[sbdrums24]

I'm not sure whats wrong with this motor, I know the head gasket is bad but.... The radiator had a hole worn in the bottom by an aluminum radiator shroud and she leaked all the fluid out without me knowing. As I rode I starting smelling antifreeze and the bike wanted to idle at 4000 RPM revving up and down so I shut it down right away. The engine never seized or anything but is leaking antifreeze out of the top of the Pro Class removable dome. Is this a normal sign of a bad head gasket/overheating? The bike also appears to have air blowing through the reservoir. The head gasket consists of 2 thin rubber rings and one is gone. Is that all there is to the head gasket and does CT sell the gaskets or does anyone else? I also replaced all the water pump components after this happened, they were working but I replaced them anyway. Any help would be great. Thanks.

 

[2R's]

yes what you are describing is a motor that got too hot .it got hot because the coolant was low or gone ..the excess heat ruined the o rings & the head moves around faster then the cylinder this ruins them too ...the air is from the head leaking pressure into the cooling system ...
I would probably remove the cylinder & head & make sure the bore is OK & remove all signs of coolant from cylinder & lower bearing
if the cylinder is ok put a good coating of oil all over the cylinder & lower bearing before re assembling it,then make sure the head is flat then fix the radiator & replace the o rings

 

[C-Leigh Racing]

When that top end got hot enough to melt the inner o ring, you can just about be sure you have some amount of damage. I wouldnt be afraid to say that the head & maybe even the cylinder itself is deformed to some extent. It dont take alot of heat while a engine is running for this to happen.
Probably be best to get the head & cylinder checked for straightness.

I've got o ring sets, but you would be taking a chance just putting it back together like it is.
Neil