Instruction manual

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Gear ratios (models 16MCS and 18CS)

Engine sprocket size

15 teeth

16 teeth *

17 teeth

18 teeth †

19 teeth

20 teeth

21 teeth

First gear

18·69 to 1

17·5 to 1

16·44 to 1

15·57 to 1

14·6 to 1

14·01 to 1

13·35 to 1

Second gear

11·83 to 1

11·08 to

10·41 to 1

9·85 to 1

9·27 to 1

8·87 to 1

8·45 to 1

Third gear

8·75 to 1

8·2 to 1

7·7 to 1

7·28 to 1

6·86 to 1

6·56 to 1

6·25 to 1

Fourth gear

(top)

7 to 1

6·56 to 1

6·16 to

5·83 to 1

5·49 to 1

5·25 to 1

5.0 to 1

Part

number

014015

014016

014017

014018

014019

014020

014021

* standard Solo sprocket for Model 16MCS.

† standard Solo sprocket for Model 18CS.

Ignition (magneto)

Model

16M-16MS-18

18S

16MC-18C

16MCS-18CS

Make

Lucas

Type

N1-4

NR1

Rotation

Anti-clock

Point gap

·012 in.

Ignition point before top

dead centre (with control

in fully advanced position)

in.

(39°)

in.

(39°)

Ignition (sparking plug)

Model

All

Make

K.L.G.

Type

FE80

Thread

14 mm.

Reach

¾ in.

Point gap

·015 to ·018 in.

Lighting (dynamo)

Make

Lucas

Type

E3-N

Voltage

Rotation

Anti-clock

Part number

20028-A

Lighting (bulbs)

Location

Head lamp (Pre-focus)

Pilot

Rear lamp

Speedometer

Type

Double filament

Single contact

Voltage

Wattage

30X24

1·8

Cap

Special

M.B.C.

Part

number

312

988

53205

Oversize parts

The following are the only " oversize " variations provided for the 350 and 500 c.c. Single Cylinder machines.

Big-end rollers :

·001 in. oversize

Cylinder re-bore :

·020 in. and ·040 in. oversize

Pistons and rings :

·020 in. and ·040 in. oversize

Pistons

Model

350

500

Top of skirt diameter

2·7176 in.

3·2490 in.

Bottom of skirt diameter

2·7180 in.

3·2494 in.

Part number

013504

013505

All above measurements are subject to a toleration limit of + or — ·0005 in.

Piston rings

Piston ring gap—Normal

Permissible maximum

Piston ring clearance in groove

·006 in.

·030 in.

·002 i n.

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