www.zxrworld.co.uk

my 2001 zxr 400 keeps blowing the 10amp ignition fuse. i tried puttin a 20 amp fuse in but it blew aswell. The thing is it doesnt blow straight away, it may take a few mins running then just stops (blown) and it dont matter what i do i cant find it tried leanin it over one way or the other still blows any ideas please
Im gettin seriously pi55ed off with it now

Check the starter circuit

http://www.zxrworld.co.uk/Manuals/L%20M ... r%2015.pdf

Page 36.

dont put a larger fuse in. its blowing the fuse for a reason. find out the prob first. bigger fuse could screw up the system more.

Yeah cos if the fuse doesnt blow something else will. Usually the piece of equipment its supplying.

which fuse is it? if it only blows after a short time running it mite be the alternator circuit which cud mean ur rectifer pack is not working and over charging the battery?

only tried a 20 amp fuse to see if it lasted any longer but it was the same. you both say dont put bigger fuse in.... but whats the 30amp one for in the spare ? they all run 10 amp

the 30amp is your main fuse, that blows and your bike is dead

i'd guess short in the wiring loom somewhere which is grounding one side of the fuse.

the gpz did this a while ago - would blow the ignition fuse at random times, not just straight away.

I put a multimeter between the "downstream" side of the fuse and ground (the frame) just after one had blown and it showed zero resistance (short circuit). you could then flex the loom up near the headstock and watch the resistance go up and down! Bearing in mind the other end of the fuse is at 12V and the fuse itself has negligible resistance, it's no surprise when it blows (or that it still blows a 20A fuse)

Never actually traced the short in the loom, touch wood it's been fine for a few months.

Anyway, i'd start by looking for obvious places where the loom might have chafed on something and be shorting out.