60C5D11
1-16
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Technical tips
1
Carburetor
Prime start
To facilitate the starting of a cold engine, an air-fuel mixture that is richer than normal is required.
For this reason, the Prime Start system has been adopted in the F100B and F100C. In the Prime
Start system, the thermo heater plunger is in a position that fully opens the fuel enrichment valve
while the engine is being started. Thus, fuel enrichment is achieved during the starting of the
engine, and continues while the engine is being warmed up. Once the engine is started, a signal is
sent from the pulser coil to the CDI, and from the CDI to the Prime Start to allow the wax to expand.
The expanded wax moves the thermo heater plunger in the direction to close the enrichment valve.
As a result, the volume of fuel that passes through the fuel enrichment valve decreases. A few min-
utes after the engine has started, the thermo heater plunger completely closes the fuel enrichment
valve, thus ending the fuel enrichment by the Prime Start system.
1
Prime Start
2
Carburetor #1/#3
3
Carburetor #2/#4
4
Fuel enrichment valve
5
Thermo heater plunger
È
Air
É
Fuel
Ê
Air-fuel mixture
Features and benefits
Содержание F100B
Страница 1: ...SERVICE MANUAL 60C 28197 5D 11 290429 F100B F100C ...
Страница 52: ...SPEC Specifications 2 17 60C5D11 MEMO ...
Страница 162: ...LOWR Lower unit 6 15 60C5D11 Drive shaft and lower case F100B 6 ...
Страница 172: ...LOWR Lower unit 6 25 60C5D11 Shimming F100B 6 T3 B4 59 0 A3 A1 B2 T2 15 8 A2 34 0 B1 T1 F R P B3 S60C6305 ...
Страница 190: ...LOWR Lower unit 6 43 60C5D11 Drive shaft and lower case F100C 6 ...
Страница 200: ...LOWR Lower unit 6 53 60C5D11 Shimming F100C 6 ...
Страница 209: ...60C5D11 7 2 1 2 3 4 5 6 7 8 9 MEMO Special service tools ...
Страница 210: ...BRKT Bracket unit 7 3 60C5D11 Tiller handle 7 ...
Страница 212: ...BRKT Bracket unit 7 5 60C5D11 ...
Страница 214: ...BRKT Bracket unit 7 7 60C5D11 ...
Страница 244: ...BRKT Bracket unit 7 37 60C5D11 Gear pump F100B 7 ...
Страница 321: ...62Y5A11 TRBL SHTG 1 2 3 4 5 6 7 8 9 Troubleshooting Power unit 9 1 Bracket unit 9 11 Electrical systems 9 15 ...
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Страница 344: ...YAMAHA MOTOR CO LTD Printed in the Netherlands Jun 2001 0 5 1 CR F100BET F100CET E ...