Results 1 to 9 of 9

Thread: 1947 knucklehead inner speedometer cable length

  1. #1

    1947 knucklehead inner speedometer cable length

    Anyone have measurements of what the speedometer inner cable length should be for a 47 knucklehead? Thanks in advance for any info you could share. New cable was installed & getting speedometer bounce. This was a rebuild and did not have a inner outer cable & housing to measure from.

  2. #2

    Re: 1947 knucklehead inner speedometer cable length

    Speedometer bounce is usually caused by automotive speedo parts being used in it.
    Chris Haynes
    A.M.C.A. Member
    Costco Member
    I can't Re Member
    http://vintageamericanmotorcycles.com/
    Be sure to register so you can view large photos

  3. #3

    Re: 1947 knucklehead inner speedometer cable length

    Repro speedo built for 47 year. Maybe repro is why. The needle would not move, cut the cable down on each end about 1/16" but now it bounces.

  4. #4

    Re: 1947 knucklehead inner speedometer cable length

    Bounce is many times caused by bind in the cable or a cable that needs lube. If cable is ok you probably need a different speedometer. I doubt anyone will work on a reproduction.

  5. #5

    Re: 1947 knucklehead inner speedometer cable length

    When I installed the speedo, the needle would not move. I removed the speedo, then removing the drive side, reinstalled the cable into the speedo and then used a drill run in reverse to the drive side end. The speedo worked as it should, it operated smoothly with no bounce. Then reinstalling it, figured the inner cable was too long and trimmed a small amount from each end. It operated but bounced. Removed the cable again trimming off a small amount again. Same result somewhat improved. What I am thinking is the locked in place cable stop on each end might leave the engaging ends with the what looks to be soldered cable stop to either be too short or long. Don't want to keep trimming the ends as at some point the ends will not extend far enough to seat into the drive end or speedo end. Might have to get a new inner cable installed but with that wondering the length and how far the cable stops should be seated onto the cable.

  6. #6
    Join Date
    Jan 2014
    Location
    Bethesda, Ohio
    Posts
    407

    Re: 1947 knucklehead inner speedometer cable length

    How about lubing the cable? Would that help ??
    98 FLSTC TRIKE
    60 VW TRIKE-HOMEMADE
    68 TRIUMPH 650 TIGER CHOPPER

    You Ain't A Man Till You've Rode A Pan, I'm A Man...

  7. #7

    Re: 1947 knucklehead inner speedometer cable length

    Quote Originally Posted by 29Abone View Post
    How about lubing the cable? Would that help ??
    Did that already. Still bounces.

  8. #8
    Join Date
    Mar 2008
    Location
    Beautiful Northern NM
    Posts
    12,485

    Re: 1947 knucklehead inner speedometer cable length

    Is it a large diameter outer with a skinny generic inner? If the cable whips it will bounce. Speedometers (magnetic type like SW) have a spinning magnet driven by the cable with a cup over it attached to the needle. When the magnet spins the cup is attracted to the magnet and is drawn around, the springs and calibration weight controls the rate of spin. If the cable whips, it momentarily speeds up the magnet causing a magnetic wave making the speedo jump.
    Friends help friends move,
    Real friends help friends move bodies!

  9. #9

    Re: 1947 knucklehead inner speedometer cable length

    Yes, large outer, narrow inner cable. With that am thinking of using an old oem original that was near siezed up. Cleaned it in diesel, then let it soak in a rust inhibito/lubricant called CarWell CP90. Great penetrant and lube too. So, will change out the repro cable with the old original. The reason the old cable was not used is it has the patina (rust) of a 60+ year old cable. The bike was a complete restoration so it really looked out of place. Thank you all for your replies & Merry Christmas & Happy New Year!

Thread Information

Users Browsing this Thread

There are currently 2 users browsing this thread. (0 members and 2 guests)

Similar Threads

  1. XCLCH Speedometer Cable Length
    By Bill Pedalino in forum Harley 1936-1964
    Replies: 6
    Last Post: 03-21-2016, 04:38 PM
  2. WANTED: 1947 Knucklehead Speedometer
    By 47knuknuk in forum Motorcycles & Parts Wanted
    Replies: 12
    Last Post: 06-03-2014, 01:36 PM
  3. WANTED: 1947 Knucklehead Offset forks stock length.('47-'48)
    By 47knuknuk in forum Motorcycles & Parts Wanted
    Replies: 0
    Last Post: 09-24-2012, 05:06 PM
  4. wanted-Knucklehead Speedometer Cable Stewart Warner
    By tomcat1 in forum Motorcycles & Parts Wanted
    Replies: 2
    Last Post: 02-02-2012, 09:03 PM
  5. Speedometer Cable Length?
    By Bigincher in forum Engine, Transmission & Clutch
    Replies: 5
    Last Post: 08-22-2010, 05:29 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •