92KK 84WW Olaf
Life time member
Number of posts : 7955
I am not so good with electrics, but the thing is you have got power to fuel pump etc if all is turning over. With what I have picked up on the forum pressing the start button powers up the fuel pump etc only for as long as is needed for the engine to be turning over and start. Once its running then the Hall Effect Sensor provides the signal and that comes into the FICU under the seat. I have a friend over here who used to work in BMW and we have each time identified this as the problem.
If you are happy with the unit AND the quality of the loom wiring into the plug [as in no breaks in it] then not too sure where to go. The whole system works via earths and if they are not good strange things happen. There are also quite a few posts about starter motor brushes doing weird things like this too and its not much trouble to get at them.
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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