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  1. M

    1989 Mercury XR4 Black Max 150 Upgrade Capabilities

    I know this is quite a few years old...I have the same small gearcase and am having problems finding a prop to fit it. Were you able to find one you liked? My question doesn't involve diameter / pitch so much just literally to fit the gearcase? Thanks
  2. M

    XR4 Blackmax 150 - can't find a prop to fit

    I wondered that also - Thinking I have a 4 1/4 gearcase. Not sure how to verify that?
  3. M

    XR4 Blackmax 150 - can't find a prop to fit

    I am thinking a 19 pitch...my dealer got me one and it is too long. I would really like to know what year lower unit I have. Thanks for the reply.
  4. M

    XR4 Blackmax 150 - can't find a prop to fit

    Hello all - I believe i have a small gear case lower unit on my Xr4 150. I need to find a prop to fit it. The prop I have on now has been modified to fit. My assumption is I need a 4.25 hub and the prop on now was ground down to clear the housing. Any help would be greatly appreciated. My engine...
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