92KK 84WW Olaf
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Number of posts : 7942
Next time you try to start it, keep your finger on the start button.
If this keeps it running, then your fuel system is running ok, its getting fuel, its getting spark.
What its not getting is the signal from the Hall Sensors to the fuel pump/fuel pump relay. But if its firing with your finger on the start button your Hall sensors are giving signal to the ignition system so its reaasonalbe to assume its not a HES problem.
Check your injection control unit under the seat, the big plug connector and make sure all the pins are clean. It gets power from 2 pins, not one. One is from the start button, the other is from the HES. If no joy then you need to do the same with the Ignition control unit under the headstock.
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1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles.
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles
Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500