Speedometer

Speedometer won't pass 20mph

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white1j0
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Speedometer

#1

Post by white1j0 » Fri Jun 22, 2018 10:07 pm

Bought an original '47 speedo from a re builder, and it won't go past 20 mph, sent it back and he checked it on his calibration machine, ran it up to 75 mph, he said it worked fine, I have the correct 11 tooth worm gear on the drive, he text me back and asked me to try a different speedo before he disassembles it, the problem is I have another '47 Knuckle and a '52 Pan both have after market speedos with male connections, also the trans is completely rebuilt, So i'm looking for someone in my area Bucks County Pa.that may have any speedo with a female connection that would be willing to rent it for a couple hours, or any other suggestions, You can PM me, Thanks Whitey,



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Re: Speedometer

#2

Post by Andygears » Sat Jun 23, 2018 12:44 am

Maybe the cable? The square worn rounded or shortened where as the resistance increased, it rides over the square. Maybe disconnect the cable at the speedo and tape it to the shift gate, ride it and see or feel if the inner keeps increasing RPM's.

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white1j0
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Re: Speedometer

#3

Post by white1j0 » Sat Jun 23, 2018 1:08 am

Cable is brand new exact replica of original bought from the same re builder

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Re: Speedometer

#4

Post by RUBONE » Sat Jun 23, 2018 1:37 am

Put the speedo and cable on the '52 and see if it does the same thing. Are you sure the gear in the trans is correct, not just the drive worm, but the spiral gear?

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Re: Speedometer

#5

Post by ozwick86 » Sat Jun 23, 2018 6:16 am

Who rebuilt the your speedometer?

white1j0
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Re: Speedometer

#6

Post by white1j0 » Sat Jun 23, 2018 1:19 pm

Actually, the speedo is original and was bench tested before I bought it, and didn't need rebuilding, right now I can't exchange it to another one of my bikes for testing, beings it is at the re-builders, also it has the correct worm gear, 11teeth, which if was the wrong spiral in the trans, they wouldn't mesh, I'm going to try to make an adapter to adapt the inner cable to one of the aftermarket speedos, I'll see how that works

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Re: Speedometer

#7

Post by Buddhahoodvatoloco » Sun Jun 24, 2018 7:55 pm

Put a drill to it, and if it spins up past, say 50mph, your challenge is else where.

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Re: Speedometer

#8

Post by white1j0 » Sun Aug 05, 2018 1:42 pm

Still haven't ironed out this speedo problem, still won't go past 20 mph, I was told by the re builder not to put a drill to it, anyone know a reason why, I would like to try using a drill to spin the cable,to see if the speedo registers past 20 mph but I don't want to damage the speedo or new cable

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Re: Speedometer

#9

Post by 1950Panhead » Sun Aug 05, 2018 3:49 pm

Drills spin clockwise, you need counter clockwise, some drills have reverse, 1000 rpm=30 mph on knuckle speedo.

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Re: Speedometer

#10

Post by white1j0 » Sun Aug 05, 2018 9:07 pm

1950Panhead wrote:
Sun Aug 05, 2018 3:49 pm
Drills spin clockwise, you need counter clockwise, some drills have reverse, 1000 rpm=30 mph on knuckle speedo.
Thanks Panhead, speedo is working fine, must be an issue w/ the drive

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