Question:
Has anyone used the Joker tach plug on a 550 engine?
On their site, it is known to fit:
CB350F - 1972 - 1974
CB400F Super Sport - 1975 - 1977
CX500 - 1978-1979
CX500C Custom - 1979-1982
CX500D Deluxe - 1979-1981
CB750F Super Sport - 1975-1976
CB750K - 1969-1976
[But "unknown" as to the 550 on their site.]