Norton-600

Norton

The difference between the N1 and N3 is the shank diameter, where it fits into the flywheels. Both N1 and N3 are not drilled. The N2 bearing is identical to N1 but does have oil way drilling. The Alpha Bearing design of replacement big end has been particularly successful and is supplied with castlelated nuts. The size of these nuts depends on if the bearing is to fit 350cc or 500cc wheels. Please specify when ordering.

350cc

Year	Model	Con rod casting No.	Big end Part No.	Cage Part No	Small end Part No.	MAIN BEARINGS
Year	Model	Con rod casting No.	Big end Part No.	Cage Part No	Small end Part No.	Drive Side		Timing Side
-––	O.H.V. models	––	––	––	––	––		––
1933-63	50	E8852	N3	––	SE51	LS10	RL10L	RL10L
-––	O.H.C. models	––	––	––	––	––		––
1929-30		E2075	N2	––	––	––		––
1931-32	CJ, JE		N2	––	SE51	––		––
1932-52	International, 40		N5/IS	K28	SE51	LS11	RLS11	MS10
1933	CJ	7280X86	N5/IS	K28	SE51	––		––
1964-66	50 Mk2	––	AMC20	K51	SE1	MS10	LS10	RL10L	030184
1946-59	40, Manx	––	N5M	K80	SE139	§		§
1960-63	40 Manx¹³	––	N6	K81	SE139	§		§

500cc

Year	Model	Con rod casting No.	Big end Part No.	Cage Part No	Small end Part No.	MAIN BEARINGS
Year	Model	Con rod casting No.	Big end Part No.	Cage Part No	Small end Part No.	Drive Side		Timing Side
-––	Side Valve Machines	––	––	––	––	––		––
1925-30	16H, 2	––	N1	––	SE52	––		––
1931-33	16H	––	N1	––	SE51	––		––
1933-55	16H, WD	––	N3	––	SE51	––		––
1948-52	16H	E4101	N3	––	SE51	LS10	RL10L	RL10L
––	O.H.V. Machines	––	––	––	––	––		––
1922-28	18, 21, 25, 34	––	N1	––	SE52	––		––
1928-30	ES2, 18, 20	––	N1	––	SE52	––		––
1931-33	18, 20, ES2	––	N1	––	SE51	––		––
1934-63	ES2,18, 20	E4099	N3	––	SE51	LS10	RL10L	RL10L
1964-66	ES2 Mk2	––	AMC20	K51	SE1	MS10	LS10	RL10L	030184
––	O.H.C. Machines	––	––	––	––	––		––
1928-30		––	N2	––	––	––		––
1935-55	30, International	––	N5IL	K29	SE54	LS10	RL10L	RL10L
1946-59	30, Manx¹⁴	––	N5M	K30	SE139	MS10	LS10	RL10L	030184
1960-63	30 Manx¹⁴	––	N6	K81	SE139	––	––	––

¹⁴ Please specify 350cc to ensure you receive the correct nuts.

¹⁴ Please specify 500cc to ensure you receive the correct nuts.

588cc

Year	Model	Con rod casting No.	Big end Part No.	Cage Part No	Small end Part No.	MAIN BEARINGS
						Drive Side	Timing Side
-––	Side Valve Machines	––	––	––	––	––	––
1926-30	19	––	N1	––	SE52	––	––
1931-32	19	––	N1	––	SE51	––	––

500cc, 600cc & 650cc Twins

Year	Model	Big end shell	Big end Std size		MAIN BEARINGS
––	––	No.	From	To	Drive Side	Timing Side
1949-66	Dominator, 77,88 & Manxman	B2025M	1.5000"	1.5005"	R330L	330
1949-69	650SS	(17828)	––	––	––	––

Norton 600cc & over

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