cdi on fire ?

[nc24wood]

hello im new to this site but i have a problem with my 88 vfr400 nc24 which i have just bought off ebay :( the guy who was selling it put a link to a video of it runnin and it sounded shweeet however he had it runnin and then it just cut out and he said hed had traced the fault to a suspect cdi so i had a word with one of my friends who owns a bike business told him the symptoms and he said cdi too and he had one,so i bought the bike with intention to have a look myself , it would light the oil and neutral lights but not turn over , i checked the fuses and the 10 amp starter fuse was blown so i changed it and it started woo hoo i thought but no after 15 seconds it blew again and cut out with the cdi box smoking ??? i later found a nut loose and rattling around in the fuse box could this have caused a short ??? now with a bigger fuse it will start but yhe cdi smokes a lot is the damage done to the cdi now :club: :dunce: :club:

[IanM]

Firstly, hello, good morning and welcome the VFR club. Almost everyone is mad, but you’ll find that we’re a pretty helpful bunch too. Someone much more knowledgeable than me will be along to give you a view in a little while, but that sounds like a bike with a serious problem to me. When you’ve got it sorted, I am sure you’ll enjoy it.

[JZH]

My, aren't you a trusting soul...I hope you didn't pay much for the bike! I've never heard of a smoking CDI, so all I can suggest is that somebody's had a go at the wiring harness and really screwed it up. CDI boxes are not cheap, and I think you will soon tire of replacing them. Might be better to buy a secondhand wiring loom and replace yours with it. Yes, it's a bit extreme, but electrical problems are a bitch when you have no idea what's already been done to "fix" the problem.

If it's not the wiring, then it could be a faulty reg/rec allowing overvoltage into the system--in theory that could bugger the CDI. Might be worth the investment in a new reg/rec--before you fry another CDI. :dunno: Good luck!

Ciao,

[Odie]

now with a bigger fuse it will start but yhe cdi smokes a lot is the damage done to the cdi now :club: :dunce: :club:NOOOOOO :eek: ................original fuse ratings are chosen for a good reason. ;) There's only so much current an item will draw for normal use, if it starts to draw more current then something's a bit amiss. :( If a fuse keeps blowing, then it's doing it for a damned good reason and needs investigating rather than just ram a higher rated fuse in. :B Luckily the post isn't about how your bike's wiring has gone up in flames. :rolleyes:

Go with JZH's suggestions. :) Until you get it running safely, you can't really test out the charging circuit but it might be worth getting a new rectifier/regulator.

[nc24wood]

ok took a refreshed non alcohol influenced look today started by givin the battery a charge ;) then had another look at the loom - found nothing amiss ;) replaced the starter fuse with a 10 amp ;) tried it again and smoke :mad: tried my cdi on a mates nc24 and fine no hiccups -nothing :mad: tried my mates cdi and smoke -bugger :mad: pulled out my clutch switch diode and viola runnin with no smoky cdi , i just have to pull the clutch in to start it :} went for a quick blast and the battery went flat DOH checked the voltage to the battery and its non exsistent ??reg-rec or alt??? :dunno:

[nc24wood]

Firstly, hello, good morning and welcome the VFR club. Almost everyone is mad, but you’ll find that we’re a pretty helpful bunch too. Someone much more knowledgeable than me will be along to give you a view in a little while, but that sounds like a bike with a serious problem to me. When you’ve got it sorted, I am sure you’ll enjoy it.
:beer: why thank you very much :beer: would have been here sooner if id known about it :dunno:

[nc24wood]

should it be the same principal as a car so you can disconnect the battery while the engine is running ?? and it keeps going :dunno:

[nc24wood]

jus charged the battery lobbed it on and ran it , it felt really flat no power and yuk i put the multimeter on it and its doin 20volts tickover and 30 reving !!!! iv turned it off and im gettin a reg/rec tomorrow
:bang:

[IanM]

im gettin a reg/rec tomorrow
:bang: Sounds like a resonable place to start. Good luck!

[nc24wood]

look at all this nice weather and i still have no bits :mad: :bang:

[IanM]

look at all this nice weather and i still have no bits :mad: :bang: Sir, have you met our QOTM (http://www.bikersoracle.com/vfr/forum/showthread.php?t=65167) thread?