Reply To: Converting Yamaha 6hp 677 model to 8 hp

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July 6, 2021 at 5:20 am #242052
Gore194
Participant

    With 6 hp carb+ 6 hp red valve/ 8hp carburetor+8 hp red valve in the same conditions: 95 kg (my weight) , same propeller, same boat, I reached same speed (around 25 km/hour)
    6hp carburetor main jet :76
    8hp carburetor main jet: 78
    as I wrote above ,it is dificult to find more information about this outboard