I have replaced the cable, stripped and cleaned the speedo drive, cleaned the drive on the wheel hub and tried two sets of clocks. Speedo works for about a hundred yards then needle drops to zero. With cable off rotating front wheel, speedo drive appears to rotate correctly. With electric drill attached to cable, speedo shows up to 60mph. I'm running out of ideas, any suggestions welcome.
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Re: Any ideas why my speedo doesn't work ??
Hi, James baffling isn't it for such a simple mechanical apparatus lets break it down:
1. Speedo works validated by the drill.
2. Cable works validated by the fact it's new.
3. Speedometer drive is all that's left needs to be validated by disconnecting the speedometer cable from the speedometer, getting the front wheel off the ground and spinning it to see if the new cable is turning in the housing, my guess is the speedometer drive unit tab is either broken or not properly indexed.
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the inside is damaged. The speedometer works by a magnet spinning close to a metal disc that is attached to the needle. Yours is likely touching and the magnet is actually driving the needle as though it is connected. You need to send it to a speedo repairer for repair and recalibration.
Hi, speedo hubs work in quite a few ways. 2 notches, 4 notches, rotating flange etc. Check the section the hub fits onto/into make sure the hub and its counter part are a mirror image configuration. See if turning the hub gently onto/into its counterpart will allow the hub to fully seat. I have had many problems with my Suzuki SV I have to make sure the hub and the front wheel speedo drive section are fully mated before refitting the front wheel.
Have you checked that the flexy shaft rotates when you spin the front wheel to check remove cable from back of speedo and put a bit of tape on shaft so if shaft turns you will see it
If it not turning cable may be broken if not remove wheel to inspect hub drive parts for damage and source replacements for damaged parts if any
If every thing above is OK the clock is the problem working on them is difficult so a replacement would be best
Your speedometer is driven by the transmission on your '70 model FLH. But, if you want to put a front wheel speedo drive on the bike, first take a look at a bike that has a front wheel speedo drive. You'll notice that the hub right where the axle goes through has a "notch" in it and the speedo drive has a "tab" that goes into the notch. As the wheel turns, the hub turns the speedo drive. This is how it works.
Now, you have two problems, One is that you need a speedo drive that has the spacer built into it so that you can eliminate a spacer on one side of the hub. Next, is the ratio of the speedo drive. The ratio of the speedo drive must match the speedo or the indicated speed will be incorrect. The speedo ratio for your FLH is probably 1:1 since it's a transmission driven speedo.
Is the speedo drive on the front wheel. The little tang on the speedo drive broke off and is slipping out of the hole and spinning around the hub of the wheel. It will get progressively worse. Easy fix- buy a new speedo drive and install it and if there is a bur in the hole on the hub repair it or it wil just ruin your new drive.
First, remove the lower end of the speedo cable from the speedo gear box on the front axle. Then, lift the front wheel off the ground and remove the wheel. To remove the speedo-drive gear box, unscrew the axle nut that holds it in place. With the speedo-drive removed, inspect the two flanges that fit into the slots on the wheel hub, making sure they haven't gotten bent - or sheared off. When you turn flange on the speedo-drive, it should turn freely and you should be able to see the speedo cable drive-blade spinning. If not, then you will need to replace the whole unit because the worm gear inside has become excessively worn.
Check the front wheel. The speedo drive normally resides on the front wheel hub. Take a look at that and see if it looks normal, I'm thinking your cable broke inside the speedo drive which made the "pop" sound. There is a possibility the drive could also have cratered but this will have to be determined when the speedo drive is removed from the front axle and inspected for damage and function.
GOOD MORN SNOWED 18 INCHES ENGAGED FOUR WHEEL DRIVE IN BOTH HIGH AND LOW, FRONT LEFT WHEEL NOT PULLING RIGHT FRONT DID PULL. RODE AROUND FOR A WHILE. WHILE PARKING THE TRUCK IN MY DRIVEWAY THE FRONT RIGHT STOPPED PULLING IM STUCK IN SNOW NOW. TEN MINUTES BEFORE RIGHT WHEEL STOPPED PULLING THE DFROSTER BLOWER MOTOR STOPPED BLOWING ANY IDEAS