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1991 VFR Over heating

Discussion in 'Mechanics Garage' started by Cheif, Oct 15, 2014.

  1. Cheif

    Cheif New Member

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    So my bike started over heating so I checked water pump and it's ok.

    checked tubes for corrosion or build up and they're all clear.

    Fan wasn't turning on so installed fan switch. I turn on the switch as soon as I start riding so that's not the problem.

    I used water wetter and it didn't help any.

    Anyone have any other solutions?
     


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  2. skimad4x4

    skimad4x4 "Official" VFRWorld Greeter

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    Emm how many other problems has this bike got?

    I just responded to your post about the bike not starting after you stopped at a filling station, and now spotted this. Which gets me thinking could the two things be related?

    So before we start chasing all the wrong clues - (I know you will be stressed out the bike is misbehaving) - take time to think through precisely what problems presented when and then list them down in sequence. Its also helpful to know what servicing the bike has had and what if any recent mods/work have been done - just in case you may have disturbed something which has triggered the problem? That may give us all a better understanding of what could be wrong with the bike.

    Whilst you state the bike is overheating (and I assume you already know these bikes are known for running hot - especially in hot weather) so what was the temperature gauge showing, what sort of weather and riding conditions applied at that time and did the coolant bottle take a dump?

    Even when riding you should be able to hear the fan come on at town speeds - it should rarely if ever be necessary when the bike is making progress on an interstate - but if you need come to a halt after a long fast run the temp gauge will rise quickly and should trip the fan into action. Could you hear the fan running? If not, you can easily test the fan runs by feeding 12 volts direct from the battery. If it runs fine - then continuity testing the incoming power feed. I am not sure if your bike has a simple inline thermostat switch or relies on the CPU - so you need to check the manual or dig out a wiring diagram.

    Did the bike display any other weird symptoms at the time ? Clock resetting? Gauges going to zero? Those are typical signs of a charging system fault and if you were unlucky enough to have that occur when the bike needed the fans to come on to cool the bike it could have precipitated the bike overheating?

    I really hope your day starts to get better...





    SkiMad
     


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  3. ridervfr

    ridervfr Member

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    Fuse for fan? Radiator flush? Thermastat screwed up? I would pop the radiator cap and have a look in there, see if its scaled up and chit. Fan should come on and do a an ok job of keepiing bike oot of red zone. I did a grid lock commute a few days ago on my 93 and had to split thru the lanes for a few miles in 90 degree weather, temp gauge climbed higher than I have seen it in recent memory, but as soon as I got that bitch on the open road it cooled down. :loco: You have a switch on the radiator for the fan motor I believe (its early you know!) you could check that with a test light. Keep us posted
     


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