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83 Suzuki GS750ES speedo reads low

charlie27

Forum Apprentice
Hi picked this bike up last year and just did normal maintenance
It seems the speedo reads low
70mph at 7k rpm in 5th
Any ideas what to check?
Thanks
 
Hi picked this bike up last year and just did normal maintenance
It seems the speedo reads low
70mph at 7k rpm in 5th
Any ideas what to check?
Thanks
I don't know what to do to fix it, but have you verified that your gauge is reading low. I found out a few weeks ago why the cops haven't been pulling me over. My gauge on my '82 1100E reads 40 when a "your speed" road sign said I was only going 32. I know the sign was correct, because I went by it a week ago in our '16 Altima an it was spot on with the cars speedo.
 
On my 83 750e the bike runs at 55 according to speedo and radar sign, while tach sits at 4K exactly.
100/90/16 front tire up one size from stock and stock gearing
 
Best: Get a gps and a straight long road. OR use the odometer and a watch. The odometer is far more reliable than the speedo, being gear driven. PLUS the odometer can be tested by riding a distance from a map.
ADD: the tires' diameter can slightly affect accuracy of all except the gps.

You can't trust the tach to calibrate the speedo.
 
Last edited:
Best: Get a gps and a straight long road. OR use the odometer and a watch. The odometer is far more reliable than the speedo, being gear driven. PLUS the odometer can be tested by riding a distance from a map.
ADD: the tires' diameter can slightly affect accuracy of all except the gps.

You can't trust the tach to calibrate the speedo.

Lucky if the tach still works....
 
GPS works great. All my bikes other than my Gold Wing read 10% fast. Not uncommon. Verified by GPS, "you are driving" signs and no tickets...
 
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