Hi
This set of what looks like 0.010 oversize 1954 KHRM cylinders came with the 55 KHK I just bought...
Factory milled to clear the huge Wico vertical magneto they used in 1953 and 1954.
rear cylinder:
front cylinder:
The Fairbanks Morse was introduced, both vertical (KHRM) and horizontal (KR and KRTT) in 1955...
Patrick