CB350 Sprocket Studs STUCK in Hub
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  1. #1
    Senior Member jakec's Avatar
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    CB350 Sprocket Studs STUCK in Hub

    I am replacing one of the sprocket studs on my dad's 350. One of them sheared right off at some point and I just noticed it the other day so I am replacing it and giving him a new chain.

    I went to take the sprocket off the wheel, got it off no problem. Of the studs, two slid out with no resistance. Luckily one of them was the broken one.

    The other two were VERY stuck and did not want to move at all. I was able to use the "two nut" method to at least rotate one of them to the correct orientation so that it lines up with the sprocket (they were all pointing in random directions before).

    However on this last one it will not rotate, much less come out. I have tried the two nuts, only to see the stud rotate a little bit, maybe 5* or more, only to snap back to where it was when I stop pushing on the wrench. I am using a 16" wrench and working hard to get it to turn. I have also used PB blaster on front and back, and tried smacking it from the back (inside the hub) with no luck.

    At the minimum I just need to rotate it like 1/8 turn so it will be facing the correct direction (flat side toward center of hub).

    CB350 Sprocket Studs STUCK in Hub-img_8094.jpgClick image for larger version. 

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    1975 CB400 F0 Stock
    1974 CB550 K0 Chopper
    1970 CL350 K2 Stock

  2. #2
    Supporting Member Yendor's Avatar
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    Paticience - Let the PB Blaster do it's thing.
    Soak it daily or even twice daily for a cople of days and come back to it.
    1970 CB 350 CAFE - Current Project on the bench,
    1972 CB 350 K4 Red - Now a Happy Rider ! !
    1972 CB 350 K4 Green (My Sons) DONE - YES !,
    1st Bike 1970 SL 350 (Brought home in Parts - Trailer/Trunk/Back Seat - I miss that bike),
    2nd - Bike Kawasaki 750
    3rd - '73 XLCH 1000

  3. #3
    Senior Member jakec's Avatar
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    Thanks. I just did some additional reading on here and it looks like the metal sleeve in the inside of the bushing is rusted to the stud. That's why it can rotate slightly, the bushing is twisting a bit. I had to put the wheel back on the bike so I could move it. I suppose I will get it off again and go to soaking the studs. I didn't see many other options on here aside from pounding, which I will also try again after soaking.
    1975 CB400 F0 Stock
    1974 CB550 K0 Chopper
    1970 CL350 K2 Stock

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  5. #4
    Senior Member jakec's Avatar
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    So I soaked both sides off and on for three days. Just tried some heat as well.trying the same stuff as before, and getting nowhere. Trying to use two nuts is just ruining the threads on the stud. It isn’t budging.
    1975 CB400 F0 Stock
    1974 CB550 K0 Chopper
    1970 CL350 K2 Stock

  6. #5
    Senior Member jakec's Avatar
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    I ended up using a cutting wheel on a dremel and shaping the stud to fit. Since it wouldn't rotate I just made the side facing center flat. This worked for me. I also hade a broken tongue washer (retains sprocket nuts) so I used M10 x 1.00 Nylock nuts and they worked out (so far).
    1975 CB400 F0 Stock
    1974 CB550 K0 Chopper
    1970 CL350 K2 Stock

  7. #6
    Senior Member ancientdad's Avatar
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    I'm not sure if the 350 hub is like some, but in some cases you can drive the stud out from the backside - inside the brake drum. But after all you've been through with it, I'm sure you probably looked
    Tom

    Ride along at the drag strip - https://www.youtube.com/watch?v=20jFPazXlvU



    running points... because I'm too old for mysteries that begin with pushing

  8. #7
    Senior Member jakec's Avatar
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    I noticed that, and I was applying PB blaster and hitting the back with no luck.
    1975 CB400 F0 Stock
    1974 CB550 K0 Chopper
    1970 CL350 K2 Stock

  9. #8
    Senior Member ancientdad's Avatar
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    Wow... that's beyond what I would have expected, so they must really be rusted in there
    Tom

    Ride along at the drag strip - https://www.youtube.com/watch?v=20jFPazXlvU



    running points... because I'm too old for mysteries that begin with pushing

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