JAP Motorcycles

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This page is archived (with minor modification) from the original site by Martin Schenker

Identify a JAP engine


Side valves (SV) :
V	175 cc. 60 x 62 mm.	U	600 cc. 85,7 x 104 mm.
Z	175 cc. 55 x 73 mm.	GT	680 cc. v-twin 50deg 70 x 88 mm.
N	200 cc. 55 x 83 mm.	MT	750 cc. v-twin 50deg 70 x 97 mm.
B	250 cc. 64,5 x 76 mm.	KT	980 cc. v-twin 50deg 85,7 x 85 mm.
A	300 cc. 70 x 78 mm.	KTCY	980 cc.(8/30) v-twin 50deg 85,7 x 85 mm.
I	350 cc. 70 x 90 mm.	LT	1100 cc. v-twin 60deg 85,7 x 95 mm.
K(Y)	500 cc. 85,7 x 85 mm.	DT	1323 cc. v-twin 60deg 90 x 104 mm.
L(Y)	550 cc. 85,7 x 95 mm.


Over head valves (OHV):
HO	175 cc. 53 x 78 mm.	KOC	500 cc. sports 85,7 x 85 mm.
TO	200 cc. 57 x 78 mm.	KOR	500 cc. racing 85,5 x 85 mm.
PO	250 cc. 62,5 x 80 mm.	JOR	500 cc. racing 80 x 99 mm.
POR	250 cc. racing 62,5 x 88 mm.	PTOR	500 cc. racing v-twin 62,5 x 80 mm.
NOR	250 cc. racing 65,5 x 74 mm.	GTO	680 cc. racing v-twin 70 x 88 mm.
BOR	250 cc. TT racing 64,5 x 76 mm.	KTOR	980 cc. racing v-twin (8/45) 85,7 x 85 mm.
SOC	350 cc. sports 74 x 80 mm.	KTO	980 cc. (8/45) v-twin 62,5 x 80 mm.
SOR	350 cc. racing 70 x 80 mm.	JTOR	998 cc. racing v-twin (8/50) 80 x 99 mm.
IOR	350 cc. racing 70 x 90 mm.	JTO	998 cc. touring v-twin 80 x 99 mm.
SOS	350 cc. grass track 74 x 80 mm.	JTOS	998 cc. sprint v-twin (8/80) 80 x 99 mm.
JOS	500 cc. 80 x 99 mm.	W/W	1100 cc. racing v-twin ? x ? mm.
YTO	500 cc. v-twin 60 x 88 mm.


Production date:
1920	1921	1922	1923	1924	1925	1926	1927	1928	1929
P	N	E	U	M	A	T	I	C	S


1930	1931	1932	1933	1934	1935	1936	1937	1938	1939
W	H	Y	Z	D	R	V	F	O	G


As an example: An engine with the letters KY/C on the crankcase is a 500 ccm sv, built in 1928 Two-stroke JAP numbers include F2UH, a 3 speed unit-construction single with iron barrel and head. This page was copied and converted to english from the Danmarks Veteran Motorcykleklub. There is another very useful page with similar information on JAP Engine Numbers at http://www.donaldantiquerototillers.com/JAPEngineChart.htm Another source of JAP serial numbers: http://210277.homepagemodules.de/ The original version of this page saved from http://web.archive.org/web/20041010132218/http://www.mpimg-berlin-dahlem.mpg.de/~schenker/jap.htm

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