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October 21st, 2019, 07:22 AM   #1
Vaz
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fe 390 wont start

hello everybody

i got my fe 390 1 year ago and all was well. about 3 months ago there were times when the bike wouldnt start when cold. it does this once in a while i cant figure out what it is. changed the battery and spark plug but i reckon its either electrical or fuel. i would appreciare your views on this

thanks

vaz
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October 21st, 2019, 10:02 AM   #2
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so it cranks but won't fire? do you smell fuel at all? have you checked spark?
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October 22nd, 2019, 09:07 AM   #3
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Not starting when cold; did you try it with the cold start knob pulled out?
It puts the butterfly valve a little bit open so more petrol is provided.
Other causes; ignition wiring loose or rotten (once just had to replace Spark plug head), too little petrol (filter dirty, not enough pressure, summer fuel instead of winter fuel, etc.), wiring to pump bad ground or loose connection.
But there might be other causes too, just eliminate every possible cause and you’ll find what causes the start problems.
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November 6th, 2019, 03:35 PM   #4
Vaz
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No I don't. Recently changed the spark plug
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November 6th, 2019, 03:42 PM   #5
Vaz
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Nothing to do with the knob. The ignition reacts the same even when I pull it. I'm starting to think it's fuel related but I wanna start from the ignition and inwards. Changed battery and ignition coils recently and there was no problem. Then I used the bike for 5', left it for a couple of hours and it wouldn't start again
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November 7th, 2019, 10:16 AM   #6
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Confirm the pump has power. If it does but is not outputting the correct pressure replace it. Most starting or running issues are fuel related on these bikes.

Last edited by NoClassic; November 7th, 2019 at 10:26 AM.
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November 7th, 2019, 11:49 AM   #7
Vaz
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It gives me 2 flashes on the fi light. It must be the crankshaft position sensor
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November 7th, 2019, 02:35 PM   #8
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Check the wiring from ECU to sensor
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November 8th, 2019, 06:17 AM   #9
Vaz
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The manual says that when the fi indicator flashes twice it's the crankshaft position sensor. My mechanic says it's the pulser coil. Is there a difference?
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November 8th, 2019, 09:07 AM   #10
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A bad CAS will very likely effect the function of the ignition system. Does not necessarily mean any of the components are bad.
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