speedo noise and eratic function

markymark2 · Post by **markymark2** » Wed May 13, 2009 4:54 pm

my speedo and drive head have been acting up lately, at first it was a whinig sound every now and then coming from the front wheel , then i had noticed the speedo drive head at the front wheel was starting to over rotate causing the spedo cable to bend and bind. in problem solving i have temperarily stiffened up the speedo cable at the point of where it binds because of the over rotating drive head at the front wheel. i have also lubed up the inner speedo cable. now with the drive head unable to rotate around and bind at the front wheel i find the speedo needle bounces and jumps up to the maximum speed while creating a terrible whine from the speedo unit cluster. anyone experience this? how do i keep the drive unit at the wheel from over rotating? what should i be looking at to remedy the speedo needle bouncing and maxing out at slow speeds. is the problem the drive unit at the wheel, the cable or the speedo unit itself? any help or advice would be greatly appreciated. thanks

markymark2 · Post by **markymark2** » Wed May 13, 2009 4:56 pm

sorry i forgot to add , 1964 cb77 superhawk

LOUD MOUSE · Post by **LOUD MOUSE** » Wed May 13, 2009 7:08 pm

If ya have the drive installed correctly the adjustment is made by adjusting the axle nut (loosen the tightening bolt left side) and spin the wheel until the drive just floats rather than rotate. Be sure there is plenty of lube in the drive unit. ......lm

markymark2 wrote:my speedo and drive head have been acting up lately, at first it was a whinig sound every now and then coming from the front wheel , then i had noticed the speedo drive head at the front wheel was starting to over rotate causing the spedo cable to bend and bind. in problem solving i have temperarily stiffened up the speedo cable at the point of where it binds because of the over rotating drive head at the front wheel. i have also lubed up the inner speedo cable. now with the drive head unable to rotate around and bind at the front wheel i find the speedo needle bounces and jumps up to the maximum speed while creating a terrible whine from the speedo unit cluster. anyone experience this? how do i keep the drive unit at the wheel from over rotating? what should i be looking at to remedy the speedo needle bouncing and maxing out at slow speeds. is the problem the drive unit at the wheel, the cable or the speedo unit itself? any help or advice would be greatly appreciated. thanks

davomoto · Post by **davomoto** » Wed May 13, 2009 8:15 pm

There are two taps on the drive unit, that must line up with the slots in the hub. If intalled incorectly, they will bend back, and not contact slots properly. Take your time, and check to make sure all parts are installed correctly.

davomoto

jleewebb · Post by **jleewebb** » Wed May 13, 2009 9:57 pm

When I had a similar problem I was advised to remove the inner cable entirely to avoid possible damage to speedo unit since I was planning to keep riding it and it took awhile to sort out problem with the drive.

After following LM's directions to loosen clamp bolt on left side and tighten the axle nut to hold drive unit firmly where it wants to be, you can look down in hole where cable attaches and see the part that drives the cable turning when you spin the front wheel, assuming you've got the tabs and notches aligned correctly. Since you say speedo jumping happens at low speed, any jerkiness in drive unit might reveal itself.

My understanding is that jumping is often caused by binding cable that spins slow when it binds then spins fast as it gets more torque wound up on drive side of bind and releases.

Hope this helps, good luck...Lee

markymark2 · Post by **markymark2** » Fri May 15, 2009 6:43 pm

FIXED

thanks to all your input i was able to fix this problem.

i took off the drive gear at the wheel, cleaned it, lubed it, put it on correctly, tightened axle nut properly, lubed the inner speedo cable, and now she is running as it should.

thanks for all the advice in such a timely and helpful manner.

LOUD MOUSE · Post by **LOUD MOUSE** » Fri May 15, 2009 7:28 pm

YA BE WELCOME YA KNOW. .........lm

markymark2 wrote:FIXED

thanks to all your input i was able to fix this problem.

i took off the drive gear at the wheel, cleaned it, lubed it, put it on correctly, tightened axle nut properly, lubed the inner speedo cable, and now she is running as it should.

thanks for all the advice in such a timely and helpful manner.

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speedo noise and eratic function

speedo noise and eratic function

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