Topic: what is ratio for speedometer 1980 cb650

[martino1972]

Does anybody know the ratio for the speedometer on a cb650 from 1980...
Been looking at those mini speedometers to place right by the front axle so that I can rip the cockpit of my bike for a clean shaven look......

[CBJoe]

Cant remember, but I think you can turn the crank by hand and count the revolutions at the cable end.

Regardless  ..... you should post it for the rest of us poor souls who'd like to do the same thing someday  .

Joe

[d3buttz]

i believe(dont take my word for it) its 1:4 just like the cb750.  hope this helps

[martino1972]

Cant remember, but I think you can turn the crank by hand and count the revolutions at the cable end.

Regardless  ..... you should post it for the rest of us poor souls who'd like to do the same thing someday  .

Joe

if I crank the engine the tach will move but don't help much for the speedometer....
my tach will be eliminated.......the screaming of the engine will tell me if I'm red lining it or not...

[martino1972]

i believe(dont take my word for it) its 1:4 just like the cb750.  hope this helps

that would be sweet,cause iv'e seen a nice one at cycle x,but it's for a 750....now i do have a 750,would the little thing by the front axle fit the 650...??

[eurban]

750's speedometer ratio is 2240:60 like earlier Harley's.  Most Japanese bikes of our era use this ratio so I would be surprised if it is not the same on the 650 . . .

[CBJoe]

Cant remember, but I think you can turn the crank by hand and count the revolutions at the cable end.

Regardjavascript:void(0);less  ..... you should post it for the rest of us poor souls who'd like to do the same thing someday  .

Joe

if I crank the engine the tach will move but don't help much for the speedometer....
my tach will be eliminated.......the screaming of the engine will tell me if I'm red lining it or not...

Doh        I never did could read good

[martino1972]

750's speedometer ratio is 2240:60 like earlier Harley's.  Most Japanese bikes of our era use this ratio so I would be surprised if it is not the same on the 650 . . .

see,problem is,if it does turn out to be different then I spend 34 bucks plus shipping....money i can spend for beer..

then again,it's just to keep it legal,i will never look at it to see how fast im going,cause its right by the wheel...

[razor02097]

All older japan bikes that have a cable driven speedometer running off of the front wheel have the same reading.  The only thing you match is the speedometer drive to the wheel you are running.  I believe its like 2250 RPM= 60MPH or something like that.

Cable driven tachometers are what have the different ratio of 1:4 or 1:5