Dinghy outboard motors

Caring for your carburetor (Part 2)

Proper maintenance of the fuel feed system can help prevent breakdowns. In this second feature on outboard motor maintenance, we’ll be taking a closer look at the traditional maintenance operations, as well as what to do in the event of mechanical failure.

A dinghy’s fuel system is probably more vulnerable than it looks: the remote tank, and the fuel line and connectors are at risk from external knocks and bangs or sudden movements. Two good basic practices: secure the tank and always close the breather.

Has your outboard stalled? It could be the carburetor that’s clogged!

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Published 29/09/2023

By Olivier Barret

Subscribers Only

Issue: 192

Published: nov. / dec. 2023

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In the first part of this series (See MW190), we saw how to carry out the basic overhaul of an outboard motor, starting with flushing the cooling system to prevent rust from invading the block. We then turned our attention to replacing the engine oil and gearbox oil to ensure proper lubrication. The fuel system is another essential element in the smooth operation of an outboard motor, and must be regularly maintained to prevent breakdowns which, by definition, never happen at the right time. Shifting the tank around in the dinghy and exposing it to the elements - not to mention poor-quality fuel - are conducive to the proliferation of dirt and bacteria, which can clog the carburetor. It’s always a good idea to carry a jerry can or a spare tank with clean fuel. In this respect, it’s important to store spare gasoline in fully-filled jerrycans and/or containers, as trapped air is likely to lead to condensation and thus pollute the gas. After two months’ storage, this fuel should be used up and replaced, as it ages very badly. This chapter deserves a brief aside concerning the fuel itself: even if outboard manufacturers don’t give precise specifications on this subject, always opt for fossil fuels and not biofuels.
In addition to all these precautions, we strongly recommend that you dismantle the carburetor once a year for proper maintenance. Outboards can easily stall due to a clogged carb. Having a carburetor maintenance and repair kit on board, including replacement gaskets and jets, will mean you can get back under way as quickly as possible.

Philippe Bauer, from Tendance Voile, dismantled the carburetor on this 8HP Yamaha to give it a good clean and change the gaskets and seals. His advice is to take photos during disassembly and be tidy when removing components. We start by draining the bowl after having emptied the fuel lines.