MO Series

M Series Magneto – All B and M Group. For dynamo parts click here. The points end bearing changed from 35 to 37 mm outside diameter in 1940 and the diameter of the earth brush was reduced in 1955 from 6 to 5 mm. These magnetos could have the pick up on the left or right and the advance and retard cable could also be on the left or right (all viewed from the drive end). If the advance and retard cable enters on the right the ignition will be advanced when the cable is slack and vice-versa for a left hand cable. The pick up was always on the left but the advance and retard cable changed from the left to the right side in 1955. They are all described as anti-clockwise magnetos which refers to the direction of rotation again from the drive end.
All parts fit all years of all MO series magnetos from 1936 unless stated otherwise.

Part Number

Description

Models

Years

110730

Points carrier screw

149010/10

Armature shim to reduce end float .010″

149010/5

Armature shim to reduce end float .005″

173974

Sprocket sleeve nut

185015

HT lead split copper washer

189289

Bearing, magneto, 13×30 mm MO Old

189291

Bearing, magneto, points end, 35mm O.D. MO 1940-62

189294

Bearing, magneto, points end, 37mm O.D. MO 1938-39

189294

Bearing, magneto, drive end, 37mm O.D.

200569

Nut dynamo to magneto

410600

Acorn nuts for pickups etc (holds HT leads)(see 421554 & 185015)

451260

Brush for magneto pickups

451323

Earth brush, 6mm diameter for 460,380 1936-54

451378

Bearing insulating washer for 189289 bearing, 30mm

451379

Bearing insulating washer for 189291 bearing, 35mm

454495

Gear for dynamo, 22T

454496

Slip ring MO1/MSL1

454694

Screw, stepped, end cover fixing

455190

Earth brush, 5 mm diameter for 455,191 1955-58

455191

Earth brush holder, small, use brush 455,190 1955-58

455361

Slip ring MSHV some MN2/MNV

455622

Pick-up gasket MO, MN

458268

Plunger for advance and retard cable

458658

HT lead rubber boot MO, MN

459005

Bearing insulating washer for 189244 bearing, 40mm

460051

Contact breaker assembly

460052

Points screw lockwasher

460053

Drive end cover gasket

460055

Dynamo strap trunnion (2 per)

460056

Dynamo strap

460056S

Dynamo strap screw (2 per)

460061

Points cover in steel

460380

Earth brush holder for 451,323 brush (6 mm) 1936-54

461435

Fibre gear, 58 teeth, narrow

463066

HT pickup

463075/10

Armature shim to increase end float, .010″

463075/3

Armature shim to increase end float, .003″

463075/5

Armature shim to increase end float, .005″

463109

Fibre gear, 58 teeth, wide

463112

Slipping clutch friction disc

463113

Slipping clutch nut lockwasher

463117

Slipping clutch centre nut

463334

This is the Lucas number for their kit of ‘sundry parts’. This was the only way to obtain the small fastenings. We supply these parts as individual items using a suffix letter for each one.

463334A

Stepped stud for contact breaker plate

463334B

Earth wire holder with grub screw

463334C

Pick up retaining screw

463334D

Drive end cover screw

463867

Dowel for magneto base to crankcase

463898

Points cover pillar and spring clip retainer for L/H advance/retard

463899

Points cover pillar and spring clip retainer for R/H advance/retard

463932

Bearing insulating washer for 189294 bearing, 37mm

463989

Drive end cover

464092

Nylon tappet, operates the contacts

484098

Contact set

493180

Points cam, clockwise

493181

Points cam, anti-clockwise MO1

A18-91

Tool for locking slipping drive

A62-91

Magneto identification label

A62-92

Magneto identification label, comp models (in red)

MAG4

Overhauled armature and new condenser EXCHANGE MO1

MAG3

Overhauled armature and new condenser EXCHANGE MN

MAG5

Overhauled armature and new condenser EXCHANGE MS1

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