gazzaecowarrior Posted May 26, 2013 Report Share Posted May 26, 2013 Since buying my little 05 125 the fan has not kicked in when the engine has warmed up. IM not new to beta so i by passed the thermostat and the fan kicks in. So i presumed it must be the thermostat. Just fitted the new thermostat and still no joy. Ran it to the point the bike was going to boil and still no action. I am puzzled as i was certain a new thermostat would fix it. What could be wrong ? Could there be a blockage in my rad ? Help. Ive just tested the circuitry of the old thermostat in a cup of hot water with a volt meter and it does work. Quote Link to comment Share on other sites More sharing options...
totalshell Posted May 26, 2013 Report Share Posted May 26, 2013 there cant be much wrong with it .. is the water getting up to temp. as i remember all you do is whip the wires off stat and join them together to test the fan and if it works its the stat.. if the stat is working via a boiling water test all is good mechanically.. so the stat is not getting hot enough insitu.. if you ve run it for 10 mins and the fan dont come on then the stats sat in an air pocket and not water..is the pump working?? Quote Link to comment Share on other sites More sharing options...
gazzaecowarrior Posted May 26, 2013 Author Report Share Posted May 26, 2013 there cant be much wrong with it .. is the water getting up to temp. as i remember all you do is whip the wires off stat and join them together to test the fan and if it works its the stat.. if the stat is working via a boiling water test all is good mechanically.. so the stat is not getting hot enough insitu.. if you ve run it for 10 mins and the fan dont come on then the stats sat in an air pocket and not water..is the pump working?? Thanks for the response. Just drained out all the coolant. Put an airline through the drain hole and blew through the radiator cap and then the thermostat hole in case any gunk was blocking. Then refilled. Ran for ten mins. Still no action. Surely it should have kicked in by then. Is there a simple way of checking the pump is working without taking off the pump housing ? Quote Link to comment Share on other sites More sharing options...
0007 Posted May 26, 2013 Report Share Posted May 26, 2013 My method of diagnosing stuff like this is to do it all with the bike When the thermal switch is on the bench all you can tell is the switch works on the bench So, get hold of an infra red temp gun, they are easy to find now a days Run the motor and test the temp of the rad and or head exactly where the switch is Leave your ohm meter connected to the switch while you do it If the switch does not get to the temp it is intended to switch at then you learn something If it switches but the fan does not come on then you learn something The bike is the best place to test this stuff Good luck 1 Quote Link to comment Share on other sites More sharing options...
0007 Posted May 26, 2013 Report Share Posted May 26, 2013 Oh, to test coolant flow: Drain the coolant out Replace with water Take the output side hose (the on to the top side of the rad) and point it at your buddy Run the bike and it should pump all the water out rather quickly Quote Link to comment Share on other sites More sharing options...
gazzaecowarrior Posted May 26, 2013 Author Report Share Posted May 26, 2013 Oh, to test coolant flow: Drain the coolant out Replace with water Take the output side hose (the on to the top side of the rad) and point it at your buddy Run the bike and it should pump all the water out rather quickly Thanks for that. Will give it a go Quote Link to comment Share on other sites More sharing options...
gazzaecowarrior Posted May 26, 2013 Author Report Share Posted May 26, 2013 (edited) Oh, to test coolant flow: Drain the coolant out Replace with water Take the output side hose (the on to the top side of the rad) and point it at your buddy Run the bike and it should pump all the water out rather quickly I took off the hose on top of the cylinder head as it was easier to get too. Water did come out but it was more if a ouze than a fountain. Put my finger over it and could feel some pressure. My mate thinks IM not letting it heat up enough. It is only ticking over for ten mins. Daren't not rev it too much or the neighbours complain. Should water be flying out of this hose when disconnected? Also how many minutes on idol should the fan kick in ? All my other bikes have kicked in within ten mins Edited May 26, 2013 by gazzaecowarrior Quote Link to comment Share on other sites More sharing options...
nigel dabster Posted May 26, 2013 Report Share Posted May 26, 2013 check power to stat and fan directly and everything works, 10 mins at tickover in the cool temps we had probably not enough, ie the rad is cooling the tickover generated heat (its doing its job) probably all ok. Quote Link to comment Share on other sites More sharing options...
betabonkers Posted May 26, 2013 Report Share Posted May 26, 2013 check power to stat and fan directly and everything works, 10 mins at tickover in the cool temps we had probably not enough, ie the rad is cooling the tickover generated heat (its doing its job) probably all ok. told you gaz Quote Link to comment Share on other sites More sharing options...
gazzaecowarrior Posted May 26, 2013 Author Report Share Posted May 26, 2013 told you gaz Ill remind you of that when its seized tomorrow. Don't make me set the dog on you Jason ! Quote Link to comment Share on other sites More sharing options...
0007 Posted May 26, 2013 Report Share Posted May 26, 2013 I took off the hose on top of the cylinder head as it was easier to get too. Water did come out but it was more if a ouze than a fountain. Put my finger over it and could feel some pressure. My mate thinks IM not letting it heat up enough. It is only ticking over for ten mins. Daren't not rev it too much or the neighbours complain. Should water be flying out of this hose when disconnected? Also how many minutes on idol should the fan kick in ? All my other bikes have kicked in within ten mins It's not going to squirt like a garden hose, coolant is kind of tricky If it travels too fast it doesn't spend enough time in the rad and cannot be cooled, then the engine will overheat because it is ingesting hot water I would route the coolant overflow hose so it's easy to see it blow off and just ride the bike If you don't blow coolant you are not overheating and it won't harm the engine if you get it hot enough to blow coolant, just shut it off but look at the fan before you kill it Quote Link to comment Share on other sites More sharing options...
gazzaecowarrior Posted May 27, 2013 Author Report Share Posted May 27, 2013 It's not going to squirt like a garden hose, coolant is kind of tricky If it travels too fast it doesn't spend enough time in the rad and cannot be cooled, then the engine will overheat because it is ingesting hot water I would route the coolant overflow hose so it's easy to see it blow off and just ride the bike If you don't blow coolant you are not overheating and it won't harm the engine if you get it hot enough to blow coolant, just shut it off but look at the fan before you kill it Ok. Thanks. Will give it a go and let you know Quote Link to comment Share on other sites More sharing options...
gazzaecowarrior Posted May 27, 2013 Author Report Share Posted May 27, 2013 Success. 15 mins at quarter throttle on a quiet bank holiday and the fan leaos into life. Neighbours will hate me but pleased it works. Thanks for all the advice. Gareth Quote Link to comment Share on other sites More sharing options...
betabonkers Posted May 27, 2013 Report Share Posted May 27, 2013 :-) :-) Quote Link to comment Share on other sites More sharing options...
gazzaecowarrior Posted May 27, 2013 Author Report Share Posted May 27, 2013 :-) :-) Galvin your a cheeky so and so. Glad your back on a beta Quote Link to comment Share on other sites More sharing options...
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