496HO X Drive problem???
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496HO X Drive problem???

  1. #1
    Senior Member Wishful Thinking!'s Avatar
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    Default 496HO X Drive problem???

    We were coming across the lake Saturday afternoon and a pretty odd thing begans happening. While doing about 3k rpms we start slowly slowing down. At frist I didn't really even notice it till I realize I'm add throttle and the rpm's are climbing but the speed is not.

    At about 3500 rpm's and the speed is down to about 22 mph, I see the rpm's drop about 4 or 500 and the speed increases to 30 or so. Its almost like the prop was slipping then not???? As if there is air around the prop and then it goes away and all is back to normal except in a few mins it does it again.

    The sound of the engine "seems" louder during the "slipping" time and normal when the speed picks back up?

    Any thoughts?
    First boat - 1968 Starcraft 14' 40hp
    Second boat - 1982 15.5' Glastron 115hp
    Current boat #1 1987 Ski Nautique 230 hp
    Currnet boat #2 - 2005 Magic DB 425 hp

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  3. #2
    Ultra26 # 1
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    Quote Originally Posted by Wishful Thinking! View Post
    We were coming across the lake Saturday afternoon and a pretty odd thing begans happening. While doing about 3k rpms we start slowly slowing down. At frist I didn't really even notice it till I realize I'm add throttle and the rpm's are climbing but the speed is not.

    At about 3500 rpm's and the speed is down to about 22 mph, I see the rpm's drop about 4 or 500 and the speed increases to 30 or so. Its almost like the prop was slipping then not???? As if there is air around the prop and then it goes away and all is back to normal except in a few mins it does it again.

    The sound of the engine "seems" louder during the "slipping" time and normal when the speed picks back up?

    Any thoughts?

    Weeds or grass covering the prop.

  4. #3
    Senior Member Wishful Thinking!'s Avatar
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    Quote Originally Posted by Ultra26 # 1 View Post
    Weeds or grass covering the prop.

    Not at all... open water. I stopped, raise the drive to make sure the prop nut lock washer was still in place. Every few mins it would do it again.
    First boat - 1968 Starcraft 14' 40hp
    Second boat - 1982 15.5' Glastron 115hp
    Current boat #1 1987 Ski Nautique 230 hp
    Currnet boat #2 - 2005 Magic DB 425 hp

  5. #4
    Ultra26 # 1
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    Quote Originally Posted by Wishful Thinking! View Post
    Not at all... open water. I stopped, raise the drive to make sure the prop nut lock washer was still in place. Every few mins it would do it again.
    Based on your description, something is slipping. Not sure if the prop hub could slip or if there are clutches in the drive that could slip, but again something is slipping. I would have the drive checked by a qualified tech.

    Again, are you positive you weren't dragging the drive?? I've had Bravo drives for 20 years and have never heard of a Bravo drive that slips. A good qualified tech might be your only answer.

    Good luck to you

  6. #5
    The Insurance Guy millhouse961's Avatar
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    I have had a similar thing happen on a small lake by my house. I checked everything and no issues with the drive...all I could chalk it up to was prop slip for some reason. One theory i had (no clue if there is any validity to this) is pockets of colder or warmer water in the lake would change the density of the water and possbily increase the normal slip. It only happened to me on that one day and never again. Weird.
    2003 Cobra 270 Razor

  7. #6
    Senior Member Wishful Thinking!'s Avatar
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    Same lake I've boated on for, omg... 42 years..lol. Its 50K acres. Taking it to the shop tomorrow at 9am. I'm wondering if the tach could be bad. I have one go bad on my ski nautique years ago and all sort of odd things were happening. I call a engine guy, told him the problems, he told me to cut the tach wire and everything cleared up.
    Last edited by Wishful Thinking!; 05-10-2011 at 02:04 PM.
    First boat - 1968 Starcraft 14' 40hp
    Second boat - 1982 15.5' Glastron 115hp
    Current boat #1 1987 Ski Nautique 230 hp
    Currnet boat #2 - 2005 Magic DB 425 hp

  8. #7
    The Insurance Guy millhouse961's Avatar
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    Quote Originally Posted by Wishful Thinking! View Post
    Same lake I've boated on for, omg... 42 years..lol. Taking it to the shop tomorrow at 9am. I'm wondering if the tach could be bad. I have one go bad on my ski nautique years ago and all sort of odd things were happening. I call a engine guy, told him the problems, he told me to cut the tach wire and everything cleared up.
    Ah, good point. I have had issues with my tach "wandering". That very well could be it
    2003 Cobra 270 Razor

  9. #8
    Senior Member Wishful Thinking!'s Avatar
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    I sure hope so.. that would be a easy fix. We have a poker run with week end! The ski nautique is way to small for open water these days!

    oh great pictures of your kids on the other thread!
    First boat - 1968 Starcraft 14' 40hp
    Second boat - 1982 15.5' Glastron 115hp
    Current boat #1 1987 Ski Nautique 230 hp
    Currnet boat #2 - 2005 Magic DB 425 hp

  10. #9
    It's what we do BDMarine's Avatar
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    I would bet the prop hub is failing.
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  11. #10
    Senior Member rshrp2003's Avatar
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    I agree if the prop hub is plastic. It Should be steel . Hope thats it , It would be a quick fix.

  12. #11
    New here Beer:30's Avatar
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    Quote Originally Posted by BDMarine View Post
    I would bet the prop hub is failing.
    Either that, or, could it be the coupler? I haven't seen one apart, so I don't know if it can slip? or would it just shear without slippage?
    Quote Originally Posted by gn7 View Post
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  13. #12
    Senior Member Wishful Thinking!'s Avatar
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    Problem solved! I took it to the shop yesterday and he put it on the computer to be sure everything was working properly and to check to see if the tach was working correctly.

    Everything checked out 100%

    I could not remember the last time I changed the fuel filter and I had just used a full tank of ethanol gas so he suggested I change the filter. I did and went to the lake.

    SAME THING!!!!!!!!!! At 3k rpms the boat actually slowed and slipped off plane. The only thing different I had done to the boat was to add a drive shower................ so yes I took it off and everything is fine!!!!!!!!!!!!!!!!


    I have so much trouble believing it I went back to the lake last night to be sure it was all good.... and it is! The only thing that make sense to me is the shower's pickups were somehow introducing turbulence and or air to the prop?????????????
    First boat - 1968 Starcraft 14' 40hp
    Second boat - 1982 15.5' Glastron 115hp
    Current boat #1 1987 Ski Nautique 230 hp
    Currnet boat #2 - 2005 Magic DB 425 hp

  14. #13
    Senior Member Wishful Thinking!'s Avatar
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    Quote Originally Posted by Beer:30 View Post
    Either that, or, could it be the coupler? I haven't seen one apart, so I don't know if it can slip? or would it just shear without slippage?

    Sparky (the machanic) suggested the coupler but said once they start to slip they don't stop so he ruled that out
    First boat - 1968 Starcraft 14' 40hp
    Second boat - 1982 15.5' Glastron 115hp
    Current boat #1 1987 Ski Nautique 230 hp
    Currnet boat #2 - 2005 Magic DB 425 hp

  15. #14
    Ultra26 # 1
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    Quote Originally Posted by Wishful Thinking! View Post
    Problem solved! I took it to the shop yesterday and he put it on the computer to be sure everything was working properly and to check to see if the tach was working correctly.

    Everything checked out 100%

    I could not remember the last time I changed the fuel filter and I had just used a full tank of ethanol gas so he suggested I change the filter. I did and went to the lake.

    SAME THING!!!!!!!!!! At 3k rpms the boat actually slowed and slipped off plane. The only thing different I had done to the boat was to add a drive shower................ so yes I took it off and everything is fine!!!!!!!!!!!!!!!!


    I have so much trouble believing it I went back to the lake last night to be sure it was all good.... and it is! The only thing that make sense to me is the shower's pickups were somehow introducing turbulence and or air to the prop?????????????
    Glad you figured it out.

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