rexy Posted October 8, 2009 Report Share Posted October 8, 2009 Hi guys, have just joined today after purchasing my first trials bike a sherco 290 02 model. Was out on the bike today and noticed the fan did not kick in at all. I have tested the fan with a car battery and its working fine, also by passed the thermostat(connecting wire across) and it still does not come any. Any ideas what it could be? All help much appreciated. Dont want to cook my first bike, would not make a good start to trials. Cheers Rexy Quote Link to comment Share on other sites More sharing options...
trialsnutterman Posted October 8, 2009 Report Share Posted October 8, 2009 Hi It will probably be this part C039 Sherco Radiator Fan Diode It a bridge rectifier and capacitor used to convert the AC current from the stator into smooth DC current suitable for the fan motor. Quote Link to comment Share on other sites More sharing options...
andysv1k Posted October 8, 2009 Report Share Posted October 8, 2009 and if it is, dont get sucked into paying manufacturers costs. My rectifier gave up last month. A new gasgas one was Quote Link to comment Share on other sites More sharing options...
wayne_weedon Posted October 8, 2009 Report Share Posted October 8, 2009 (edited) and if it is, dont get sucked into paying manufacturers costs.My rectifier gave up last month. A new gasgas one was Edited October 8, 2009 by wayne_weedon Quote Link to comment Share on other sites More sharing options...
copemech Posted October 9, 2009 Report Share Posted October 9, 2009 Hehe! Yet some will still say it's not the same eh? True a (full) bridge rectifier is just 4 diodes in a bridge configuration no matter what their purpose!A local Maplin store would have something I'm sure. Wayne... Yea, easily enough done, I can pot one in for you and provide the proper connections and such for only $50 plus the post! Quote Link to comment Share on other sites More sharing options...
andysv1k Posted October 9, 2009 Report Share Posted October 9, 2009 Yea, easily enough done, I can pot one in for you and provide the proper connections and such for only $50 plus the post! I'll do it for 49.50 Andy. Quote Link to comment Share on other sites More sharing options...
rexy Posted October 9, 2009 Author Report Share Posted October 9, 2009 cheers for the replies. I did think about doing one myself but done have the time(12 hr shifts) so just ordered it last night for Quote Link to comment Share on other sites More sharing options...
andysv1k Posted October 10, 2009 Report Share Posted October 10, 2009 when you say ordered one, do you mean a rectifier? I didnt have to build mine, i got it as a complete bridge rectifier, potted with spade connectors, took 5 mins to install. its more than likely rated higher than stock and cost Quote Link to comment Share on other sites More sharing options...
trialsnutterman Posted October 11, 2009 Report Share Posted October 11, 2009 Andy Have you got a capacitor on it to smooth out the ripple, just making sure as a new fan is a lot more than a the new rectifier. Quote Link to comment Share on other sites More sharing options...
andysv1k Posted October 12, 2009 Report Share Posted October 12, 2009 When you say ripple, what exactly do you mean? There is a regulator there, that will cope with all the overvoltage and clean it up. It is actually a new fan too, the old rectifier blew because it had no fixing and fell into the fan, stalled it and burn both out! Andy. Quote Link to comment Share on other sites More sharing options...
trialsnutterman Posted October 12, 2009 Report Share Posted October 12, 2009 Andy The rectifier went on my brothers bike and as I wasn't exactly sure what it was I chopped it up to have a look inside, I found 4 diodes in a bridge and a capacitor all potted into that little black box. I'm not sure what exactly you are running but it sounds like just the 4 diodes in a bridge without the capacitor, I don't know the size of the capacitor as it was not identifiable by the time I had got to it, but you will need one. Quote Link to comment Share on other sites More sharing options...
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