Speedometer question

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Apr 17, 2013 | 05:54 PM

Von_Zipper

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Road Warrior

Joined: Jul 2007

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From: Saint Amant, Acadiana

Speedometer question

It won't go much over 120, just a little bit and then it kind of looks maxed out while RPM is still increasing. Is this normal? Or I just have a bad speedo.

Apr 17, 2013 | 05:56 PM

2012SuperGlider

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From: Greeley, CO

Doesn't the speedo only go to 120 mph?

Apr 17, 2013 | 06:02 PM

Von_Zipper

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Road Warrior

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From: Saint Amant, Acadiana

Yea, but back then (when I was young and beautiful) speedos went way over max speed, one could estimate the actual speed.

Apr 17, 2013 | 09:11 PM

2012SuperGlider

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From: Greeley, CO

Pretty much everything is 'by wire' these days. I kind of doubt the speedo is still operated by a cable. I sure don't know that to be true. Maybe someone else will know but if it is electronic maybe it won't go past 120.

Apr 17, 2013 | 09:19 PM

Jester 08 Nightster

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Joined: Dec 2012

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From: Milton, PA

Quote:

Originally Posted by Von_Zipper

Yea, but back then (when I was young and beautiful) speedos went way over max speed, one could estimate the actual speed.

Back when I was younger, never beautiful we pinning the speedo, Never had anything that would wrap... Probably for the best....

Apr 17, 2013 | 09:29 PM

883drummer

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From: London Ontario Canada

i have an 06 and got mine up to 140km today would have kept going up but i slowed down

Apr 17, 2013 | 11:30 PM

2012SuperGlider

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From: Greeley, CO

Quote:

Originally Posted by 883drummer

i have an 06 and got mine up to 140km today would have kept going up but i slowed down

140 kph is only 87 mph.

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Apr 18, 2013 | 11:24 AM

MrPeepers

Cruiser

Joined: Aug 2012

Posts: 107

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From: Chicago

Quote:

Originally Posted by Von_Zipper

It won't go much over 120, just a little bit and then it kind of looks maxed out while RPM is still increasing. Is this normal? Or I just have a bad speedo.

If the RPM is legit you should be able to figure speed by the RPM... but I suppose that if the RPM is going up and the spedo says you ain't going any faster... then maybe you have a clutch slip problem at high speed esp with max wind resistance.

(PS sure you want to go 120mph+ on a Sportster?)

(PPS and by the way, according to my RPM/Speed chart for the 1200XL 127mph is 6200 RPM; redline is 6200; and the ECM will shut you down at 6000 RPM - 123mph)

Last edited by MrPeepers; Apr 18, 2013 at 11:29 AM.

Apr 18, 2013 | 03:29 PM

#10

Von_Zipper

Thread Starter

Road Warrior

Joined: Jul 2007

Posts: 1,898

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From: Saint Amant, Acadiana

MrPeepers,

first, I have an europulley in front, one more teeth, makes about 3% difference.
second, see my sig, FYI ThunderMax lets you set your own redline, mine is at 7100 (~7000 happens to be the RPM with my setup where switching to next gear starts making sense).