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TOPIC: 1968 Mercury 500

1968 Mercury 500 3 months 1 week ago #140241

Good afternoon,
I have a 1968 mercury 500 serial number 2408927 with a couple questions. First this myself a very little weight in the boat the motor tops out at 4200 RPM at around 20 MPH. the motor is on a 1968 Star craft Polaris 16 foot runabout. Everything i have read says the motor should run at WOT 5500-5700 is this correct? It seems the timing is fine and all four cylinders are firing. Compression on all four is between 135-138 pounds. Could it be the throttle cable needs adjusted? I did notice the lower unit prop shaft has a very slight bend to it but is not severe.
Any help is appreciated.
Thank you Nick

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1968 Mercury 500 3 months 1 week ago #140243

make sure the butterflies are full open. what pitch prop are you using? boat could be water logged. I would think the prop would be about 19 in pitch. and YES 5600 5800 is best. 1 914 310 7086

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1968 Mercury 500 3 months 6 days ago #140253

made a mistake on the pitch I would think 10-11 in pitch not 19 that was a misprint

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