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Yamaha outboards, Year 2000, 250 HP, Model: ox66. Yamaha
They Start immediately. Rough idle, and they wont come up to 5000 rpm. All cylinders have good compression. All cylinders appear to be firing. I removed all the fuel injectors and tested each one individually.... all appear good. Fuel pressure appears to be in line with the spec suggested. they are fed through RACOR fuel filters.... no water in the fuel. There are two of these engines on the outboard bracket. Both act exactly the same. Each engine comes from different parts of the country. The built in oil injection system is working... no possible adjustments here.… read more
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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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