1978–1989 · designed by Al Mason · built by Pacific Asian Enterprises / Ta Shing Yacht Building
Heavy-displacement full-keel offshore cutter. One of the most credible single-hand Pacific liveaboard platforms in the 40-45 ft range — proven across every major ocean by solo cruisers. Designed for seakindly motion, deck-level shorthanded operation, and bluewater durability.
This is a general read on the Mason 43 class — informed
background, not a verdict on any individual boat. Condition, refit history,
and how a particular hull was sailed and stored matter far more than class
reputation. Use it to know what to look for; for a read on a specific
listing, run a free FairKeel report on that boat.
Heavily glassed hull-deck joint; reputation as a dry boat in heavy weather.
Cutter rig design supports progressive shortening — single-hand- able rig management in increasing wind without needing to leave the cockpit.
Strong owner community via Mason Yacht Owners group — institutional knowledge of class-specific issues is well-shared.
Known trade-offs
Below-WL access for through-hull replacement requires cabin sole or settee removal on most hulls. Drives up labor multiplier (1.5-2.0×) for any below-WL work.
Heavy displacement + small auxiliary engine on early hulls — the original Perkins 4-108 was undersized for Mason 43 displacement under power. Most cruising owners have repowered.
Interior teak joinery is dark and beautiful but absorbs moisture if not actively ventilated. Liveaboard-mode condensation is a real maintenance dimension.
Age-related quirks to expect
Original aluminum fuel tanks (early hulls)Medium1978-1985
Stress cracking at the keel-hull rounding by year 35-45 (NOT a keel stub — this hull has no fin-keel stub; the relevant zone is the deadwood-to-hull rounding on the full-keel hull)Mediumall (age-driven)
Teak deck (where fitted) reaching end-of-life by year 30-40Highhulls fitted with teak decks
Original 1979-era through-hull fittings now at 45+ years. Replacement cluster is non-trivial on a full-keel hull — cabin sole removal often required for access to the deeper bilge fittings.
Original wire + tangs typically due at 25-30 years. Chainplates on the Mason 43 are bolted through teak-clad bulkheads — leak paths around chainplates often hidden behind joinery. Mast is keel-stepped, so mast- step bilge water history matters.
Engine (original Perkins / Westerbeke vs. repower)priority: offshore, coastal, liveaboard
Factory and review material identify the Perkins 4-108 as the Mason 43 engine — many have been repowered with Beta Marine, Yanmar, or modern Westerbeke equivalents. A repowered hull is a significant value-add; an original engine at 45 years should be assumed near end-of-life unless service records prove otherwise.
How it fits your plans
Offshore
Designed for it. Heavy displacement (~20,000 lb), full-keel motion, cutter rig (progressive shortening — main+staysail in heavy weather) — proven Pacific platform for single-hand crossings.
Coastal
Overbuilt for coastal work but a forgiving platform. Slower than fin- keel boats of the same LOA; not a coastal racer.
Liveaboard
Generous storage and tank capacity. Below-WL access challenging for DIY maintenance.
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