: Another tech question

[Randy Grein]

Huh. Well, all I can say then is what Zoran already told you - the  
Speedo unit is connected to the front wheel and has nothing to do  
with the gear ratio. I don't know why your GPS would be giving a  
different reading, but it may have something to do with instrument  
error. Speedometers are supposed to read optimistic by something like  
8%, I have no idea the accuracy of a GPS system. I can tell you that  
in general 5% error is considered very good with normal instruments,  
and that error rates add.

Randy Grein, WMRRA #41

On Oct 28, 2007, at 7:47 PM, Golden Carper [ Bub ] wrote:

>
> ----- Original Message ----- From: "Randy Grein"  
> <randygrein at comcast.net>
> To: "Suzuki SV650 Mailing List" <sv650 at micapeak.com>
> Sent: Sunday, October 28, 2007 10:34 PM
> Subject: Re: : Another tech question
>
>
>> Maybe I understand now - so you checked speed at a given RPM, then  
>> changed gearing and it's now going 10 mph faster at that RPM?  
>> That  would be perfectly normal, but the reading on the speedo  
>> itself  should still be correct.
>> Randy Grein, WMRRA #41
>>
>>>>>> The sproket was changed from 41 teeth to 44 teeth.  Before the  
>>>>>> change when the speedo was showing say 60mph the speed by GPS  
>>>>>> was 55mph, a difference of  5mph. After changing out the  
>>>>>> sproket, now the speedo will show 60mph and the GPS shows  
>>>>>> 50mph.  The 5mph difference I could live with--gave a little  
>>>>>> leeway to stave off the cops.  But 10mph is too much, but I  
>>>>>> may have to live with that also.  Just trying to find a way to  
>>>>>> bring the 2 units [speedo and GPS] closer to agreeing. Put the  
>>>>>> question out on the Strom troopers forum and one member  
>>>>>> directed me to a site that sells units to splice in the  
>>>>>> harness to adjust the speedo. Kinda pricey though, but may  
>>>>>> have to do it.  By the way, I've been using my wife's PC  
>>>>>> that's why you're getting "Margie wrote".
> Golden
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