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    Fuel Flow

    I am having a problem with my fuel primer flattening out at high RPM (over 4000.) this is on a 100HP Johnson (1979) The engine runs good and I have no other problems. could it be the fuel filter. The tank is well vented. I have a spin on seperator/filter
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    Fuel Line air locking

    I am having a problem with my fuel line air locking above 4200RPM. I have replaced the bulb, dressed up and used new clamps on all connections. I run with an installed fuel tank. When it happens the bulb is almost flat.<br /><br />Any suggestions on what to check next?
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    cupped vs uncupped prop

    I am trying to find out what the difference is between a cupped and uncupped prop. Some said that it adds and inch to the pitch. another said it was designed for the trim systems.
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    Prop sizing

    I know that the subject of what prop for speed, power, etc. But I would like to know the effect on the engine. I have a 100HP Johnson (1979) that runs very good. The prop that came with it is 13.75" X 15" pitch. I don't like running WOT but it will reach 5500-5800 RPM. and I am getting...
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    Vibration / Shuttering

    I have been having a contiunious problem with shuttering / Vibration. I am running a 21 Foot CC with a Johnson 100HP (1979).<br />Anyway, between 1900 and 2100 RPM the entire boat shutters. Above and below this, she runs fine. Any suggestions? :confused:
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