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  1. #1

    Default Hard shifting BF90

    The bf90 on my 17’ 03 Arima Sea Pace shifts way too hard. It is not the control box or the cables.

    When the shift cable is disconnected at the motor everything is smooth as silk.

    With the cable disconnected, it is impossible to rotate the shift shaft by hand. With the cable disconnected, the only way the shift shaft to move is to tap on the plate that the cable actuates with a hammer and a wooden drift. With the cable disconnected, the controls are easy and smooth. i.e. I'm pretty confident it is not the cables or the control box.

    When everything is connected, it shifts fine into forward and reverse with no grinding and the throttle behaves as it should. It's just waaaaay to stiff.

    Any ideas where the resistance is coming from? Boat is in the water now.

    Thanks in advance for any suggestions.

    Bill B.
    Last edited by bill_black; 06-29-2020 at 09:54 AM.

  2. #2
    Join Date
    Nov 2009
    Location
    temecula, ca., usa
    Posts
    3,492

    Default Re: Hard shifting BF90

    Just a guess but there are 2 bushings that may be part of the problem. Items 16 & 17 in the link illustration.

    Have you tried isolating the two throttle cables under the hood to check if one is stiff?

    Lots of moving parts in this set up and they all have to work in unison.


    https://www.boats.net/catalog/honda/...04/shift-shaft

    Hopefully someone else here can give you the silver bullet answer.

    Good luck
    Last edited by jgmo; 06-30-2020 at 07:22 AM.

  3. #3

    Default Re: Hard shifting BF90

    I guess I would pull the lower unit next, in an attempt to isolate the point where the issue is located.

  4. #4

    Default Re: Hard shifting BF90

    Thanks to both of you. I'm pretty confident the resistance is 'above' the lower unit, but I will confirm when I pull the boat out next time and remove the lower unit. Those two bushings look pretty buried, and both are behind water seals. Given the access I have with the motor assembled, I don't see how I can apply penetrating oil and hope against odds that it will work its way into the bushing. Maybe I can rig up a fine syringe and inject some around the id or od of the seal for the #4 shift shaft....dump as much as I can in there.......and hope is works its way down to the #16 and #17 bushings. It can't hurt anyway.

    Oh and regarding the throttle cables: with the shift cable disconnected and the throttle cables connected, the control box arm at the helm operates with ease.

  5. #5
    Join Date
    Nov 2009
    Location
    temecula, ca., usa
    Posts
    3,492

    Default Re: Hard shifting BF90

    Well, I don't think oiling those bushings is necessary. Being bushings they probably aren't tight but could be just the opposite...wallowed out and letting those sectors "cock and bind". I don't know
    Like I said, just a guess.
    I would still check those throttle cables for sticking and pull the lower end before assuming the bushings need to be hassled with. Because, as you say, they are buried and would truly be a hassle to replace.
    Let's see who else weighs in on this. There are more folks here with way more expertise on these than I will ever have. Hopefully they will chime in soon for you.

  6. #6
    Join Date
    Jul 2008
    Location
    Tauranga New Zealand
    Posts
    150

    Default Re: Hard shifting BF90

    Something to consider. When a cable is dry and binding when connected at both ends under load, it will often be free and easy to move with one end disconnected e.g. under no load.

    Bob

  7. #7
    Join Date
    Jul 2008
    Location
    Tauranga New Zealand
    Posts
    150

    Default Re: Hard shifting BF90

    I presume that with the shift cable disconnected, you are trying to rotate the shift shaft with either the engine running or with someone rotating the prop. Otherwise the clutch dogs are unlikely to align and engagement of forward or reverse will be very difficult.

    Bob

  8. #8
    Join Date
    Apr 2018
    Posts
    1,298

    Default Re: Hard shifting BF90

    You will find the shift shaft driver in the mount case is seized in the nylon bushes. Unfortunately your only solution is to remove the power head, remove the shifter and clean and or replace the bushes and seal. No other way out of this I'm afraid.

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