[MX67]

More information needed. But here's ratios, You'll know what are yours

1200
4,37 r&p; 1st 3,78; 2nd 2,06; 3rd 1,26; 4th 0,89
1300
same as 1200
1500
same as 1200 but r&p 4,12
1600
same as 1200, but r&p 3,88 and 0,92 fourth gear