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March 29th, 2008, 01:32 PM   #1
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Cooling fan temp switch

Hi All

The temp switch that came with my cooling fan is rated at 85 deg c cut in and 80 deg c cut out, basically the fan runs most of the time, I have read that a lot of people install a separate switch, I do not want to do this, so was wondering if any of you have sourced a higher rated temp switch to replace the standard one and at what rating would you all recommend, I was thinking maybe 95 in 90 out might do.
Thanks for any info
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March 29th, 2008, 01:36 PM   #2
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Tells us about your riding: altitude, temperature, speed, type, fast trails, tight trails, jetting etc.. Then we can give you better advise on your situation.

Dale
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March 29th, 2008, 02:00 PM   #3
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Gday DaleEO
Approx 1000 metres above sea level, temps at the moment around 20-25 deg c, riding mainly tighter single trails in bush land in 2nd to 4th gears, running 15/50 gearing on a 550, do not know the jetting sizers but was set up by a local dyno legend so I am sure it is right.
The bike is not overheating as such it is just constantly in the range of the temp switch, once I get out on the open trails or transports the thermo cuts out after a short amount of time, I just think the temp switch settings are a bit low.
Thanks for any info
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March 29th, 2008, 02:54 PM   #4
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Re: Cooling fan temp switch

Originally Posted by MEDOGROCKET
Hi All

The temp switch that came with my cooling fan is rated at 85 deg c cut in and 80 deg c cut out, basically the fan runs most of the time, I have read that a lot of people install a separate switch, I do not want to do this, so was wondering if any of you have sourced a higher rated temp switch to replace the standard one and at what rating would you all recommend, I was thinking maybe 95 in 90 out might do.
Thanks for any info
Not sure if they are the same thread size/pitch as the KTM switches, but I know the 640 Adventure Katos and the 990s run higher temp switches than the RFS (which is the same temps as your switch)- I have the info somewhere, I'll post it up if I can find it....
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March 29th, 2008, 02:58 PM   #5
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Re: Cooling fan temp switch

Originally Posted by AUSBERG
Not sure if they are the same thread size/pitch as the KTM switches, but I know the 640 Adventure Katos and the 990s run higher temp switches than the RFS (which is the same temps as your switch)- I have the info somewhere, I'll post it up if I can find it....

The 990 comes on at 216 and goes off at 210 (do the math)...
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March 29th, 2008, 03:20 PM   #6
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Re: Cooling fan temp switch

Originally Posted by PowerCell
Originally Posted by AUSBERG
Not sure if they are the same thread size/pitch as the KTM switches, but I know the 640 Adventure Katos and the 990s run higher temp switches than the RFS (which is the same temps as your switch)- I have the info somewhere, I'll post it up if I can find it....

The 990 comes on at 216 and goes off at 210 (do the math)...
On 99o C/Off 102o C approx for the 990
All I can find on the 640 is " 98o C". Presume its the cut in??

Either way, both these switches appear higher temp switchpoints than the switch you have.

Or you could purchase a Jaycar adjustable temperature switch or similar.
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March 29th, 2008, 03:24 PM   #7
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RE: Re: Cooling fan temp switch

Thanks mate
I was going to take it out and go to the auto/bike shop and match it up with something, should be a standard thread.
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March 29th, 2008, 03:34 PM   #8
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RE: Re: Cooling fan temp switch

G'Day Folks,
I'm in the same boat as MEDOGROCKET. We ride together so all the conditions are the same as Tim described. I'm on a 650 though. I fitted a switch to turn the fan off when I stop as the battery goes flat if you have regular stops and regroups and use the button the start again. The temp switch can definitely be at a higher rating as the bikes aren't overheating but rather like to run in that 80 - 85 deg C zone. 85 deg C is not running hot!, so the temp switch needs to be in the zone Tim has explained to help prevent overheating rather than running in the bikes comfortable operating temp zone.
Hey Ausberg you can bring the info with you to the Force Ride !!!!! Ha ha. I haven't had time to chase another temp switch but I imagine it would be available in varying temp zones from the switch manufacturer.
Cheers.
Garry.
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March 29th, 2008, 04:10 PM   #9
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RE: Re: Cooling fan temp switch

Hi Fella's
My 04 KTM adventure 950 manual states, temp switch turns on at 102 deg C (216 deg F).
Same as AUSBERG"s 990.
This seems quite high but works well on the 950 - taking into conseration it has a 1.4 bar radiator cap and compensating tank.
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March 29th, 2008, 04:30 PM   #10
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RE: Re: Cooling fan temp switch

Hi Chooka,
Yep that sounds like it might be the go. The Bergs run a 1.4 cap as well so the 950 switch might be worth a look. With the correct ratio of coolant and the 1.4 bar cap 102 deg C should be ok. I shall check that out. Thanks.
Hey are you coming to the Force Ride in May ?
Cheers
Garry.
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