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  1. #1
    CB750 Member Les Holt's Avatar
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    CB750 swingarm bushing size

    Looking for the O.D. of the factory bushing in the swingarm, anyone able to help??

    Les Holt

  2. #2
    CB750 Guru amc49's Avatar
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    You will likely be looking for an EXACT size to the decimal as the OD light pressfits into the arm tubing. You hammer them in lightly. So you need to estimate the amount of press (interference) there.

    I don't have clue as to the size but the bushings are available already in brass.

    https://cbxperformance.com/oscommerc...roducts_id=308

    There is rough measurement there but not exact enough for the pressfit.
    Last edited by amc49; 03-20-2020 at 05:54 PM.

  3. #3
    CB750 Member Les Holt's Avatar
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    Yeah, needing the exact size, I have my swingarm jig set up for the 750 arm now and am welding them up, just don't have my final tooling made yet to finish the critical dimensions yet. Thanks for the link.

    Les Holt

  4. #4
    CB750 Guru amc49's Avatar
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    Measure the bore in arm tubing and then increase the number by .0005"-.0010" for the press. Bear in mind the ID may shrink a bit with the press.

  5. #5
    CB750 Member Les Holt's Avatar
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    The exposed opening measures a non nominal size, I don't find these kind of measurements when measuring stock stuff so, unless I pull the good bushing out, probably ruining them, I'm left with asking. I'm sure I'll end up ordering a set to get the measurements and no issue here figuring out the amount of press needed.

    THanks

    Les Holt

  6. #6
    CB750 Guru amc49's Avatar
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    Got it, had assumed they were already out. If OEM then likely plastic ones and why the brass or bronze ones are better. Used them in my 550, the same size and pressed in fine and worked great.

  7. #7
    CB750 Member Les Holt's Avatar
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    amc49, guessing you have or dig AMC's?

  8. #8
    CB750 Guru amc49's Avatar
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    We used to dragrace AMC AMX cars, the true ones '68-'70.

  9. #9
    CB750 Member Les Holt's Avatar
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    I've got a 65 Rambler American 440H, doing a single turbo LS swap, ford 9" and 3.50 gears. Had a little of everything but dig ole ramblers.

    Click image for larger version. 

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  10. #10
    CB750 Guru amc49's Avatar
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    We had a couple of Hurst S/C Rambler Americans around the shop for a while, the ones with the factory hood scoop and the 390 4 speed. Our street race car was a beater full weight AMX single 4 bbl. 390 that ran 10.70s 1/4 mi. @130+ mph through the mufflers. We beat 454 Camaros and 426 true Hemi Mopar cars with it all day long. Not really fair though, most around here thought they knew how to build engines but usually couldn't. Later on we had a smallblock '64 Chevy II that ran in the nines with a 2 speed Powerglide. We did carb only, no super-c or turbo at all.

    We called the Ramblers Kelvinators for the refrigerator line, it just made other people even madder.

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