vfr 400 nc30 no spark.

[steveh]

Ive got my mrs's vfr taking up room on my bench due to a very strange electrical fault, and cannot for the life of me find out why!

Basically she went to Tesco, parked up, came out, and the bike wouldn't fire, later found out to have no spark.

Its getting 12v to the CDI, the coils, and all earths are good, the CDI is working as i tested it on a friends bike just before he sold it.
there is good continuity from pulse coils>CDI and from CDI>coils.

Coil packs, on both sides of the windings test okay.

The pulse coils (2 off) are supposed to read between 450-550ohms each. mine were measuring 413/418ohms, so i suspected those, a friend of mine had a set off a spare engine that "he was told was running"
Across either side, they tested 421/420ohms, not much better than mine, but i tried them anyway, no spark.
Im starting to think that ive got two bad pulse coils, but cant see this being very likely!


im temped to try find another wiring harness, and or another set of pulse coils, the bike is totally standard, and has had no wiring modifications atall, i cannot see why it wont run, ive bypassed the kill switch, the ignition barrel, and the clutch switch.
(there is no side stand switch)

Really need this bike sorting, as we have a rally at the end of the month.

if anyone can give me any ideas to try, i will be very greatfull, or if anyone has a loom or pulse coils that would be a great help!

many thanks, Steve.
____________________
Current : 06 Zx10r, 07 Wr450f SM, 74 850 norton commando, 63 bsa b40, 1962 Triton 650, 67 Triumph Tr6r, 1955 Triton 750, 1978 TY250E.

[Carvel]

Well the coils are separate front and rear so I cant imagine they would fail out of the blue at the same time.

You have missed the golden rule with electrical issues which is to check the fuses.
____________________
2002 Aprilia RSV1000R, Cbr600Fs, Mk1 B12, Vfr400 NC30...

Matt B: I can deal with crushed nuts to beat Ollie.

[steveh]

[Carvel]

Yeah sorry I misread what you said. In that case i'd be ripping into the loom and checking for a short somewhere.
____________________
2002 Aprilia RSV1000R, Cbr600Fs, Mk1 B12, Vfr400 NC30...

Matt B: I can deal with crushed nuts to beat Ollie.

[nowhere.elysium]

Check all the earth points. Don't forget that the starter solenoid has its own fuse with it, too.
____________________
'10 SV650SF, '83 GS650GT (it lives!), Questionable DIY dash project, 3D Printer project, Lasercutter project

[steveh]

[moonzoomer]

Try replacing the battery with a known good one, also check kill switch.

[steveh]

[nowhere.elysium]

Does it get as far as actually turning over? If not, then I'd be looking at tearing into the switchgear.
____________________
'10 SV650SF, '83 GS650GT (it lives!), Questionable DIY dash project, 3D Printer project, Lasercutter project

[moonzoomer]

https://i1142.photobucket.com/albums/n604/mawlarky/nc30_zps4efed27b.jpg

[steveh]

motor spins fine, all lights and everything works (apart from the spark)

Im really heading towards these pick-ups, but the chances of 4 independently wired pickups all dying seems abit far fetched?!

wish i could find a set of known good ones!

steve.
____________________
Current : 06 Zx10r, 07 Wr450f SM, 74 850 norton commando, 63 bsa b40, 1962 Triton 650, 67 Triumph Tr6r, 1955 Triton 750, 1978 TY250E.

[nowhere.elysium]

Corrosion in the 5-pin white plug? I was bitten by that exact same problem today, as it goes; I couldn't start my GS in the middle of the High Beach car park - after checking all the earth points, I ended up pulling apart the headlamp bowl, and lo and behold - shitloads of crufty goodness in the plug that attaches the switchgear to the rest of the loom.
____________________
'10 SV650SF, '83 GS650GT (it lives!), Questionable DIY dash project, 3D Printer project, Lasercutter project

[moonzoomer]

[steveh]

[Leon.davibe]