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    Yamaha F90 no water at telltail

    My first guess would be a dirt dauber or other critter made a nest within the tell tale exit port. Start there. Try running some stiff heavy line up the tube to see if there is a restriction to flow.. One can hear most anything on the innerweb. Your F90 has carburetors. An air cooled...
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    What is this tube for on a Yamaha 60LB

    I suspect that you are talking about an F60LB. F for four stroke. 99Yam is spot on.
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    Alarm Sounds at full throttle

    Over temperature or low oil pressure will sound the alarm.
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    Yamaha cam roller part number?

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    Yamaha cam roller part number?

    Yes.
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    Sync, link timing on a 1986 90 hp (90AETL Euro)

    Is this to what you refer?
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    Sync, link timing on a 1986 90 hp (90AETL Euro)

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    Sync, link timing on a 1986 90 hp (90AETL Euro)

    SM shows -5* ATDC for idle timing and 22* BTDC for WOT timing. Plus or minus 1*.
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    Sync, link timing on a 1986 90 hp (90AETL Euro)

    Looks to be a circa 1986 model year motor. Similar to a US 90ETLJ except that this model has the Precision Blend System whereas yours is premix, according to you. LIT-18616-00-09 is the Service Manual for the USA model motor if that will help you.
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    1998 Yamaha F50 fuel enrichtment system how does it work?

    Some how I knew that was coming.
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    1998 Yamaha F50 fuel enrichtment system how does it work?

    Delete.
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    Sync, link timing on a 1986 90 hp (90AETL Euro)

    I am in the US. We don't have a your model over here. With the PID I can get to the US equivalent.
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    Sync, link timing on a 1986 90 hp (90AETL Euro)

    6H1 is the model prefix.
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    Sync, link timing on a 1986 90 hp (90AETL Euro)

    6H1 is the first part of the PID. Then an L or and X. Then some numbers.
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    Sync, link timing on a 1986 90 hp (90AETL Euro)

    What is the primary ID of the motor?
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    Fuel mixture WOT 1986 Yamaha 30 hp 2 stroke

    The idle mixture setting also has an affect on the amount of gasoline that it provided through the carburetor at WOT. Fuel level being too high can cause the carburetor to provide too much gasoline. Someone might have augered out the existing main mixture jet.
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    1998 Yamaha F50 fuel enrichtment system how does it work?

    Did you not read or understand post #6? In what country are you located?
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    2012 6 HP 4stroke Yamaha coil test specs

    Not understanding. What is a CID? What is a CID coil? What service manual do you have?
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    1998 Yamaha F50 fuel enrichtment system how does it work?

    Did you read the literature I sent you or did I just waste my time?
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    1998 Yamaha F50 fuel enrichtment system how does it work?

    Primestart is a Yamaha term for any automatic fuel enrichment system. They are not all the same. Primestart on an EFI F350 or the latest XF425 direct injection model is completely different than Primestart on two stroke models.
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