dictater Posted October 22, 2017 Share Posted October 22, 2017 Hey all I noticed a couple weeks ago a slow coolant leak from the overflow tube on my CBR 250. It got worse, I filled the reservoir and within a few days it was empty again I just filled it with water and it just pissed it out dry, the bike is cold, haven't ridden since yesterday. My mechanic said he thought it was a blown head gasket but why would that affect the coolant from the reservoir, on a cold nonrunning bike. Obviously, I am ignorant of the cooling system but does anyone have any opinions on this before I let him operate? Also, the bike is not running hot when I ride it and the coolant level in the radiator remains full. Link to comment Share on other sites More sharing options...
Kwasaki Posted October 22, 2017 Share Posted October 22, 2017 12 minutes ago, dictater said: Also, the bike is not running hot when I ride it and the coolant level in the radiator remains full There's lies your answer, my guess is the tube from the coolant reservoir to your rad is leaking. Get a opinion from another mechanic if you can find a mechanic. Link to comment Share on other sites More sharing options...
dictater Posted October 22, 2017 Author Share Posted October 22, 2017 Definitely not leaking from the line to the rad, leaking from the overflow tube. Link to comment Share on other sites More sharing options...
sirmud63 Posted October 22, 2017 Share Posted October 22, 2017 head gasket for sure . you could try some barrs leak ,just for a quick stop .but wont last long . get your mechanic to pressure test the cooling system, just to prove it . Link to comment Share on other sites More sharing options...
dictater Posted October 22, 2017 Author Share Posted October 22, 2017 That's good to get some confirmation but why does it just drain out when it's not running? I filled it with water this morning and it poured out of the overflow as fast as I put it in? Link to comment Share on other sites More sharing options...
VocalNeal Posted October 22, 2017 Share Posted October 22, 2017 So just to be clear you are filling to the line the overflow tank #12 and when the engine is not running the water is leaking out of hose # 24 Link to comment Share on other sites More sharing options...
sirmud63 Posted October 22, 2017 Share Posted October 22, 2017 2 hours ago, dictater said: That's good to get some confirmation but why does it just drain out when it's not running? I filled it with water this morning and it poured out of the overflow as fast as I put it in? where are you filling it from ? the tank or rad? Link to comment Share on other sites More sharing options...
kaorop Posted October 22, 2017 Share Posted October 22, 2017 2 hours ago, sirmud63 said: where are you filling it from ? the tank or rad? Ah fixing a mocy by conversation, always good for a laugh. No disrepect, just its always frustrating and often futile.. Link to comment Share on other sites More sharing options...
VocalNeal Posted October 22, 2017 Share Posted October 22, 2017 43 minutes ago, kaorop said: just its always frustrating and often futile.. Add to that one usually never gets to find out what actually the problem was. Link to comment Share on other sites More sharing options...
Kwasaki Posted October 23, 2017 Share Posted October 23, 2017 14 hours ago, VocalNeal said: Add to that one usually never gets to find out what actually the problem was. Also not making any sense, good illustration by the way good info. Link to comment Share on other sites More sharing options...
VocalNeal Posted October 23, 2017 Share Posted October 23, 2017 1 hour ago, Kwasaki said: Also not making any sense, good illustration by the way good info. My question was rhetorical but lets see what the outcome is? Link to comment Share on other sites More sharing options...
Kwasaki Posted October 23, 2017 Share Posted October 23, 2017 2 hours ago, VocalNeal said: My question was rhetorical but lets see what the outcome is? Well i think the hose is buggered at No.23 or the coolant bottle is broke. If OP can run with no overheat it's not a head gasket. Has he looked at oil another give away of of coolant leaks. Link to comment Share on other sites More sharing options...
VocalNeal Posted October 23, 2017 Share Posted October 23, 2017 Persacaly. Link to comment Share on other sites More sharing options...
dictater Posted December 12, 2017 Author Share Posted December 12, 2017 On 10/22/2017 at 6:12 PM, VocalNeal said: So just to be clear you are filling to the line the overflow tank #12 and when the engine is not running the water is leaking out of hose # 24 I kind of let this conversation go as it descended into normal TV nonsense, but yes you are correct. I have since posting replaced the manifold gasket and now find the bike draining more than before. Only when the engine is cool after a ride, meaning usually overnight so I never actually see it happening. I replaced the gasket two weeks ago and the reserved tank is now nearly empty. Link to comment Share on other sites More sharing options...
dictater Posted December 12, 2017 Author Share Posted December 12, 2017 Just now, dictater said: I kind of let this conversation go as it descended into normal TV nonsense, but yes you are correct. I have since posting replaced the manifold gasket and now find the bike draining more than before. Only when the engine is cool after a ride, meaning usually overnight so I never actually see it happening. I replaced the gasket two weeks ago and the reserved tank is now nearly empty. Link to comment Share on other sites More sharing options...
VocalNeal Posted December 12, 2017 Share Posted December 12, 2017 So the contents of the overflow tank are all over the floor? In the morning the o/flow tank is empty but the radiator is still full? In theory it can't siphon back into the engine if the radiator cap is good as it would act as a non return valve. Pinch off hose #25 and blow down hose #24 see if the tank has a crack/leak in it which has been suggested. Check the dipstick is there water in the oil. This has also been suggested. My Honda has a pressurized head tank not an o/flow tank so has no spring loaded radiator cap. Link to comment Share on other sites More sharing options...
canthai55 Posted December 12, 2017 Share Posted December 12, 2017 If there are no obvious signs externally of a leak, it must be eating it. Head Gasket possibly. Find a place that can pressure test the cooling system and it will be obvious. Link to comment Share on other sites More sharing options...
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