new generation in-line 4 cylinder engines transversely mounted across the frame
R2V
boxer twins with 2 valves per cylinder (1995-1996), also known as “airheads”
R4V
boxer twins with 4 valves per cylinder (1994-current), also known as “oilheads”
K2V
K series with 2 valves per cylinder (1983-1989)
K4V
K series engines with 4 valves per cylinder (1989-2004) also known as “flat” or “brick” engines
K4V Transverse Engine
F Single
single cylinder F series models (F650 etc)
F Twins
new generation parallel twin cylinder models (F650/800)
70>80
models manufactured from 1970 up to 1980
81>
models manufactured from 1981 on onwards
>90
models manufactured up to 1990
Mono
RV2 models manufactured from 1984> with single shock absorbers. also known as “mono shock” or “monos”
Twin Shock
RV2 models with twin shock absorbers manufactured from 70>84
OE
original equipment
OEM
original equipment manufacturer