Twostroke Junkee Posted February 25, 2012 Report Share Posted February 25, 2012 my sons 7mm cub leaks coolant out through the radiator overflow. i've never thought that this could be such a big issue, as most of time time you replace the orings and its fixed, sometimes the radiator cap. so far i've tried. - new orings 2 times -3rd time i pulled out the head and the orings were good but it was still leaking through the overflow -new radiator cap I then said heck with it, i got a brand new noss head, new orings.. well i took it out last week and it still leaks through the overflow, especially when i give it some throttle it literally shoots out when im cleaning it out when im staging and all the way through the run. The water stops leaking after i lose about a water bottle and a half of water, but when i add it back in it starts to leak through the overflow again.. there was no water shooting out of the pipe at all. Even when i lose a bottle and half of water the bike doesn't overheat at all, i could still run the bike.. the water temp stays at 120. Another thing. When i first bought the bike the top radiator hose was plugged into the waterpump cover and the bottom radiator hose was plugged into the head. I changed it because i usually run my hoses vise versa. Could this be an issue? My timing is +8, compression 170ish bike runs on alcohol. I'm out of ideas. Quote Link to comment Share on other sites More sharing options...
notsed Posted February 25, 2012 Report Share Posted February 25, 2012 well if you dont have a coolant overflow bottle then you will spit some out ass the bike heats up do to expansion. once it stops and if it doesnt overheat then that is the proper level it needs, i wouldnt worry about it Quote Link to comment Share on other sites More sharing options...
Twostroke Junkee Posted February 25, 2012 Author Report Share Posted February 25, 2012 I have 2 other drag bikes a 16mm and a 10mm and both of the radiators are filled to the top, with no issues. Quote Link to comment Share on other sites More sharing options...
notsed Posted February 25, 2012 Report Share Posted February 25, 2012 mine always spits about a water bottle full out if i fill to the top, same with my buddies. if there was a problem with the seal on your head i wouldnt think it would stop coming out and it would eventually overheat. also could be a broken water pump or cracked cylinder too i guess. im no expert by any means im sure someone else will have better input but i would giver and just keep an eye on it. if your worried do a comp and leak down test and check the impeller Quote Link to comment Share on other sites More sharing options...
Bkm2006 Posted February 26, 2012 Report Share Posted February 26, 2012 i top mine off before i go on a ride , and it always leaks a little when warming up.. Quote Link to comment Share on other sites More sharing options...
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