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Speedo Question 1980 GS850G

marvinsc

marvinsc

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I changed out a Broken Speedo Cable Today on My 850. From the Looks of it, I'm Guessing that the old One was the Original.(23,050 Miles) I had not payed a Lot of attention before to the RPM vs Indicated Speed Before the Cable Broke. I took Her on a 40 Mile Ride and Here are the RPM vs Speedo Readings on Smooth Level Road in 5th Gear. 3000rpm = 42 mph indicated, 4000 rpm = 57 mph indicated 5000 rpm = 72 mph and 6000 rpm = 82 mph

Anything above 6000 rpm = Unknown due to 85 mph Speedometer!:)

I was just wondering if these Readings are within a Reasonable Margin of Error based on other Peoples experience. Thanks!
 
I'm Bumping this before Turn in. Come on, Don, Ray, Lynn, Mark I Know Some of You 850 Guys are Out There!:-D
 
That sounds about right for my '80 GS850G with 37k and I ALSO just replaced the original speedo cable!
 
The speedo cable on my 850 isn't the problem. I found it in the unit on the wheel. I got this guy who is going to sell me a unit and a cable from a GS550. I am a little worried the rim size or something like that being an issue. Anybody know if this will work.

Justin
 
I sure wish I had your speedometer drive gear! Your indicated speeds are right on the actual speeds for my 850. I figure 14 MPH per 1,000 RPM in top gear, and that's what your speedometer is showing.
 
Speed vs RPM

Speed vs RPM

All your numbers are right in the same range as mine. I have a 1980 850G that is stock except for a KN replacement air filter in the stock air box. I noticed after balancing my carbs I picked up about four mph is 5th gear at the same rpm.
 
Yes, these numbers are the same as mine as well. I cannot speak for about 60 as I have not went there.
 
Thanks Guys! I'm Heading to the Airport, Catch You Next Week!:-D
 
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