Create your own blog: viewtopic.php?f=7&t=17487

Speedometer

Speedometer won't pass 20mph

Knucklehead topics
Post Reply
white1j0
Site sponsor
Site sponsor
Posts: 202
Joined: Mon Apr 09, 2012 7:38 pm
Bikes: '02 Fatboy, '47 Knuckle, '52Pan

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,



Andygears
Posts: 396
Joined: Tue Feb 05, 2013 12:25 am
Bikes: 1950 panhead, 1999 FLHTCI, 1987 FLHTC custom
Location: Daytona Beach

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.

All I got
Andygears

white1j0
Site sponsor
Site sponsor
Posts: 202
Joined: Mon Apr 09, 2012 7:38 pm
Bikes: '02 Fatboy, '47 Knuckle, '52Pan

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

RUBONE
Moderator
Posts: 4937
Joined: Sat Nov 15, 2008 4:09 am
Bikes: Multiple H-D, Ducati, BMW, Triumph, BSA,...

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?

ozwick86
Posts: 757
Joined: Sat Jul 17, 2004 4:06 am
Bikes: '59 Pan FLHF
Location: N. California

Re: Speedometer

#5

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

Who rebuilt the your speedometer?

white1j0
Site sponsor
Site sponsor
Posts: 202
Joined: Mon Apr 09, 2012 7:38 pm
Bikes: '02 Fatboy, '47 Knuckle, '52Pan

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

Buddhahoodvatoloco
Site sponsor
Site sponsor
Posts: 737
Joined: Wed Sep 07, 2016 7:13 pm
Bikes: 1969 FLF
1937 EL Sold
1949 rat bike Sold
1946 FL Sold
Location: san diego

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.

Post Reply

Return to “Knucklehead”