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  #1  
Old 07-15-2012, 03:00 PM
JeremyL JeremyL is offline
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Is my speedometer wrong?

I took my XS out for a ride today and had just put a new ebay Motion Pro speedo cable on. The old cable wouldn't stay in the housing so I rode without a speedometer. The bike I had before the XS was a CBR 600 and I had a problem of misjudging my speed by thinking I was going slower than I really was. I would be crusing along at 70mph thinking I was doing the 50mph limit. I am wondering if my speedometer is wrong or if I am having the opposite problem on this bike. Today in a 55mph zone I felt like I was going 55-60 but my speedo reported 45mph. When I would take it up to a reported 70 I felt like I was going 90! Maybe its the lack of fairings and a windshield that makes it feel faster?

I noticed in 5th gear I was going a reported 45mph or so at exactly 4000rpm. Is that about right? Feels wound pretty tight for only 45 but I know everyone says these bikes are geared low. I am not really complaining but just trying to figure out if my speedo is off so I dont get get a ticket for going 15mph faster than I think I am doing.
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Old 07-15-2012, 03:32 PM
LuckyEddie LuckyEddie is offline
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rate of speed

Using the mile markers on the highway, time yourself from one to the next.
Marker to marker in 60 seconds is 60 mph.
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  #3  
Old 07-15-2012, 03:44 PM
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DGXSER DGXSER is offline
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The speedos on these bikes are very likely to be off, but 4k at about 45 in 5th is about right. 5k should be about 70 MPH in 5th gear.

MY first XS was off by about 5 MPH.
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  #4  
Old 07-15-2012, 03:55 PM
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Actually 4k should be about 55 or 60 with the stock FD. 4k is 70 with the 850 FD on mine and 4th with it is aproximately the same as 5th stock and 4k in 4th on mine is aproximately 60.
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80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

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Old 07-15-2012, 05:37 PM
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On mine 4k in 5th is about 60mph.
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Old 07-15-2012, 05:56 PM
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4K about 60 in 5th gear 1980 G
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Old 07-15-2012, 07:03 PM
JeremyL JeremyL is offline
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Well I was just GUESSING that 4000RPM in 5th was more like 60mph instead of the indicated 45mph. There's a heavily policed stretch of highway I was riding on and almost everyone always goes 55-60mph and when I was going an indicated 45mph everyone else was staying about the same speed as me. I thought either my speedo is wrong or everyone is going slow today for some reason.

Could it be the cable? The ends looked just like it had a square piece on each end so I wouldn't think the cable could change the rate that the speedometer worked. One thing though, my old cable slid into the speedometer unit on the rim and then bolted on to keep it in place. The new one had screw-on fittings on each end so, to tide me over, I just pushed the end into the speedometer housing on the RIM and ziptied it to stay in place. It's stayed in place for about 100 miles. Could my speedometer cable housing on the rim be the wrong part or did I get the wrong speedo cable?
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Old 07-15-2012, 07:46 PM
Eveready1100 Eveready1100 is offline
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Jeremy, you've been supplied a cable for a standard with both ends having the knurled nuts on them. The specials have the bolt type end to fit onto the speedo drive unit.
Unfortunately, the difference in cables won't alter the speedo reading. Is it the original speedo??
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Old 07-15-2012, 07:46 PM
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You got a cable for a standard. The special cable attaches to the drive on the wheel differently, with a tab and a bolt.

Your speedometer might very well be wrong, jwhughes3 has one thats 15 or 20 MPH slow. When his reads 60 he's doing about 75 or 80
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Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.

― Albert Einstein

80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

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Last edited by BA80; 07-15-2012 at 07:49 PM.
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  #10  
Old 07-15-2012, 07:56 PM
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jwhughes3 jwhughes3 is offline
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I was just about to admit to that

John
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  #11  
Old 07-15-2012, 08:47 PM
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rpgoerlich rpgoerlich is offline
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And the 160mph speedo I got from ya is 15mph fast... It had already been opened up.
Could be a good thing though Eh?!
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  #12  
Old 07-15-2012, 09:01 PM
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Quote:
Originally Posted by rpgoerlich View Post
And the 160mph speedo I got from ya is 15mph fast... It had already been opened up.
Could be a good thing though Eh?!
Hahahaha..........maybe you won't get a speeding ticket next time Richard....ha ha ha ha
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Greg

Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.

― Albert Einstein

80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

The list changes.
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  #13  
Old 07-15-2012, 09:25 PM
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jwhughes3 jwhughes3 is offline
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Well I didnt open it...what can change to make it off so much?

John
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Go ahead, click on the bikes - you know you want to...the electrons are ready.
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Bob Jones Custom Navy bike: Tkat brace, EBC floating rotors & SS lines, ROX pivot risers, Geezer rectifier, new 3H3 engine

"Not all treasure is silver and gold"
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  #14  
Old 07-15-2012, 09:52 PM
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If the needle was removed or replaced it probably got putback on in the wrong position. The needle broke off of mine the other day and without the needle there to hit the stop at 0 it drops quite a ways below.

Sorry about the pic, it is dark and the flash glares.



And this one read abou 5MPH fast before.
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Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.

― Albert Einstein

80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

The list changes.
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  #15  
Old 07-15-2012, 10:19 PM
BobBaldy BobBaldy is offline
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I had a friend with a Ninja whose spedo said 135 when you were only doing 120......
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