Motorcycle Repair: speedometer ratio 77cb750f, cb750f, speedometer

Question
i'm looking to buy a new speedo for a 77 cb750f and need to know the ratio, it has a 1.85x19 wheel with a 130/90/19 tire any help is appreciated

Answer
Greg, I don't know the ratio but it's easy to figure out.  Jack the front of the bike up to get front wheel off the ground.  Then slowly turn the wheel and count the revolutions of the cable.  You may want to turn it ten times and then divide the number of times the cable turns by ten so you get the wheel to cable ratio.

Regards
Rich