Author Topic: Leaking coolant when bike is sitting still  (Read 493 times)

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Offline Derick

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Leaking coolant when bike is sitting still
« on: January 09, 2020, 03:19:29 pm »
Hey all, I am in pre-troubleshooting mode here...in 2018 I replaced all the coolant lines and my tstat, and tstat gasket on my 06 while the carb was out at steves. All was well.

I cant say that I rode much in 2019, but I've been trying to get her out lately and I am finding I have a coolant leak. It appears that when the bike is cool and/or in motion, there's no leak. If you let it sit, and get hot [and I assume when the tstat opens] it starts to leak coolant pretty heavily.

Am I correct in thinking that perhaps the tstat housing just needs to be re-sealed? On my project 2002 that I replaced the tstat on as maintenance, I dressed it up with a fair smear of black RTV (I just didnt really care about that bike). On my 2006, all I used was the new rubber gasket that I got from murphs......should I have taken that extra step and used some coolant friendly RTV?
« Last Edit: January 09, 2020, 04:26:47 pm by Derick »
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Offline Bob_C_CT

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Re: Leaking coolant when bike is sitting still
« Reply #1 on: January 09, 2020, 08:50:21 pm »
I didn't use RTV when doing my t'stat r&r.
Are you sure that one of your hose clamps hasn't gotten a little loose. That happened to me a few months after replacing all the hoses with new ones. Be careful coolant is very slippery on the tires if you get a failure on the road in motion.
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Offline Derick

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Re: Leaking coolant when bike is sitting still
« Reply #2 on: January 10, 2020, 01:53:40 am »
I didn't use RTV when doing my t'stat r&r.
Are you sure that one of your hose clamps hasn't gotten a little loose. That happened to me a few months after replacing all the hoses with new ones. Be careful coolant is very slippery on the tires if you get a failure on the road in motion.
Honestly, that would be the best case scenario...I have to take off the tank and plastic and actually diagnose it. Just running through the thoughts running through my head.
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Offline cra-z1000

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Re: Leaking coolant when bike is sitting still
« Reply #3 on: January 10, 2020, 02:33:48 am »
I've always had to go back and tighten hose clamps awhile after hose changes . Some swear by the spring type hose clamps for this reason .
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Offline Derick

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Re: Leaking coolant when bike is sitting still
« Reply #4 on: January 10, 2020, 03:12:46 pm »
I've always had to go back and tighten hose clamps awhile after hose changes . Some swear by the spring type hose clamps for this reason .
I tried, but i could not for the life of me find em. I generally dislike the cranking hose clamps, but that's all I can get around here.
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Offline Daytona_Mike

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Re: Leaking coolant when bike is sitting still
« Reply #5 on: January 10, 2020, 03:22:01 pm »
Are you saying that you replaced your coolant log 'O' rings?   I guess we need to find out exactly what is leaking.
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Offline Derick

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Re: Leaking coolant when bike is sitting still
« Reply #6 on: January 10, 2020, 03:52:11 pm »
Are you saying that you replaced your coolant log 'O' rings?   I guess we need to find out exactly what is leaking.
Everything rubber was replaced. I have had weepy log orings before after a long sit... they kind of re-seal themselves after getting hot again. I did check under the log and that's not where it's leaking, so I think we're good there. Again this is pre-teardown thought combing.
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Offline JS

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Re: Leaking coolant when bike is sitting still
« Reply #7 on: January 13, 2020, 05:18:02 am »
Remove the lower and side fairing and ride it around as a half naked Connie. Helps spotting leaks, etc. Also the overflow bottle can have a crack, etc. If draining the system make sure to get all the air out before a ride. The vent by the thermo may not get the job done.

Offline Boomer

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Re: Leaking coolant when bike is sitting still
« Reply #8 on: January 13, 2020, 09:38:25 am »
There are 4 points it could be coming from around the thermostat housing.
1- The rubber o-ring that seals the housing to the coolant log.
2- The gasket between the 2 halves of the housing.
3- The hose that links the housing to the coolant filler.
4- The temperature sensor.
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Offline Derick

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Re: Leaking coolant when bike is sitting still
« Reply #9 on: February 22, 2020, 10:08:12 pm »
As always the experience and wisdom here led me to the correct action of repair. Theres no joke when you guys say the hose clamps back off. All of mine were barely hand tight. I think the one that was the culprit was the right side radiator entry joint. But it gave me time to tighten them all down. Jeez. Guess that will be on my annual maintenance checklist. (that I didn't do last year lol)
« Last Edit: February 23, 2020, 12:59:17 am by Derick »
Current Bikes:
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Offline Boomer

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Re: Leaking coolant when bike is sitting still
« Reply #10 on: February 22, 2020, 10:29:57 pm »
Glad ya found it 😁
George "Boomer" Garratt
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