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  1. #1
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    Black max xr2 rebuild help

    So i bought a bass boat at the end of last summer and was told it had a throttle problem. It will start up fine and idle but once I put throttle to her she boggs out and tries to die or will die once it gets past 1/4 throttle. I can choke it while I give it throttle and it will pick up and run great until I go back to idle then same thing unless I choke it again. Started to dig into it this winter and replaced/rebuilt fuel pump, fuel lines, bulb, filter, shortened fuel hose along with replaced them, new spark plugs and wires, drained fuel tank. I also cleaned the carbs and still have the same problem. Decided to dig into the carbs a little more and found that I am missing the Jet, vent bowl (#2 in the picture) that goes in between the two intakes. Can anyone help me decide what size I need. The options are .096 or .098. The other jets (#20 jet main, idle air bleed) says on it .060. Does it matter which size I go with or is there certain ones that go with the .060 jets?? Hopefully this will fix my problem. Any help is appreciated. My motor is a black max xr2 with serial number A139444
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  2. #2
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    Pekin, IL
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    Welcome to the site. Sounds like you have covered the fuel side on the motor. I would get me a portable fuel tank and hook that up to see if the issue is in the boat or the motor. Some tanks have anti-siphon valves and all tanks have vents. Either if these fail and you will have fuel starvation issues. Could laso have generated a pin hole in the pick-up. As far as the missing jet goes there are many carbs that run without vent jets from the factory.

    Rock
    Team Junk

    No sparkling wiggles in here, only dump truck grinches.

    "Screamin Heathen"

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  4. #3
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    Like rock said , almost all modded carb motors run without vent jets , I have all mine out , also most the 2.4s came without jets in 2 and 5 from mother merc, those mainly for mid range anyway, i went thru exact same issue on a mod vp motor , changed complete fuel system and lectrics , didnt fix it , what I came to find out is someone cut the heads on a low compression and raised it back up to 120ish , I put stock set heads on and had bout 70lbs , it was enuff comp to idle and run good on hose but put in water and was a dog ,

    With all that said if u hit choke and it picks up ,then need dig in carbs sum more , did u take the top plate off carbs and look at idle and off idle areas, has bunch very small holes that will get easily stopped up

  5. #4
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    stator, spark boxes, trigger. Old motors love new electrics
    Hydrostream dreamin

  6. #5
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    Just a thought, what elevation do you run your boat at and what pitch prop are you running.
    We had to run 2 pitches lower on our props when we went to Lake Powell in Utah
    Last edited by Baker343; 06-27-2019 at 10:42 PM.

  7. #6
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    Im pretty sure it's the factory prop. How can I check the pitch of the prop? Depending on which direction I drive I go from 3000 down at sand hallow, Utah to 8800 up at fish lake, Utah.

  8. #7
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    Quote Originally Posted by T3bbb View Post
    Im pretty sure it's the factory prop. How can I check the pitch of the prop? Depending on which direction I drive I go from 3000 down at sand hallow, Utah to 8800 up at fish lake, Utah.
    Your prop should be stamped on the side of the hub with a number with a P next to it. "19P" Don't know if you are running aluminum or stainless or a big and heavy or small and light fishing boat.
    I think a 19P stainless steel at a lower elevation would be in the ball park for running fishing hole to fishing hole.
    You may have to run a 17P depending on boat size and elevation.
    Find a good boat shop or Prop repair shop near you and ask them.

  9. #8
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    If it is a elevation issue a smaller prop is a quick fix. You may eventually have to re-jet for thinner air.
    Was your boat purchased up near you

  10. #9
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    It's on a 18 ft bass tracker. And yes I purchased it down the road from my house. Its had this problem since the guy I bought from owned it. I ended up going with the .060 jets because that's what was in it. I'll see what I can find out on the prop. Thanks for the help

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