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Author Topic: 350f speedo help  (Read 776 times)

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Offline Jayelwin

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350f speedo help
« on: April 21, 2015, 04:48:33 PM »
So I finally took my wife's 350 for a ride as it's finally done.

Video is just showing off the bike.


I noticed that the speedometer goes up to 20 mph and no further. And when you slow down it only goes down to 10 mph until the bike sits for a while. So it's shot. What model bikes would have a drop in solution to replace it? I'm guessing the 400f would be the same? I'd also be afraid that some old speedometer coming off some non runner would be likely to be bad. And of course the mileage would be off. (The current speedo is original based on the mileage on the title).

Or can these be opened and fixed? Watching the 750 faces videos I'm sure it would be a challenge.

Thanks.
« Last Edit: April 21, 2015, 04:50:31 PM by Jayelwin »
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Offline calj737

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Re: 350f speedo help
« Reply #1 on: April 21, 2015, 04:53:19 PM »
First, disconnect the cable at the axle and insert the tab into a drill and spin it. This should operate the speedo. If not, your gauge needs servicing/rebuilding. If the gauge functions, examine and lube the cable, and disassemble, clean and re-grease the speedo gear.
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline Jayelwin

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Re: 350f speedo help
« Reply #2 on: April 21, 2015, 04:58:27 PM »
the cable is brand new and spins fine when the front wheel turns. It goes up to 20 mph just like it should, it just goes no further.

What does "Servicing/rebuilding" entail?
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Offline calj737

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Re: 350f speedo help
« Reply #3 on: April 21, 2015, 05:12:45 PM »
Drop the front wheel, slide the speedo gear off the hub/axle. Disassemble and clean and lube.

As for testing the cable with a drill, it's more about whether the gauge works from a drill versus from the speedo gear. (You're substituting the drill for the gear)
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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline Jayelwin

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Re: 350f speedo help
« Reply #4 on: April 21, 2015, 06:27:09 PM »
CAble all the way down to the wheel works great.

When I spin the speedo with a drill at full drill speed it slowly creeps up to 10 MPH and then when I stop it slowly drifts back down.

If I could open the speedo up I guess I could try to clean and lube it.
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Offline Jayelwin

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Re: 350f speedo help
« Reply #5 on: April 21, 2015, 06:43:15 PM »
Well I watched Marcel's video and opened it up. The cylinder that moves the needle was covered with some clear goop which I wiped off and I got the needle moving back and forth.

Now my cheap cordless drill gets the speedo to 38 MPH nicely when at full speed - anyone know if 38 MPH is correct for a drill?

What and where should I lube?
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