Water Temp indicator - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 21 (permalink) Old 01-13-2013, 10:28 AM Thread Starter
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Water Temp indicator

I recently purchased a 2000 RC51. And since its winter here in lovely Indiana I just got to actually ride it for the first time the other day. Seemed all was in order except for the water temp indicator light. It first came on at about 180 indicated degrees. Went off at around 170. Came back on again and did not go out until approximately 165. But then came right back on until the temp went back up to 175. In high tech terms, it ain't doin what its suppose to do.
The actual water temp reading seems to be operating correctly. Have not checked acurracy yet. But I'm guess by the way it is working that it is ok. The red water temp light though has me a little confused as it gets it signal from the same sensor I think? Anyone ever had this issue? Thanks!
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post #2 of 21 (permalink) Old 01-13-2013, 10:58 AM
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I guess I'd start by removing the right fairing, then when bike is cold, leaning on the sidestand, start it with the rad cap off. use a thermometer in the radiator to compare coolant temperature to your gauge reading, just to verify that. The water won't actually start circulating till around 167F degrees. It should be actively circulating by 172 degrees. (Assuming your Thermostat is in working order) By about 190 it may start to swell up over the filler neck so watch out for that.
About the light, I'm not sure. Someone here will know about that tho...

John, 2000 RC51 #000100

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post #3 of 21 (permalink) Old 01-13-2013, 11:03 AM Thread Starter
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Thanks! That sounds like a pretty easy way to confirm my temp readings. I will give that a try today.
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post #4 of 21 (permalink) Old 01-13-2013, 11:20 AM
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As for the light issue, I dunno on that one....wait for the Living/breathing Service manual to chime in, Mr.SubSailor where is you ??? LOL

-2001 Honda RC51 sp1 " Slightly Modified "
-2001 Honda 929RR Erion Edition
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post #5 of 21 (permalink) Old 01-13-2013, 02:14 PM
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I've never seen a water temp light come on before and the light shouldn't be coming on until the bike gets stupid hot, I think 250* so u have a problem.
And the red light is oil pressure not water..
But I'd start by checking to see if system is full of coolant. Then I'd get a service manual and see what it says about the light illuminating. It probably needs the temp sensor swapped out, which is on the left side between the cylinders.. Blue/red wire attached I believe but that's just off the top of my head so that may be wrong..

03 RC-a few nicnacs.

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post #6 of 21 (permalink) Old 01-13-2013, 02:23 PM
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EDIT. Not good at all to get a red light. OP and all new owners should read the owners manual before riding. Otherwise it could cost big $$.

Last edited by kwtoxman; 01-13-2013 at 02:39 PM.
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post #7 of 21 (permalink) Old 01-13-2013, 02:30 PM
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Makes no sense as noted. There is no water light. Not good at all to get a red light. OP and all new owners should read the owners manual before riding. Otherwise it could cost big $$.
LoL- why would they do that! But there is a water light, but like I said it shouldn't come on until 250*

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post #8 of 21 (permalink) Old 01-13-2013, 02:33 PM
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LoL- why would they do that! But there is a water light, but like I said it shouldn't come on until 250*
DING DING !!! Correct on the water light, Come on Kyle, read that manual some more bud

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post #9 of 21 (permalink) Old 01-13-2013, 02:40 PM
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Thanks! That sounds like a pretty easy way to confirm my temp readings. I will give that a try today.
If you have any more issues, let me know. How close to Indianapolis are you?



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post #10 of 21 (permalink) Old 01-13-2013, 02:41 PM Thread Starter
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Maybe my incorrect name for it is causing a problem. The service manual, (which I have been reading like a novel) describes the coolant system instrumentation as the temp. gauge, and indicator. The gauge is the digital readout which is located in the same position as the odometer / trip meter. The indicator light is second from the right, just left of the oil pressure indicator. I have not had the oil pressure light come on when running. I have had the coolant indicator come on when riding the bike. But has never come on when just sitting and running in the garage. I am going to check to verify the accuracy of the temp. gauge, but I cannot imagine the temp. Is any where near the 251 degrees F the manual says is where the indicator should come on, and the gauge should flash. Guess my main confusion is it appears that the signal wire for both the indicated temp and the indicator light is the green/blue wire from the thermo sensor. Hard to imagine that one could work fine and the other be intermittent.
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