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    Dissapointed in 9.9 4 stroke

    The two stroke was firing twice as often at a given RPM.
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    This doesn’t look right to me

    What is your engine serial number? All Mercury models are not the same.
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    Dissapointed in 9.9 4 stroke

    Although they have been out a while, a 9.9 EFI model does not readily compute. How low in HP will they go? The amount of gasoline injected at idle must be in the nanograms.
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    Dissapointed in 9.9 4 stroke

    I have seen vibration reducing pads that go between the motor's clamp bracket and the transom. Switching to a propeller with less pitch can help to slow down the minimum idle trolling speed. As can tilting the motor up somewhat to vector the thrust to a less efficient position. Piston engines...
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    Yamaha F70LA Tilt Not Working

    https://www.amazon.com/6CJ-43880-10-00-6CJ-43880-12-00-6CJ-43880-13-00-6CJ-43880-11-00-Replaces/dp/B0FVXDZ85C/ref=sr_1_1?crid=12SIMHD82VH5C&dib=eyJ2IjoiMSJ9.pBnDYolU4PWq8gUSoMUEAgiHKVp6KMB8zz7FCU_XR0p1hypIuGGZJ_DjW4znaoAjEg7Yi04aPSx2WFcYoIoLJqfz3LrAP-CdolPjBZe7PGsJ-dkjPlyprZx3DSEcXFCkawXL5jV20yKe...
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    Yamaha F70LA Tilt Not Working

    If the motor did not work why did you buy a relay?
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    Yamaha F70LA Tilt Not Working

    With the relay power wires disconnected from the relay connect those wires directly to the battery. Does the trim pump motor now work or not? Blue to positive and green to ground the motor will trim up. Green to positive and blue to negative the motor will trim down. Might be a brief spark...
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    Selva/Yamaha f60 efi spark issue

    Yamaha T60 EFI models use a engine control unit (ECU) assembly. No CDI assy. Stator is not in the loop with respect to ignition. The pulser coil tells the ECU when to terminate the ground to the ignition coil to cause it to discharge electrical power into the spark plug. Is the ECU receiving...
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    Question: 115 / 130 V4 yamaha 2 stroke carburator adjustments

    Not sure I am following you. If turning the screw outward provides more fuel while turning the screw inward provides less fuel, that equates to it being a fuel/air mixture screw. It varies the fuel/air mixture. But yes, the adjustment is made to achieve best idle characteristics. Fuel/air idle...
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    Dual battery or booster pack?

    No different than anything else that a motor maker specifies. Ok to use non OEM products "IF" they meet specifications. "IF" the Relion battery continues to meet Mercury's specifications then it "should" be OK.
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    Dual battery or booster pack?

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    Dual battery or booster pack?

    Negative. Mercury Marine approves the use of any lithium battery that meets the specifications set for in the service bulletin. A battery by Relion happens to meet the specification.
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    Dual battery or booster pack?

    Mercury Marine has issued a service bulletin that approves a number of their models for use with lithium starting/dual purpose batteries where the alternator of the motor does all of the charging. I suppose that on the basis that Mercury says it is OK, many Yamaha, Suzuki, Honda and Evinrude...
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    I got a Yamaha electric starter on eBay (new) but it doesn't show how to connect the electrical cables

    The OEM's will certainly agree with you as to that advice. If a guy does not need 100% quality, when 50% quality works for him, why spend the money?
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    Mercury F225 water leak?

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    I got a Yamaha electric starter on eBay (new) but it doesn't show how to connect the electrical cables

    Agreed. If we are talking about a lesser quality part. To me it depends upon the particular part(s) and its intended application. If a component of an electrical starting system fails on a motor that also has manual cranking capability (OP's configuration) that would not be the end of the...
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    I got a Yamaha electric starter on eBay (new) but it doesn't show how to connect the electrical cables

    $1049.00 from Yamaha or $166 from Ebay. Users get to make their own choice.
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    I got a Yamaha electric starter on eBay (new) but it doesn't show how to connect the electrical cables

    Don't know yet what the op's problem is.
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    Mercury F225 water leak?

    How many hours are on the motor?
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    Mercury F225 water leak?

    Remove the thermostat. Inspect the interior and exterior of the thermostat housing. Housing being an integral cast part of the block.
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