370-ish hp or Cummins 6BTA 330 or 370. Avoid the 6LY2 420 or 440. Cat 3116 or 3126 ok, but not the preferred engine. Avoid twins on this boat. Make sure you can get to the critical parts of the gennie and that it is not all rusted up.
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Old 08-11-2017, 03:01 PM   #13
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It doesn't help that the gennie is in the bilge.... on most mainship 390's...
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Old 08-11-2017, 06:16 PM   #14
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why avoid twins ?
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Old 08-11-2017, 07:40 PM   #15
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why avoid twins ?
Too much of a cram fit. Can't get to some important engine bits.
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Old 08-11-2017, 09:43 PM   #16
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that makes sense...thanks
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Old 02-16-2018, 12:48 PM   #17
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Avoid the 6LY2 420 or 440.
I had eliminated the 390 from my search earlier because it was too slow, but recently heard about the 440s. Darn I was hoping those would give me the speed I want while still maintaining some engine room space. Just curious what the problems are with those engines?

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Old 02-16-2018, 01:53 PM   #18
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Originally Posted by BDofMSP View Post
I had eliminated the 390 from my search earlier because it was too slow, but recently heard about the 440s. Darn I was hoping those would give me the speed I want while still maintaining some engine room space. Just curious what the problems are with those engines?

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8-9 kts is not for everyone. The 'enjoy the journey' is a mindset. You'll appreciate it when you see how little you spend on fuel.
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Old 02-16-2018, 02:36 PM   #19
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Thanks and that will be a mindset that I fully enjoy - when I'm retired. I simply do not have that luxury today. I don't live on the water - I'm 4 hours without traffic - 5 on summer weekends - from the boat. My cruising grounds are isolated. "Nearby" destinations are 75 - 100 miles away. At 15 or 18 knots I can realistically travel somewhere and return (with safety margin) in a 3 day weekend. At 7 or 8 I simply can't.

They put the 440 in there so that people could do that. I was simply wondering what it is about that engine that would lead Ski to conclude that. I highly respect his opinion.
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Old 02-19-2018, 10:15 AM   #20
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Which is the most desired boat , the 39 ft or the 400 mainship?
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