I have a 1984 suzuki rm125 that has that same motor in it. Your motor is a 1984 suzuki rm125. i just verified it with suzuki. the f108 also came in the 1985 rm125 bikes but had a higher number.
2003
1994 SUZUKI RM125
1999 SUZUKI RM125
2000
2004
1996 SUZUKI RM125
1998
610ml
sorry not a 2007. the f114 only came in one bike.... 1989 suzuki rm125 the 1988 rm125 motor number was f113
the f108 motor came in 2 bikes 1984 and 1985 rm125 since your motor number is low yours is a 1984 suzuki rm125
.55 mm