Question about 1989 Honda CBR 400 RR

1 Answer

HI , my friends CBR 400 1989 keeps blowing the main fuse. It can sometimes drive for up to 20 kms ,it starts to cut out and finally when he or I try to start it again it runs rough and blows the main fuse, I opened and cleaned the ignition and kill switch switch,rerouted the battery live and neutral leads.Cleaned all terminals from the relay to starter motor to alternator. The regulator ground was very coroded .In fact most of the electrics have seen too much water for my liking. He has ridden it for 800 kms without fail until now. Could it be the corrosive battery terminals(now spotless) have taken out some electrical component? I m at a loss here coz all continuity checks with all leads from relay,battery etc are spot on Matt Ireland

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  • mattoleary2 Mar 28, 2011

    You re good !!

    the regulator centre pin ( feeding one of the yellow wires) had no resistance.

    The regulator looks goosed!!

    When we get a replacement reg should it be safe to ride the bike or could something else blow with it when I connect it?

    If I dissconnect the reg can he ride the bike to a garage without damaging other components?

    I know his battery wont be charging so he cant turn it off but I dont want to take anymore responsibility if this doesnt do the job and get him to a certified bike mechanic.

    Thanks matt

  • mattoleary2 Mar 28, 2011

    I think he has solved the problem but I wont know till I buy and fit the regulator.
    IF hes right -top marks !!!
    Thanks again
    Matt

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First thing I'd be checking is the regulator. It's probably been degraded from the corroded ground or may have even taken in some water!

Posted on Mar 27, 2011

  • Norman Skinner
    Norman Skinner Mar 28, 2011

    If it were me, I'd just get the regulator, put it on and be done with it - I don't think anything else is likely gone, but of course I can't see the condition of anything so that's a call you'll have to make.
    Once the regulator is in, the battery will start charging properly again, and all should be well in the bike's universe.
    If you know there are other corroded items etc. you may want to take care of them before they become an issue.
    In short, we won't really know if there are other issues til that regulator is in.

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If you driving down the road for 30 minutes or 15 miles and blow a fuse you have soft/flying short and may take some time and patience to find.
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