The most repeated causes of marine engine failure is a mixture of poor fuel and/or fuel delivery, usually caused by contaminated fuel. An overhaul of the carburettor intake system may be all that is required to bring the engine back up to full performance and, importantly, reliability.
The components you may require to refurbish the fuel intake assembly (checking our virtual schematic/parts list will help you get precisely what you need) can be found here at CMS.
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This component may have other applications within the Yamaha model range.