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

new generation in-line 4 cylinder engines transversely mounted across the frame

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