1975 Bertram 31
$119,900
Boat in Newburyport, MA 01950 US
Built in 1975
31
2 Engines (2x Yanmar)
31 feet
Diesel
Fiberglass/Reinforced
This 1975 classic was repowered with 2000 twin Yanmar 6LP-STE 300 hp engines each with just over 3200 hrs, has a Next Gen diesel generator recently rebuilt in 2022 with zero hours, an inverter, and has oversized stainless steel rudders. The flybridge with helmstation (& cover), tuna tower, deck mounted tuna chair, rod holders, extra spacious cockpit, and harpoon pulpit offer plenty of visibility, room, and storage, for the discerning angler. LITTLE EVA is equipped with a Ritchie compass, VHF,radar, Raytheon & North Star GPS's, Simrad APII autopilot, and Furuno depth/fish finder. Accommodations include a cuddy cabin with V-berth that sleeps 2, a Galley with a Nova Kool fridge, 2-burner electric cooktop, Heat/AC, interior/exterior lighting, and an electric head. She has been professionally maintained and has had several upgrades. LITTLE EVA will launch in June and will be ready to get you on the fish ASAP!
Don't miss out! Call today to schedule a showing.
Epirb & Commercial Flare Kit
Commercial offshore life jackets
Hailer
Oversized stainless rudders and rudder bar
New shaft logs and flax packing in the rudder boxes (2023)
Custom boat alarm w motion detector
Water and waste tanks sanded and coated w/Tuff Stuff marine epoxy primer (2023)
New flybridge canvas
Custom gel coat throughout
Raw water pump, alternator, starter, and cables for the harpoon pulpit
6 new deep cycle series 27 batteries (2023)
Many spare parts
Price History
| Date | Event | Price |
|---|---|---|
| 5/2/24 | Initial price | $119,900 |
1975 Bertram 31 Video Tours
Boattest.com Review
Overview
This review examines the impact of repowering a 1981 Bertram yacht with modern Yanmar 6LP series diesel engines. Originally equipped with two 330 horsepower Mercruiser 454 gasoline engines, the vessel underwent an upgrade to twin Yanmar 6LPA STP II diesel engines. This transition not only improved efficiency and operational security but also added value by reducing weight and fuel consumption while freeing up valuable engine room space.
Engine Design and Installation
The Yanmar 6LPA STP diesel engine features a compact design that fits easily within the existing engine stringers of the Bertram, creating an additional 3 inches of space on the inboard side and sufficient room on the outboard side to accommodate a small generator. The aft end of the engine also gained 5 inches of clearance. Despite its compact profile, the engine maintains accessibility to key maintenance points, including oil dipsticks on both sides, a spin-on oil filter, a secondary fuel water separator filter, and a primer pump located on the inboard side. The heat exchanger is positioned high on top with hoses routed around the front, while the stainless steel mixing elbow, wet turbocharger, compressor, and air intake are arranged efficiently at the aft end. The transmission cooler and hoses are located below these components. This layout significantly improves space utilization compared to the original large-block gasoline engines, allowing easier access to batteries and additional equipment placement.
Engine Specifications and Performance
The 6LPA STP is a 6-cylinder, 4-stroke, 4.1-liter turbocharged diesel engine equipped with an intercooler and a fresh water cooling system, which is considered optimal for marine applications. It delivers a continuous rating of 255 horsepower at 3600 RPM and a maximum output of 315 horsepower at 3800 RPM, weighing 899 pounds. The repowered Bertram achieved planing in 5.3 seconds and reached 30 mph in 8.4 seconds. At maximum RPM (3911), the engines consumed 29.4 gallons per hour, providing a range of 254 miles at 37.4 mph. Operating closer to the continuous rating at 3500 RPM, fuel consumption dropped to 23.3 gallons per hour, extending the range to 292 miles at 34 mph. The most economical cruise speed was 20.1 mph at 2250 RPM, yielding a range of 401 miles. These figures highlight the improved fuel efficiency and extended cruising capabilities afforded by the diesel repower.
Operational Benefits and Owner Experience
The repower delivered significant benefits including reduced engine weight, increased available space, and easier maintenance access, all contributing to safer and more economical operation. The owner noted that the only unexpected cost was repainting the waterline due to an overall weight reduction of approximately 3,000 pounds from the new engine installation. The diesel engines provide peace of mind through reliable and efficient performance, promising many years of enjoyable boating. The reviewer also emphasizes the advanced engineering of Yanmar's latest diesel models and recommends considering Yanmar power for both repowers and new yacht specifications.
Overview from around the web 1975 Bertram 31
Customers consistently praise the 1975 Bertram 31 for its classic design and solid construction
Many highlight its sturdy hull and reliable performance, making it a favorite among anglers and cruising enthusiasts alike. The spacious cockpit and comfortable interior receive positive remarks for accommodating both fishing gear and overnight stays. Owners also appreciate the boat's timeless style and ease of handling, noting that it remains a dependable and enjoyable vessel even decades after its production. Overall, the 1975 Bertram 31 is celebrated for blending durability, functionality, and classic aesthetics.
The Biggest Pros and Cons
The 1975 Bertram 31 is a classic sportfishing boat known for its timeless design and robust construction. Here are some of the pros and cons of this model:
Pros
Durable Build: The Bertram 31 features a solid fiberglass hull with a deep-V design, providing excellent stability and a smooth ride even in rough seas.
Classic Styling: Its iconic lines and traditional profile make it a favorite among enthusiasts who appreciate vintage sportfishing aesthetics.
Spacious Cockpit: The boat offers a roomy cockpit ideal for fishing activities, with plenty of space for gear and anglers.
Reliable Performance: Equipped originally with strong inboard engines, it delivers dependable power and good cruising speeds.
Comfortable Cabin: Though compact, the cabin includes essential amenities for overnight trips, making it suitable for short cruises.
Cons
Aging Systems: Being a vintage model, many boats may require updates or maintenance on electrical, plumbing, and mechanical systems.
Limited Modern Amenities: Compared to newer boats, the 1975 Bertram 31 may lack some contemporary conveniences and technology.
Fuel Efficiency: Older engine designs may not be as fuel-efficient as modern counterparts, potentially leading to higher operating costs.
Weight: The sturdy construction results in a heavier boat, which can affect speed and handling compared to lighter sportfishing models.
Maintenance: As with any classic boat, ongoing upkeep is necessary to preserve its condition and performance.
Made For
The 1975 Bertram 31 is ideal for boating enthusiasts who appreciate classic design combined with rugged performance. It’s perfect for anglers seeking a reliable offshore fishing platform, as well as families and cruisers looking for a sturdy and spacious vessel for coastal adventures. With its timeless style and durable construction, this boat appeals to those who value both functionality and vintage charm on the water.
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Boats For Sale in Massachusetts, United States Similar to the 1975 Bertram 31
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 1975 Bertram 31 | |||||
|---|---|---|---|---|---|
| $119,900 | $99,999 | $149,900 | $79,900 | $59,900 | $57,500 |
| Newburyport | Newburyport | Rockport | South Dartmouth | Amesbury | Braintree |
| - | 44' | 32' | 28' | 35' | 33' |
| Yanmar | - | Cummins | Yamaha | Crusader | Mercury |
| 300 hp | 550 hp | 425 hp | 225 hp | 250 hp | 350 hp |
| 748 | 95 | 401 | 36 | 475 | 5 |
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Meet the Broker
Address
Other Information about Merri-Mar Yacht Basin
Family-owned and operated for 68 years, Merri-Mar Yacht Basin is a full-service, year-round marina, located on the Merrimack River in historic Newburyport MA. We offer seasonal and transient moorings & dockage, free WIFI & parking, storage, a Service Department, a Parts Department, a Ship's Store, and a Yacht Brokerage for pre-owned power & sail vessels.
Contact Merri-Mar Yacht Basin about 1975 Bertram 31
364 Merrimac Street, Newburyport, MA, 01950
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