chewy Posted May 31, 2009 Report Share Posted May 31, 2009 Im sure I've been down this road before but am too senile to remember. i've just rebuilt 200 rev 3 08 mains & stator ..everything is nice except that the fan isn't running fast enough... obviously I.ve been poking about behind the headstock reconecting the stator , refilling the rad etc. the one light that is working stays at same brightness no matter how many revs its doing so is there anyone who hasexperinced this and got any ideas ? how difficult is it to get to this area, is it remove rad job? I guesse its a dodgy earth but as its such a difficult place to get and look previous experience would be big help. Quote Link to comment Share on other sites More sharing options...
nzralphy Posted June 1, 2009 Report Share Posted June 1, 2009 Chris. Now i know times are hard..... but you have to go back to using the high octane gas. Not only does it burn better it also makes better electricity! I seem to remember getting this some years back when a fan motor was stuffed. Ralphy Quote Link to comment Share on other sites More sharing options...
copemech Posted June 1, 2009 Report Share Posted June 1, 2009 A slow running fan can be caused by a faulty regulator or rectifier. The motor itself should be tested by putting 12V to it . If lights change non when revving, my intuition suggests a regulator which is limiting the voltage too much, yes this happens. Quote Link to comment Share on other sites More sharing options...
chewy Posted June 1, 2009 Author Report Share Posted June 1, 2009 Thanks guys not too much to go on then.. I'm beggining to wonder if this may be a chicken or egg situation as It wasn't me riding the bike at tthe time ; as sensitive as women can be they dont seem to be too aware of mechanical things. Sposse that may get me in trouble! Quote Link to comment Share on other sites More sharing options...
chewy Posted June 2, 2009 Author Report Share Posted June 2, 2009 Just in case anybody else has experience on this I checked voltage at wires to Rad/therm switch on both bikes voltage is 8.4 then put both bikes ticking over in the sun one ( the most recent rebuild) had fan come on within 5 minutes and it will only go off if I blow airline onto the switch no matter how long I wait. The other rebuilt 2 months ago I had to rev it quite hard to get the fan to come on ..it did and it went off after a minute or so (functioning correctly one assumes) ( Incidentally the fan speeds appeared to be same but the correctly functioning fan was pulling hotter air) I then thought maybe water not circulating.. airlock ...pump impeller knackered so took cover off and found dreaded corrosion so I have to fix this now (maybe all the bits of corrosion are blocking the rad?) before continuing investigations. My next move after flushing rad and fixing corrosion will be to swap the rad/thermo switches. Has anybody out there found a good repair for this corrosion around the O ring seal on water pump housing? Quote Link to comment Share on other sites More sharing options...
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