Honda Hornet CB900F Spark problem - Wrist Twisters
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post #1 of 5 Old 08-05-2020, 05:41 AM Thread Starter
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Honda Hornet CB900F Spark problem

Hi all, Mark here from sunny England.
I am sprucing up my hornet in quite a radical way (see profile pic) and after the alterations I thought I’d try to run the engine before I go any further. I’ve Reconnected everything that was disconnected and tried to fire the bike but no success.
The starter relay clicks, dashboard lights go on off as normal, the engine turns over just as it did two years ago (I know it’s been a while) battery is freshly charged and good voltage, alas no spark from the plugs.
The only engine mod is PAIRS valve block off.
I fitted an external fuel pump thats pushing petrol to the right place.
I fitted a new LED headlight, so other than that the wiring loom is intact as before.
The Regulator/Rectifier has been repositioned and plugged back in- I think the same way, but with all three words being yellow, it’s not helpful. This shouldn’t prevent the bike starting I assume, just charging properly.
The bike has been legendarily good at starting time after time with135,356 miles, yep, it’s been a brilliant bike and will be again...so..
Can anyone offer any suggestions as to why it would lose its spark?

Kind regards,

Mark.
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post #2 of 5 Old 08-06-2020, 12:36 PM
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Presuming you have had a look in the fuse box to see that all is well there, the next step might be to check all of the wiring to the coils - any chance there's a missing connection in that area?
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post #3 of 5 Old 08-06-2020, 12:45 PM Thread Starter
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Thanks Kiwiboy, Yes all fuses intact, I've discovered a rusted through clamp on the Ignition Coil, that I thought could cause an earth issue, My neighbor - A mechanic, helped me check some cabling and heavy-handedly bent the connection on the coil, so when I straightened it - oh, off it snapped, So I've just ordered a new ignition coil. Thanks, neighbor haha.

I checked continuity on both coils and all seem ok. Once I get the new coil on I may be able to tell a little more.

It's so odd, as it just doesn't seem to be pushing a spark. I can't find any missing connectors or relays.

I have looked through a load of threads and videos on possible problems, but its a minefield!

Kind regards,

Mark.
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post #4 of 5 Old 08-06-2020, 12:48 PM Thread Starter
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I will try and trace back the coil wires to the ECU tomorrow and see if there's a problem.

It seems with so many sensors that one could be causing an issue. None of them were separately earthed before etc, just clamped under the seat on plastic. 2 years ago, I parked it up to start work, haven't really touched much at all wiring wise, so It's doing my head in!

Kind regards,

Mark.
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post #5 of 5 Old 08-07-2020, 08:24 AM
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I know you said the battery is fully charged and good voltage, but I would take it and get it load tested. There have been quite a few cases on this forum, where people have torn their bike apart troubleshooting to find out the battery was the culprit.

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