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Old 03-23-2009, 08:39 AM   #1
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RC 51

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RC51 engine running hot

This is crazy! When my bike is idling, the tempature stays a resonable 150-170, however when I am riding, the temp shoots up to 200-215 even 225 in a couple of instances. The fan is running, actually it's constantly running. I am thinking maybe a theromstat switch issue, any thoughts would be greatly appreciated.

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Old 03-23-2009, 08:48 AM   #2
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'14 Speed Triple R, '82 CB900F, '13 Streetglide

RC's are notorious for running VERY warm.
There are a number of fixes you can do.

A great resource is

On mine, I've removed the r/h fan assy., added Water Wetter and fins and it's helped a lot.
I'm currently thinking about running the cooing hose so the radiators are in series as opposed the the current parallel set up.
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Old 03-23-2009, 11:12 PM   #3
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F2 w/ F3 engine 2001 RC51

Mine always ran warm. It's odd that it is reading low at idle and high while moving. Mine was always MUCH hotter at idle or in traffic as opposed to moving, maybe it's the sensor if that's accurate though I don't know how it would start reading the inverse all of a sudden.
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Old 03-30-2009, 05:10 PM   #4
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2005 CBR 600RR
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if you havent already got the problem fixed you should remove the fairings and find the temp sensor. i had an r1 way back that had the same problem. what ended up happening was it got upto about 255 and the coolant boiled out.... it was a mess.

after i replaced the coolant 50%water/50%coolant I got the temp down alittle but not alot.

the sensor was stuck, it didnt release or whatever you want to call it. all it took was me tapping the side of it with a hammer(anything) and it came loose and worked fine.

ended up getting stuck several times so eventually i replaced the part but sounds about the same.
only thing that bothers me. you say the temp idles at 150-170, does it go down after you come to a stop?
the r1 only had 1 temp sensor and 1 radiator, you have 3 on an rc51 i'd be curious if there are 3 sensors and it might be just one of them acting up....
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Old 03-30-2009, 06:29 PM   #5
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the problem with the rc fans is that when you are moving and the fans are running it creating negative movement. the fans draw in air from the side and force them towards the middle where the header is. when you are moving the air flow the opposite direction. if the fans are staying on for some strange reason this will not allow air to flow when moving. try installing a disconnect switch to kill power to your fans when moving that way you get natural air flow.
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Old 03-31-2009, 10:55 AM   #6
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They run hot as sh*t.
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