'00 RC51 leaking coolant like MAD - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 11 (permalink) Old 08-06-2010, 12:50 PM Thread Starter
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'00 RC51 leaking coolant like MAD

I'm a local shade-tree mechanic, so I get lots of bikes on the lift, so I get a lot of stuff I've never worked on before from '40's Indians to modern Trials and MX stuff.
Maybe you guys (gals?) can start me looking in the right direction before I start stripping this thing down.
All the owner told me is it pushes out coolant at a very high rate, but only when RUNNING.
He borrowed a pressurizer and the system held steady at 20psi for several hours.
Any ideas?
Thanks!
Charlie
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post #2 of 11 (permalink) Old 08-06-2010, 01:00 PM
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Has the bike been dropped on either side? Was it exposed to salt roads per chance?
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post #3 of 11 (permalink) Old 08-06-2010, 01:52 PM Thread Starter
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This bike has definitely been down on the left side at some point and it doesn't seem like it's been corroded from road salt.
I wonder if there's an internally blown head gasket that's pressurizing the cooling system.
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post #4 of 11 (permalink) Old 08-06-2010, 03:55 PM
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If it's a blown head gasket, a compression test should find which cylinder.
Also is the oil creamy looking or normal?
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post #5 of 11 (permalink) Old 08-06-2010, 05:00 PM Thread Starter
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I still have to look at it.
I don't know what the compression is supposed to be, but I can compare the 2 cylinders.
And, yeah...I'll be checking the oil.
I was mainly checking in with y'all to see if there's anything peculiar to this bike that would cause the problem.
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post #6 of 11 (permalink) Old 08-06-2010, 07:09 PM
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With two radiators along with connecting hoses, the most common problem is leaks when the hoses age. Generally with the left radiator for whatever reason.
Probably due to the bike leaned to the left on the side stand.
And if the bike is laid down on either side, the radiators are vulnerable to damage.
But blowing coolant out somewhere is not common.
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post #7 of 11 (permalink) Old 08-06-2010, 10:47 PM Thread Starter
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Stuff is squeezed in there pretty tight, eh?
I'm not too used to faired bikes.
Too damn many fasteners!
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post #8 of 11 (permalink) Old 08-06-2010, 10:53 PM Thread Starter
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What about the water pump?
It doesn't appear to have a weep hole.
If the seals were gone, where would the coolant go?
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post #9 of 11 (permalink) Old 08-07-2010, 06:05 PM Thread Starter
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Thanks, y'all. Got it sorted. Quite simple...the owner just didn't bother to remove the airbox and get a good look at everything.
An over-tightened worm clamp cut a hose.
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post #10 of 11 (permalink) Old 08-07-2010, 06:07 PM Thread Starter
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BTW...how to check the oil level?
Is that small one on the left a level plug?
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