Probably 2.2-1 you can work it out if the drive is off or you can take the top off & count the teeth on the gears & work it out that way
If your stuck I can look up the no of teeth for the various ratios for you
The worst way you can turn the engine over one revolution and see how far the shaft has gone round, then work it out from there. If it's a bit less than half a revolution then it will be a 2.2:1