1 ECUs never fail... Mon Mar 09, 2020 3:05 pm
Suzi Q
Life time member
Every once in a while there'll be a 'bike not running' thread, and the OP will looking narrow-eyed in the direction the ECU...
I'll head for the keyboard, probably post a picture of a mashed up, highside-then-hit-a-tree K100 ECU and point out that the thing still carried on working once I'd bashed the ally casing straight again. Nope, nobody need worry about the ECU.
So after three days of troubleshooting, everything, on the Madass, turns out it was the ECU, that had gone poorly with some very weird symptoms:
Bike started & ran fine, but misfired (just like a HT/plug cap/spark plug fault) at 5500rpm. Coughing and kicking and refusing to rev any higher (no matter how much I tried, ahem).
Rode it for a while like this, thought it was the damp weather - must look at the HT leads etc.
Bike would rev to 7-8 ish if not under load - i.e. testing in the garage.
Plugs not bad, maybe a little sooty.
Exhaust gas nice and clean.
Bike would nearly rev fully out if I stuck my hand 3/4 over the AFM inlet, whilst fully opening the throttle.
Bike would do the same if I manually turned the AFM vane fully open.
(Okay, so the last couple of points suggest a weak mixture - I replaced the blocked & collapsed 30 micron fuel filter (yay I've found the fault!) and this gave NO improvement, gnash gnash gnash)
FINALLY, swapped the they-never-fail ECU and bingo.
Took the old ECU to bits and saw this....
....which is what I'd expect to see inside a thirty year old ECU - I have no idea what I'm looking at lol
I'll head for the keyboard, probably post a picture of a mashed up, highside-then-hit-a-tree K100 ECU and point out that the thing still carried on working once I'd bashed the ally casing straight again. Nope, nobody need worry about the ECU.
So after three days of troubleshooting, everything, on the Madass, turns out it was the ECU, that had gone poorly with some very weird symptoms:
Bike started & ran fine, but misfired (just like a HT/plug cap/spark plug fault) at 5500rpm. Coughing and kicking and refusing to rev any higher (no matter how much I tried, ahem).
Rode it for a while like this, thought it was the damp weather - must look at the HT leads etc.
Bike would rev to 7-8 ish if not under load - i.e. testing in the garage.
Plugs not bad, maybe a little sooty.
Exhaust gas nice and clean.
Bike would nearly rev fully out if I stuck my hand 3/4 over the AFM inlet, whilst fully opening the throttle.
Bike would do the same if I manually turned the AFM vane fully open.
(Okay, so the last couple of points suggest a weak mixture - I replaced the blocked & collapsed 30 micron fuel filter (yay I've found the fault!) and this gave NO improvement, gnash gnash gnash)
FINALLY, swapped the they-never-fail ECU and bingo.
Took the old ECU to bits and saw this....
....which is what I'd expect to see inside a thirty year old ECU - I have no idea what I'm looking at lol
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Sometimes I'm not really Suzi Quatro.