AIGOR.ORG
 |
Motorcycle
Carburettor Tuning Guide
for PHM, PHF, PHBE, PHBH, PHBL, PHBG |
A
GUIDE TO THE CHOICE, SETTING AND USE OF TAPERED NEEDLE
MOTORCYCLE CARBURETTORS
AIGOR.ORG
|
Motorcycle
Carburettor Tuning Guide
for PHM, PHF, PHBE, PHBH, PHBL, PHBG |
A
GUIDE TO THE CHOICE, SETTING AND USE OF TAPERED NEEDLE
MOTORCYCLE CARBURETTORS
|
TABLE
OF CONTENTS
|
|
|
1.0
|
FUNCTIONS OF THE CARBURETTOR |
|
2.0
|
FEATURES |
|
2.1
|
Carburettor diagram and principal parts |
|
2.2
|
Operating ranges |
|
2.3
|
Installation angles |
|
2.4
|
Engine connections |
|
2.5
|
Air Intakes |
|
2.6
|
Construction materials |
|
3.0
|
OPERATION, SELECTION OF CORRECT PARTS, TUNING AND USE |
|
3.1
|
The venturi effect |
|
3.1.1
|
Selection of the correct carburettor size |
|
3.2
|
Fuel supply system |
|
3.2.1
|
Selection of the needle valve size |
|
3.2.2
|
Selection of the float |
|
3.3
|
Starting from cold |
|
3.3.1
|
Independent starting circuit |
|
3.3.2
|
Selection of starter emulsion tube and starter jet |
|
3.3.3
|
The flooding plunger starting device |
|
3.4
|
Idle systems |
|
3.4.1
|
Setting the idle with a mixture adjusting-screw |
|
3.4.2
|
Setting the idle with an air adjusting-screw |
|
3.4.3
|
Selection of the correct size of idle jet |
|
3.5
|
Progression system |
|
3.6
|
Full throttle operation |
|
3.6.1
|
Full throttle system as usually used on two-stroke engines |
|
3.6.2
|
Full throttle system as usually used on four-stroke engines |
|
3.6.3
|
Selection of the throttle valve cutaway |
|
3.6.4
|
Selection of the tapered needle |
|
3.6.5
|
Selection of the correct size main jet |
|
3.7
|
Acceleration mechanism |
|
3.7.1
|
Diaphragm accelerator pump |
|
3.7.2
|
Selection of correct pump cam and pump jet |
|
3.7.3
|
Piston type accelerator pump |
|
4.0
|
MULTI-CYLINDER ENGINES |
|
4.1
|
Idle tuning and adjustment |
|
5.0
|
FACTORS WHICH CAN ALSO AFFECT THE CARBURATION |
|
5.1
|
Changes of fuel |
|
5.2
|
Changes in atmospheric pressure and air temperature |