Boat Engine Parts

From the propeller up to the carburettor:

four groups of parts sell differently, because each fails differently. A propeller is chosen by diameter, pitch, rotation and the spline of the shaft it slides onto, in aluminium or stainless steel. A lower unit, the gearcase that hangs below the waterline and carries the propeller shaft, usually comes whole off a motor that was stripped for spares, and it is the fastest fix after a strike on a rock or a sandbar. Ignition parts such as CDI units, coils, stators and rectifiers are sealed electronics you cannot judge by looking at them. Fuel parts run from carburettors and their rebuild kits to fuel pumps and water-separating filters. The impellers, anodes and oils that get replaced on a schedule sit under boat maintenance, and complete motors under outboard engines.

Yamaha part numbers on Hidea motors:

fit comes from the engine’s model code and serial number, not its horsepower, and a carburetted two-stroke shares almost nothing with a fuel-injected four-stroke of the same size. The Hidea two-strokes sold new in Panama are built largely on older Yamaha designs, so many of their parts carry Yamaha numbers, and a lot of aftermarket stock is labelled to fit Yamaha, Hidea and Parsun at once. That widens the search, but check the number stamped on the part itself before assuming a match. Then choose between genuine and aftermarket. A copy propeller or carburettor kit can serve a working skiff well enough. For a CDI unit or a gear set, the genuine part usually earns the difference, because an aftermarket one that quits offshore costs far more than it saved.

Propeller metal, and the price of a spare already in Panama:

aluminium, for a mid-size outboard, runs around $120 to $200 new, while stainless starts near $400 and goes past $700 for the bigger engines. A used stainless prop keeps much of its value because a propeller shop can straighten, weld and re-pitch it; a bent aluminium one is rarely worth the repair. Time moves prices too. A part ordered from abroad can leave a fishing boat ashore for days, so the correct spare already in the country often fetches close to its new price.

A lower unit or CDI off a stripped motor:

start by asking why the engine was taken apart. A motor that sank or swallowed salt water leaves its carburettor and electrics suspect even when they look clean, while one parted out after a broken powerhead may have a perfectly good lower unit. On the gearcase, turn the propeller shaft by hand and run it through forward, neutral and reverse; it should click into each gear without grinding. Look at the skeg for weld repairs or a ground-down tip, check the drive shaft splines for twist, and pull away anything wrapped behind the propeller, since fishing line wound there cuts the shaft seal and lets water into the gears. Electrical parts are the gamble. Unless the seller can show one working on a running engine, or measured with a meter against the service manual, price it as untested. On a carburettor, white powder in the float bowl and chewed screw heads point to salt and earlier rebuilds.

Listing a gearcase, an ignition part or a box of carb kits:

put the brand, the model code and the year or serial range of the motor it came off in the title, photograph the stamped part number, and say plainly whether it is genuine or aftermarket. For a lower unit give the shaft length and whether the gears shift cleanly; for electrics say how and when it was tested, or that it was not. If the part came off a motor that went underwater, say so. A crew from Aguadulce with an outboard down will usually want to meet near the landing and bolt the part on before paying, so tell them up front whether that can happen.