radiator problem - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 19 (permalink) Old 01-25-2010, 08:23 AM Thread Starter
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radiator problem

Hey guys,
I was riding to work this morning and ata red light I noticed a little smoke comming from the left radiator.. As I waited a thhe red light my temp climbed up just past 200 until I decided that was enough and just ran the light. I never heard the fan click on.. Could this be the problem? Otherwise the bikes running fine. Thanks for any help..
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post #2 of 19 (permalink) Old 01-25-2010, 11:00 AM
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My fan doesn't come on until 217*. Did you notice any leaking or anything after you stopped and parked it?
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post #3 of 19 (permalink) Old 01-25-2010, 11:05 AM Thread Starter
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217.. I thin thats right around the temp I left the light at.. I didnt hear it click on. When I parked it I was trying to listen for anything or feel anything.. It was still dark out.. I thought I felt some moisture above the radiator but since it was early morning its hard to tell if it was coolant leaking from smewhere or just condensation.
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post #4 of 19 (permalink) Old 01-25-2010, 11:41 AM
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What you need to do is park it and let it idle till it gets up to operating temp and then start looking for leaks, you should be able to see them pretty quick. Mine was a pin hole leak right near the top. Also let it idle till it gets real warm and see if your fan is coming on if it doesn't just make sure to turn it off before it overheats
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post #5 of 19 (permalink) Old 01-25-2010, 11:51 AM Thread Starter
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how hot is too hot? Ill do that today..
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post #6 of 19 (permalink) Old 01-25-2010, 02:51 PM
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how hot is too hot? Ill do that today..
When it gets to 251 deg F., the temp display with start flashing and a temp light will come on.
Shutdown immediately and let it cool off or risk engine damage.
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post #7 of 19 (permalink) Old 01-25-2010, 02:54 PM
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For whatever reason, leaks from the left radiator are more common than the right radiator.
Also, check if the bearings in the fans are ok.
When I was checking my coolant leak issues, I noticed my left fan bearings were squeaking when spun. So I replaced both fans to be sure.
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post #8 of 19 (permalink) Old 01-25-2010, 03:00 PM Thread Starter
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Thanks for the info... I never got close to 251 so that makes me feel better.. Looks like rain tommorow so Ill look at it after work then..I appreciate you guys helping me out.. Thanks again!!
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post #9 of 19 (permalink) Old 01-25-2010, 04:05 PM
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217.. I thin thats right around the temp I left the light at.. I didnt hear it click on. When I parked it I was trying to listen for anything or feel anything.. It was still dark out.. I thought I felt some moisture above the radiator but since it was early morning its hard to tell if it was coolant leaking from smewhere or just condensation.
Yeah the fans don't come on until around 217-218 and stop at around 205 I believe. Well, at least mine do.
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post #10 of 19 (permalink) Old 01-25-2010, 05:19 PM Thread Starter
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well I had to run an errand after work and when I got there I stopped for a min and could see a good amount of coolant coming out from behind the left side lower, the temp never even got to 200 though. I got home and it looks like ill need to pull off the fairing and run her to see where its coming from. Ill do it on Wed when im off..
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