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Author Topic: Speedo Ratio  (Read 789 times)

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Offline bunghole

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Speedo Ratio
« on: October 17, 2008, 09:39:44 PM »
I did a search and someone mentioned using the 2240:60 ratio for 750s, but I think that is for a 21" wheel and my '77 750K has a 19" wheel.  Do I use the 4:1 ratio?

Thanks!
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'05 HD FLSTCI (Heritage)
'06 Suzuki DRZ400S
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Re: Speedo Ratio
« Reply #1 on: October 18, 2008, 03:38:13 AM »
Like I tell my students "Do the math. I can't"  ;D
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Offline Steve F

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Re: Speedo Ratio
« Reply #2 on: October 18, 2008, 04:02:04 AM »
The way I understand it is:
the Speedo is 2240 rpm on the input shaft = 60MPH registered
The tachometer is designated as "4:1"  in other words, 2000 rpm on the input shaft should register 500 rpm on the face.
Someone correct me if I'm wrong here.
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