1:4 = Honda CB750's and other large cc Japanese bikes, 1:5 = most Kawasaki's and Yamaha’s, 1:7 = most pre-1980 Honda CB's up to 550cc and other small cc Japanese bikes. To confirm, you’ll need to carry out a thorough internet search. Alternatively, you can turn the engine over slowly by hand, counting the number of times the cable rotates for each revolution of the engine.