Hi everyone,
I'm having a no spark problem with my 96 F3.
I was at the track last weekend and the engine just cut out exiting a turn.
I initially suspected the voltage regulator/weak battery since the connection looked a bit melted, however I put the battery on the tender, got it to full charge and still no spark. It shows about 12.4 Volts under no load and about 11.5 when cranking so I don't think that's a problem. None of the 4 cylinders are getting spark, so would it be right to think coils are unlikely(as in both failed at the same time)?
Are there any typical weak spots in the F3 ignition that would be the likely culprits to look at first?
Also, I'm not very familiar with diagnosing electrical systems so any tips you can provide are really appreciated.
Thanks,
Juan

 

Its highly doubtful that both coils went bad at the same time. Check your pickup coil wire connector, it could have vibrated loose. Also, make sure that your engine kill switch is operating correctly. Hondas will turn over, but will not spark if the engine kill switch is turned to the off posisition and maybe that connector came loose. Make sure your coil wire lead connections to the main harness are good and lastly, ensure that your ECU connection is still tight and no wires are pulled out of the connection.

 

hey, thanks ZeroChickenstrips...I was talking to a honda mechanic and he said the same thing about the kill switch, which I didnt realize. I'll have to check the things you mentioned.
thanks for replying !

 

You're wrong my 96 CBR f3 does not turn over if the red switch is off. Im currently going thru the same issue and am in the process of replacing the pick ups.

 

While the focus is on the r/r in these links, they give a good take on over-all
electrical/charging systems diagnostics...

Charging System Diagnostics - Rectifier/Regulator Upgrade - Triumph Forum: Triumph Rat Motorcycle Forums

https://cbrforum.com/forum/f2-tech-9...-solved-27739/

Technical Resources - Resources for Electrical Systems on Motorcycles and ATVs - ElectroSport

I would definitely start by inspecting/cleaning/grease packing all of the connections
on the bike harness. Use di-electric grease to pack the female connectors,
after spraying both with contact cleaner. Don't forget to give all of the switches,
a shot, as well.

You probably needed to do this anyway, if you really care about the bike.
So it's not a wasted effort, issue solved or not.

Never hurts to swap out ALL of the fuses with new.
Just to be sure that's not the problem.

Hope this helps, Ern

 

An added suggestion to this excellent list is this - after each step, try starting the bike. Sometimes these problems will disappear after you make a global change (like greasing all the connectors). It's good to know where the problem came from so that if it comes back, you'll have a good place to start your diagnosis based upon your previous experiences.