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General| Displacement | 248cc |
|---|---|
| Compression Ratio | 6.5:1 |
| Ignition | Magneto |
| Frame Type | Spring frame |
| Suspension Front | Telescopic forks |
| Suspension Rear | Rigid |
| Brakes Front | Drum |
| Brakes Rear | Drum |
| Engine Type | Single cylinder, overhead valve (OHV) |
| Transmission | 4-speed |
| Top Speed | 70 mph |
| Wheelbase | 1350 mm |
| Weight | 137 kg (302 lbs) |
| Fuel Capacity | 3.5 gallons |
Detailed description of the 248cc vertical single four-stroke engine.
Overview of the 6-volt battery, AC alternator, and rectifier system.
Mentions Amal Type 274/BS/3A or 375/10, referencing other sections.
Detailed explanation of the dry-sump lubrication system.
Description of the four-speed, constant-mesh gearbox.
Details of the three-plate clutch with cork inserts.
Procedure for checking and setting valve timing marks.
Method for adjusting tappet clearances when the engine is cold.
Details on setting ignition timing using automatic advance.
Steps for removing the cylinder head assembly.
Step-by-step guide for removing the engine from the motorcycle frame.
Procedure for separating the crankcase halves.
Detailed steps for dismantling the gearbox.
Steps for removing and reassembling the clutch.
How to adjust the clutch cable and control.
Explanation of carburettor operation and identification of parts.
Practical advice for carburettor tuning.
Guide to diagnosing carburettor mixture richness or weakness.
Identification of parts used for carburettor tuning.
Step-by-step procedure for tuning Amal needle jet carburetters.
Practical advice for Amal Monobloc carburettors.
Explanation of Monobloc carburettor operation and part identification.
Advice for starting, cable controls, and petrol feed for Monobloc.
Guide to diagnosing Monobloc carburettor mixture issues.
Identification of parts for tuning Monobloc carburetters.
Overview of the Miller AC generator, rectifier, and battery charging system.
Explanation of the different positions on the lighting and ignition switch.
Reference to wiring diagram and explanation of circuits.
Procedure for setting ignition timing with automatic advance.
Troubleshooting guide for charging system faults.
Overview of the Lucas AC lighting-ignition system components.
Details of the RM13 alternator, its construction and function.
Explanation of the alternator stator and coil connections.
Lubrication and cleaning of the contact breaker unit.
Procedure for checking and adjusting the contact breaker gap.
Description of the "dry charged" PUZ7E battery.
Instructions for filling the battery with electrolyte.
Regular checks for electrolyte level and cleaning.
Description of the "dry charged" PUZ5E battery.
Instructions for preparing the battery for use.
Regular maintenance of the battery.
General description of the frame construction and features.
Description of the telescopic front fork.
Steps for dismantling the fork for servicing.
Steps to remove the front wheel from the fork.
Overview of rear wheel types and features.
How to remove the inner tube with the wheel fitted.
Steps for removing the rear wheel from the frame.
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