A Guide to Motor-Cycle Design - A Collection of Vintage Articles on Motor Cycle Construction
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A Guide to Motor-Cycle Design - A Collection of Vintage Articles on Motor Cycle Construction - Read Books Ltd.
A GUIDE TO
MOTOR CYCLE DESIGN
A COLLECTION OF
VINTAGE ARTICLES ON
MOTOR CYCLE CONSTRUCTION
By
VARIOUS AUTHORS
Copyright © 2022 Read & Co. Books
This edition is published by Read & Co. Books,
an imprint of Read & Co.
This book is copyright and may not be reproduced or copied in any
way without the express permission of the publisher in writing.
British Library Cataloguing-in-Publication Data
A catalogue record for this book is available
from the British Library.
Read & Co. is part of Read Books Ltd.
For more information visit
www.readandcobooks.co.uk
Contents
WHY THE CRANK CASE GETS HOT
A MAGNETO DIFFICULTY
ELEVEN YEARS OF MOTOR CYCLE DEVELOPMENT
A CONTRAST IN MOTOR CYCLES
3 1/2-H.P. TWINS
A TRYING EXPERIENCE ON THE ROAD
THE CAUSE OF THE TROUBLE
THE LEA-FRANCIS TWO-SPEED GEAR
THE REAR LIGHT QUESTION
BENZOLE AND EXHAUST VALVE DESTRUCTION
TWO-STROKE ENGINES AND AIR COOLING
WHY THE ENGINE WOULD NOT START
THE TWO-SPEED GEAR MECHANISM OF THE CLYNO
TWO-STROKE MOTOR CYCLE
A LOOSE TANK CAUSES AN ACCIDENT
SOME SILENCER EXPERIMENTS AND THEIR OBJECTS
A NOTE TO CORRESPONDENTS
TROUBLE AFTER RE-BUSHING
LOW-TENSION MAGNETOS
WHAT IS THE LOW-TENSION SYSTEM?
FAULTY BRAKE APPLIANCES
ADJUSTING THE ARMSTRONG GEAR
MOTOR CYCLES THAT ARE TOO FAST
A SMASH AND THE SEQUEL
FRAMES THAT ARE OUT OF LINE
A NOVEL CONNECTING-ROD
PROTECTING IRON PATTERNS
THE ULTRA-LIGHTWEIGHT MOTOR CYCLE
MOTOR CYCLE REPAIRS
TWO-STROKES AND CARBURATION
TROUBLE WITH A BROKEN VALVE
STRANGE BEHAVIOUR OF A BELT
FITTING A NEW PISTON RING
REAR LIGHTING FROM THE MAGNETO
AN OFFICER’S BELT EXPERIENCE
A TWO-STROKE QUERY
SIDE CAR ALIGNMENT
AN EXHAUST LIFTER DIFFICULTY
INTERRUPTED IGNITION
COUNTERSHAFT GEAR ADVANTAGES
DANGER WITH SIDE CARS AT CORNERS
A READER’S LAMP ENQUIRY
BELT WEAR ON EXPANDING PULLEY GEARS
A QUERY RELATING TO TWO-STROKE WORKING
MAKING AN ARMATURE FOR A MAGNETO
A HINT TO USERS OF SMALL TYRES
THE CAUSE OF A PETROL STOPPAGE
GETTING THE LAST DROP OF PETROL
A QUERY RESPECTING MOTOR CYCLE LICENSING
INACCESSIBLE MOTOR CYCLE PARTS
A RECENT HEADLIGHT DECISION
DAMAGE TO A PISTON
HOT INDUCTION PIPE
A NEW MOTOR CYCLE RECORD
A MOTOR CYCLE LIGHTING
CASE AND ITS SEQUEL
THE LAMP AND ITS FIXINGS
THE SUMMONS AND THE HEARING
NEW TWO-STROKE ENGINE DESIGNS
SHIFTING CARBURETTOR LEVERS
THE ADVANTAGE OF SPRING FOOTBOARDS
A NEW MOTOR PROPELLED BICYCLE
MY RECENT LIGHTING
CASE
These articles have been extracted
and compiled from various editions of
The Model Engineer and Electrician.
A GUIDE TO
MOTOR CYCLE DESIGN
WHY THE CRANK CASE GETS HOT
The motor cyclist is often puzzled to know why the crankcase of his engine gets so hot, a condition which is almost certainly accompanied by a falling off in power and speed. I have at various times received enquiries from readers complaining of these symptoms and in one case, a novice rider told me that he contemplated either removing the drain plug or else drilling a hole in the top of the crankcase to allow of the heated air escaping.
Fortunately, I was in time to prevent him from doing considerable injury to his engine by adopting either of these plans.
A hot crankcase—that is, one which gets unusually warm—indicates that the piston rings are in a faulty condition, and that, owing to their lack of fit
in the cylinder, gas is leaking past them into the crank chamber. This results not only in conveying heat to the latter, but also in loss of power, and the remedy is to fit new rings. On inspection they will most likely be found to bear marks of discolouration, which is a sure sign that leakage is taking place.
Sometimes, if the rings are removed from the piston and the grooves cleaned out, the inside of the rings themselves being also scraped clear of burnt deposits, some further use may be made of them, but as a general rule it is better to fit new ones If the cylinder has had a very great amount of wear it may be necessary to have it re-bored, so as to restore its true cylindrical interior shape, and then a new piston altogether will be required.
A MAGNETO DIFFICULTY
A Weymouth reader, who possesses a motor bicycle fitted with U.H. magneto, writes, asking my advice in the following circumstances: I experienced during a recent ride,
he says, "a most peculiar action on the part of the magneto. So long as the timing lever was in the fully advanced position or any position between that and, say, two-thirds retarded, all was well. Movement of the lever further than this, however, in the direction of retard immediately brought about misfiring, whilst fully retarding it was to stop the engine firing altogether.
"It is a low-powered machine, and I find it necessary to fully retard the ignition when climbing a stiff hill, but as the effect of this was to stop the engine, I was obliged to desist, and knocking and labouring of the engine resulted.
On one long down grade I used the timing lever as a switch, cutting off the current to the sparking plug by fully retarding the lever.
My view of the matter is that the contact breaker points required adjusting. In the U.H. magneto this can only be done with the parts in situ and a special spanner is provided for the purpose. This appliance was illustrated some time back in these pages.
Immediately at the rear of the contact disc is a rotatable washer or plate, moved by means of the special spanner referred to. If this plate be turned to the right the effect is to reduce the amount of break
and to retard the moment of sparking, whilst if, on the other hand, it be turned to the left, the