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

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

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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