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  1. #1
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    Setup Input Please

    First of all, my new 2+2 is awesome! 250R, 1/2" above pad, manual Allison jack plate, 30" Promax. Hole shot is great, but the damn venting at break-over is really annoying. I ordered the exhaust sealing ring for the Promax prop, but have read mixed reviews about the performance and how it kills the hole shot for some people. Does anyone have any experiences or advice to share?

  2. BBC SPONSOR
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    Oct 2006
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    #2
    I dont think the ring will kill the 250R holeshot. We are running all holes plugged on everything, including the Max 5.

    There is a huge difference in the bottom end of the 250R and 250/300xs.
    Fastbass Marine LLC
    We specialize in NEW and USED ALLISON BOATS, Blazer Boats, Platinum Mercury Marine Repower Center, AquaTraction Flooring, and custom marine electronic installations on beautiful Kentucky and Barkley Lakes.

    2022 Allison XB-21 BasSport Pro Elite
    2022 Mercury 450R

    2012 Bullet 21ss
    2005 Mercury 300X

    https://youtu.be/FOnAGNWOgZ0

  3. Member
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    Dec 2015
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    159 Jackson way Decatur, Alabama
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    #3
    Let us know how the ring affects the hole shot. The torque on the R motors is so strong I would think very minimal if any at all venting is needed like Tim said.

  4. Member
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    #4
    Will do, weather permitting

  5. Member
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    #5
    The ring allegedly improves the holeshot on the 2 seater but it definitely hurt my Prosport on top. Scary loose.
    Allison XB21 Prosport Mercury Racing 250XS with a 1.75 Sporty

  6. Member
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    #6
    Allegedly weight distribution, proper venting, prop choice and foil choice effects holeshot.

    It’s as good as your willing to tweak

  7. BBC SPONSOR
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    #7
    Quote Originally Posted by NOTGSXR View Post
    The ring allegedly improves the holeshot on the 2 seater but it definitely hurt my Prosport on top. Scary loose.
    Different ring....

    The seal ring Jody is referring to goes on the base of the prop to seal off the prop/gear housing forcing all of the exhaust through the tube.
    Fastbass Marine LLC
    We specialize in NEW and USED ALLISON BOATS, Blazer Boats, Platinum Mercury Marine Repower Center, AquaTraction Flooring, and custom marine electronic installations on beautiful Kentucky and Barkley Lakes.

    2022 Allison XB-21 BasSport Pro Elite
    2022 Mercury 450R

    2012 Bullet 21ss
    2005 Mercury 300X

    https://youtu.be/FOnAGNWOgZ0

  8. Member
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    #8
    Interesting. I've wondered about that one.
    Allison XB21 Prosport Mercury Racing 250XS with a 1.75 Sporty

  9. Member fishnfireman's Avatar
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    #9
    Quote Originally Posted by Tim Powell View Post
    Different ring....

    The seal ring Jody is referring to goes on the base of the prop to seal off the prop/gear housing forcing all of the exhaust through the tube.
    NOTGSXR -- had me scratching my head wondering how in heck it could effect handling. Never did on my ProSport

  10. Member
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    #10
    Different ring.. IMG_20170910_36288.jpg
    Allison XB21 Prosport Mercury Racing 250XS with a 1.75 Sporty

  11. Member fishnfireman's Avatar
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    Apr 2005
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    #11
    Quote Originally Posted by jjbraud View Post
    First of all, my new 2+2 is awesome! 250R, 1/2" above pad, manual Allison jack plate, 30" Promax. Hole shot is great, but the damn venting at break-over is really annoying. I ordered the exhaust sealing ring for the Promax prop, but have read mixed reviews about the performance and how it kills the hole shot for some people. Does anyone have any experiences or advice to share?

    Sure is !!

  12. Member
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    Jacksonville, FL
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    #12
    Quote Originally Posted by Tim Powell View Post
    I dont think the ring will kill the 250R holeshot. We are running all holes plugged on everything, including the Max 5.

    There is a huge difference in the bottom end of the 250R and 250/300xs.
    How is the Max 5 doing with the new R motors?
    2015 Allison XB-21 BasSport Pro Elite
    2021 Mercury Racing 300R (1.75)

  13. BBC SPONSOR
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    #13
    Quote Originally Posted by CPA Basser View Post
    How is the Max 5 doing with the new R motors?
    Great, but I still have more testing to do before I can give final numbers.
    Fastbass Marine LLC
    We specialize in NEW and USED ALLISON BOATS, Blazer Boats, Platinum Mercury Marine Repower Center, AquaTraction Flooring, and custom marine electronic installations on beautiful Kentucky and Barkley Lakes.

    2022 Allison XB-21 BasSport Pro Elite
    2022 Mercury 450R

    2012 Bullet 21ss
    2005 Mercury 300X

    https://youtu.be/FOnAGNWOgZ0