Honda CBR400F - No Spark.. pls help

Freedom · 10-28-2009, 2:30 PM

My Honda CBR 400F has no spark at all plugs.
all wiring are connected properly.
where do I start to diagnose the problem?

stevecbr1000 · 10-28-2009, 3:18 PM

do clock lights all come on?, does it turn over ok?, is the battery in good order?, it could be a number of things, bad coils, cdi unit, pick up coil, starter switch, could be something as simple as a brake in the wiring loom somewhere?, i had a similar problem with my old blade, no spark at all, i ended up stripping the loom, then found the problem was corroded wires..

Freedom · 10-28-2009, 4:45 PM

the battery os ok, the starter runs.
for sm reason, I dont even have power to the coils.
instead of + I have - (when l connect a testing lamp to the coil (2 side connection) and to the + off the battery - I have light.
which means that sm how, it gives me -.
but when I start, and the starter runs - the light is off.
checked all connections and its connected, and the current runs through all the wires from A2B2C etc. (I mean theres no cut on the wires or corrode)

stevecbr1000 · 10-28-2009, 5:39 PM

do you have an alarm etc on your bike, if you do, check that as well, could be your cdi unit gone bad, you should have battery voltage, 12.8v etc at the coils with ignition on but engine not running, electrics are a pain in the ass, i still think it could be a wiring problem, if you have no luck, it may be worth opening up the loom and following the wires back from the coils, and check for problems, as the wires from the coils join in with 4 or 5 other wires in the loom, so the problem may not be where you expect it to be, sometimes electrics make no sense, good luck..

Surffrog · 10-29-2009, 2:06 AM

Quote:

Originally Posted by Freedom

the battery os ok, the starter runs.
for sm reason, I dont even have power to the coils.
instead of + I have - (when l connect a testing lamp to the coil (2 side connection) and to the + off the battery - I have light.
which means that sm how, it gives me -.
but when I start, and the starter runs - the light is off.
checked all connections and its connected, and the current runs through all the wires from A2B2C etc. (I mean theres no cut on the wires or corrode)

Then I think your stator coil has died, hence the reversed readings your getting.