Unexplained coolant leak - Honda Motorcycles - FireBlades.org
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post #1 of 5 Old 08-11-2019, 7:04 AM Thread Starter
 
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Unexplained coolant leak

Hi folks

I was riding home from work on Thursday on my 2003 954 when all of a sudden whilst at the lights,
I saw a red light on the dash and noticed i'd reached 128 degrees . The lights turned green and thanks
to some luck from the next sets of lights I managed to air cool it enough to get it home.

When I arrived home outside the garage the bike had coolant on the right side of the lower engine and exhaust which
was boiling. Many hours later I inspected the bike and couldn't see any obvious signs of a leak.

The expansion tank was bone dry but the radiator had about a 3rd coolant left in.

I filled the rad and expansion bottle with water to try and locate a leak, ran the bike for 15 minutes, not a single drop of water emerged from anywhere.
Temperature never rose above 101.

Can anyone perhaps shed some light on what happened that fateful Thursday afternoon?
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post #2 of 5 Old 08-11-2019, 8:42 AM
 
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Re: Unexplained coolant leak

Did you check the bike later on (after it cooled down) after you re-filled it to see if it leaked out again possibly ?

If it's still topped off, maybe try going for a short stroll around the block to see if you can detect the leak while riding/moving - although one would think the leak would occur while stationary as well, definitely strange.

G'luck troubleshooting and let us know what the culprit is when you sort it out !

-'02 Silver/Black CBR 954RR
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-'11 Graphite Black CBR 1000RR
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post #3 of 5 Old 08-11-2019, 9:35 AM Thread Starter
 
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Re: Unexplained coolant leak

Yep, I checked a few hours later and all levels were exactly the same
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post #4 of 5 Old 08-13-2019, 5:48 AM
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Re: Unexplained coolant leak

With the recent warm weather older radiators are getting found out. Mine started getting too warm at town speeds, the fan would cut in and not get it back under 102C until I could speed up and get more airflow through the rad. so I changed the radiator for a new (copy) version. Problem solved. I don't know if you noticed what the temperature display was telling you, but it could be that your system boiled, blew itself out through the expansion tank (and hence the coolant on the right side, same side as the blowout pipe from the expansion tank). some then got sucked back into the system when it cooled, emptying what remained in the expansion tank. Maybe the fins on your rad are bent obstructing flow, maybe the thermostat is not opening fully - but they are pretty reliable. I'd look at the state of your radiator and decide based on that. Could also be that the pressure cap is letting go at too low a pressure, but that's unlikely. A few ideas for you anyway.
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post #5 of 5 Old 08-13-2019, 3:13 PM Thread Starter
 
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Re: Unexplained coolant leak

Appreciate that. Investigation ongoing...
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