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Discussion Starter #1
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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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...
 

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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 :p:D??? LOL
 

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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..
 

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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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Discussion Starter #10
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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DING DING !!! Correct on the water light, Come on Kyle, read that manual some more bud:p:rolleyes:;):D
LOL. I was reading it since my post as I figured I put myself out there. The water light is red as well. Updated my previous post. This is what happens when you own your second RC51 years later and have only ridden it twice before winter. :rolleyes::) Too much multitasking with nfl and grilling a chicken outside (-25) and this.

My guess is that maybe the bike is low on coolant and it isn't circulating worth a damn. This leads to hot spots and diverging readings between the red light and the temperature reading. A check of the coolant level in the rad would be telling.

Next guess would be a new temp sensor, but gotta read the manual :)
 

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Discussion Starter #15
Was just out running the bike. Let it warm up to 200 degrees, and didn't get a coolant light. While digging around taking the plastic off I found the someone before me has cobbled up the wiring under the fairing. I'm gonna have to straighten all that out to make sure I don't have so short in the wiring. Like I said, the coolant light has never come on when just sitting still. But the one time I did ride it, it kept coming on and then going out. Coolant system is full, although I am going to drain and replace the coolant with new. Same with the oil. I have only had the bike for about a month and it looks like I'm gonna finds some things that need to be fixed. Oh well! Gives me something to do until the weather gets good and stays that way for a while.
 

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Discussion Starter #17
Thanks for the info on the engine ice. I had read about that, but hadn't made a decision on which way I wanted to go yet. Got some broken plastic to deal with. Inner fairing piece is broken. And of course in a place that was nearly impossible to see without taking it off. I knew something had happened prior to me buying it. There were a couple of tell tale signs of it probably being dropped. Sucks! But I will geal with it.
 

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So when you riding it, the green light comes on? Second is bike stock, two radiators/1 on each side? With fans on each side that work??
What is the highest temp the bike shows while moving?
 

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Discussion Starter #19
Yes as far as I can tell the bike is stock. Has an undertail kit, but that's it. Radiators on both sides with fans. I have not had a chance to test the fan operation. According to the manual they should operate at 230 F. I have not seen any temp much over 205. But that was just idling in the garage trying to see if the coolant temp light would come on. I have only had it out for a ride once. Outside temp was around 50F so, not really what I would consider a normal riding temp. But when I did ride it, the red coolant temp light, just left of the oil pressure indicator was coming on and off with indicated temps between 185 and 165. The coolant system is full and from running it, I fairly sure the thermostat is operating properly. Have not had the coolant light come on except for when I had it out for a ride.
 

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...While digging around taking the plastic off I found the someone before me has cobbled up the wiring under the fairing...

Looks like a good area to investigate further.
 
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