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  1. #1

    Join Date
    Aug 2019
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    8

    Default Mainshaft length and open primary question

    Hi guys. I have a 83 shovel that started life as a low rider. When I picked it up it still had the oem belt primary and belt final drive set up. I removed the final drive pulley and fitted a sprocket, also I'm gonna run a bdl open primary. Now with the sprocket and bearing support fitted it looks like the clutch hub is sitting too far from the bearing support.. I'm waiting to get my motor back from a rebuild so I cant bolt it in the the frame to check alignment.
    Has anyone got a photo of their clutch hub to compare to mine and can anyone confirm my mainshaft is longer than ones that came with chain drive??
    Thanks
    Click image for larger version. 

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  2. #2
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    Your mainshaft is made for the belt final drive models ...

    Click image for larger version. 

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  3. #3

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    Aug 2019
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    Isn't the 13.72" mainshaft in that photo for later 5 speed trans though? Mine is a 4 speed cowpie

  4. #4
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    Just a few years that the 4-speed was made with belt finale drive.

    Think it was in 81 the Mo-Co first came out with the rear belt on the Sturgis then followed by the FLH models...

  5. #5
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    Quote Originally Posted by mudmane View Post
    Isn't the 13.72" mainshaft in that photo for later 5 speed trans though? Mine is a 4 speed cowpie
    Your going to have to swap out the shaft............

  6. #6
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    Default

    Contact BDL they can likely supply an offset front pulley. Worth a shot..

  7. #7

    Join Date
    Dec 2018
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    1,074

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    Relax, you're fine. Just put it together. Four speed mainshafts '70 - up stick out from the main drive gear 3". Your aftermarket bearing support is very close to the sprocket (and may be for a '65 - '69 application) and that makes the clutch hub look like it is hanging out in space.

    Jim

  8. #8
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    I'll bet his trans needs looking at anyways............

  9. #9
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    Quote Originally Posted by Tattooo View Post
    I'll bet his trans needs looking at anyways............
    Yup ... ^^

    With fourth gear riding on a torrington bearing, it's a given .. !!

  10. #10

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    Aug 2019
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    Quote Originally Posted by Tattooo View Post
    I'll bet his trans needs looking at anyways............
    I've pulled the lid and everything looks pretty good.

    Thanks for your replies. Get my motor back soon so I can check alignment. If it's no good the mainshaft is coming out!

  11. #11
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    Quote Originally Posted by mudmane View Post
    I've pulled the lid and everything looks pretty good.
    Just because it looks pretty good to you doesn't mean much as you can't see the bearing on the main shaft from the top........

    But if it looks good to you run it....... The only thing you will have to do if it isn't good is take it back apart that's all........

  12. #12

    Join Date
    Dec 2018
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    1,074

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    FYI:
    When converting from the belt pulley to the chain sprocket you must:

    1) a) use the -80 sprocket, flat on both sides
    or
    b) install the early style sprocket with the undercut side facing out.

    2) a) install a sprocket spacer, 35079-80
    or
    b) replace the belt drive seal spacer with a chain drive spacer, 35079-82A.

    That will put the sprocket in the right place at the transmission.

    Jim

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