Produced from 1960 to 1966
Technical and Service Information
The following information is from the Instruction Manual for this model, published by Francis & Barnett Ltd:
| Engine | 20T two-stroke | |
| Cubic Capacity | 199cc (11.8 cu ins) | |
| Stroke | 72mm (2.866 ins) | |
| Bore | 59mm (2.3228 ins) | |
| Rebore Sizes | 0.015" & 0.030" Oversize | |
| Compression Ratio | 8.5 to 1 | |
| Ignition Timing | Points begin to open 5/16"
before TDC |
|
| Contact Breaker Gap | 0.012" | |
| Sparking Plug Type | Lodge CCL 14 | |
| Sparking Plug Gap | 0.018" - 0.022" | |
| Correct Lamp Bulbs | Head - main
Head - pilot Tail Speedo |
6v, 30/24w, twin filament
pre-focus 6v, 3w MBC 6v, 18/3w 6.5v, 0.3amp MBC |
| Carburettor | Amal Monobloc 376/231
Choke bore 1" Main jet 180 Pilot jet 30 Slide No 3½ Needle jet 0.106" Needle position - 2nd notch from top |
|
| Sprockets
(Standard) |
Engine
Clutch Gearbox Rear Wheel |
18T 3/8" pitch
43T 3/8" pitch 18T 1/2" pitch 50T 1/2" pitch |
| Chains | Primary
Final Drive |
3/8" x 1/4" x 0.225", 58 links
1/2" x 0.305", 121 links |
| Rear Chain Adjustment | (Machine on stand) 1¼" whip approx.
(Rider Seated) ½" to ¾" whip. |
|
| Overall Gear Ratios
(Standard) |
4 speed
6.5, 8.6, 12.0, 19.1 to 1 |
|
| Hub Bearings | Front
Rear |
15 x 35 x 11mm
15 x 42 x 13mm |
| Internal Gearbox Ratios | 1.0, 1,3, 1.85, 2.95 to 1 | |
| Engine Main Bearings | Drive Side (2)
Flywheel Side (1) |
3/4" x 1 7/8" x 9/16"
3/4" x 1 7/8" x 9/16" |
| Engine Big End Bearings | Steel Rollers (8) | 1/4" x 3/8" |
| Steering Head Bearings | 1/4" balls - 19 top , 19 bottom | |
| Wheel Rims | WM2 - 18 front & rear | |
| Tyres | 3.25 x 18 L/W front & rear | |
| Tyre Pressures
(Normal Solo) |
Front
Rear |
16 lbs/sq in
24 lbs/sq in |
| Spokes | Front R/H
Front L/H Rear |
10 swg x 6 3/4" (18)
10 swg x 6 5/8" (18) 10 swg x 6 9/16" (36) |
| Brake Drum Diameters | 5" front & rear | |
| Brake Lining Width | 3/4" | |
| Total Braking Area | 13 sq ins | |
| Fuel Tank Capacity | 3¼ gallons | |
| Fuel Mixture | Petrol/oil ratio 20 : 1 (see below *) | |
| Oil Capacities: | Chaincase - fill to drain plug level
Gearbox - fill to level screw behind K/S crank Forks - per leg |
175cc
1 litre 55cc (one petroil filler cap measure) |
| Wheelbase - static | 49¾" | |
| Seat Height | 30½" | |
| Ground Clearance | 6" | |
| Width Over Bars | 26" | |
| Overall Length | 78" | |
| Approx. Weight | 267 lbs |
* - Editor's Note: In the manual, a petroil ratio of 16:1 is recommended for Castrol and "MobilMix TT" 2-stroke oils. However, modern semi-synthetic 2-stroke oils can run at higher ratios (where in accordance with the manufacturer's instructions), and will produce less pollution and carbon build-up.
From an archive of www.users.zetnet.co.uk/Francis_Barnett/ For more information on this page visit Emu Archives
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