Coolant leak, noob status - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 13 (permalink) Old 12-19-2013, 06:09 PM Thread Starter
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Coolant leak, noob status

I was warming my up Rc for the first time since June of this year, and when I came back to my bike, I found a rather annoying coolant puddle freshly leaked from the left side.

Is it a loose hose? Do I have to take the radiators out to look into my problem? Here's a pic

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post #2 of 13 (permalink) Old 12-19-2013, 06:33 PM
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I had a similar problem when I first got my SP1. Rode it around, no issues. Did a start-up one time, then noticed a small leak. Turned out to be a slightly loose connection on the upper hose. Few turns with a screw driver, no issues afterwards.

Check all the connections, and check the hose for cracks.

2001 SP1 (sold)
2004 SP2 (properly stored)
2012 Ruckus (stolen)
2015 Grom (under construction)

Weyrauch pronounced (Y Rock)...Rock for short.

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post #3 of 13 (permalink) Old 12-19-2013, 06:38 PM Thread Starter
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Originally Posted by weyrauchrc51 View Post
I had a similar problem when I first got my SP1. Rode it around, no issues. Did a start-up one time, then noticed a small leak. Turned out to be a slightly loose connection on the upper hose. Few turns with a screw driver, no issues afterwards.

Check all the connections, and check the hose for cracks.
Should I take the radiator off or would that be a problem?
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post #4 of 13 (permalink) Old 12-19-2013, 06:44 PM
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Should I take the radiator off or would that be a problem?
With all the fairings off you shouldn't have to do that to at least visualize all connections.
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post #5 of 13 (permalink) Old 12-19-2013, 06:46 PM Thread Starter
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With all the fairings off you shouldn't have to do that to at least visualize all connections.
Can't seem to find much, if the issue is only to be a hose/connection. It drips from the bottom right corner of the radiator itself
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post #6 of 13 (permalink) Old 12-19-2013, 07:17 PM
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Can't seem to find much, if the issue is only to be a hose/connection. It drips from the bottom right corner of the radiator itself
Hmm, well if it was me I guess I'd try and dry everything off as best I could and continue to try and find the source. Even unbolting the radiator doesn't give you much play, it's pretty well secured in there just by all the hose connections.
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post #7 of 13 (permalink) Old 12-19-2013, 07:39 PM
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Should I take the radiator off or would that be a problem?
I wouldn't take off the radiator, like already stated...dry everything off then run the bike.

This should help identify the leak. I thought the same thing with my leak (looked like it was coming off the bottom corner), but after I dried everything I noticed it was coming from the upper hose connection.

It was dripping from the upper hose, then running down the radiator and dripping off the corner (sounds similar to yours).

I venture to say, if you look at the upper hose (by your blinkers) you might see some coolant.

Dry, run, check.

Just my thoughts.

2001 SP1 (sold)
2004 SP2 (properly stored)
2012 Ruckus (stolen)
2015 Grom (under construction)

Weyrauch pronounced (Y Rock)...Rock for short.

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post #8 of 13 (permalink) Old 12-19-2013, 07:42 PM Thread Starter
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Originally Posted by weyrauchrc51 View Post
I wouldn't take off the radiator, like already stated...dry everything off then run the bike.

This should help identify the leak. I thought the same thing with my leak (looked like it was coming off the bottom corner), but after I dried everything I noticed it was coming from the upper hose connection.

It was dripping from the upper hose, then running down the radiator and dripping off the corner (sounds similar to yours).

I venture to say, if you look at the upper hose (by your blinkers) you might see some coolant.

Dry, run, check.

Just my thoughts.
Awesome, will do and I will give an update as soon as I can do it. Thanks!


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post #9 of 13 (permalink) Old 12-19-2013, 09:15 PM
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Quote:
Originally Posted by weyrauchrc51 View Post
I wouldn't take off the radiator, like already stated...dry everything off then run the bike.

This should help identify the leak. I thought the same thing with my leak (looked like it was coming off the bottom corner), but after I dried everything I noticed it was coming from the upper hose connection.

It was dripping from the upper hose, then running down the radiator and dripping off the corner (sounds similar to yours).

I venture to say, if you look at the upper hose (by your blinkers) you might see some coolant.

Dry, run, check.

Just my thoughts.
I concur.

My leak was also from a upper hose, but on the right, throttle side.

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post #10 of 13 (permalink) Old 12-19-2013, 09:21 PM
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Ram, I forget, is yours SP1 or SP2? SP1's are somewhat notorious for the front top left radiator mount to vibrate and cause a pinhole in the top row of the radiator. Mine gave out after I hit about 25,000 miles. It can't really be repaired, I had to replace it with a good radiator I found here on the forum.

I hope it's only your hoses, or your overflow bottle. You should remove your left side fairing and take a good look at the rad, hoses, overflow bottle, and it's hoses.
Go one step further, and remove the right side fairing so you can inspect and clean the hoses and clamps on that side to. If you gently tug at the right corner of the front fairing, you can access the radiator cap and inspect that too. Then go ahead and run the bike to warm it up and keep an eye on all the connections before you reinstall the plastics.

John, 2000 RC51 #000100

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