OP states cap has been replaced. I still question how the head gasket was eliminated as an issue?
Yes cap has been replaced. Head gasket has not officially been eliminated except that I have no other issues. No smoke, engine runs smooth (other than chudder), no coolant leaking, nothing.
If it was something with the cap or radiator, would I get bubbles in the overflow right away? Mine takes 10 to 15 minutes before it starts bubbling.
Aargh, sorry -- I completely missed that. As I was skimming through, I kept wondering "why doesn't he try a new radiator cap?"
Never mind. Carry on. My apologies.
One thought: there is a gadget common in car shops (maybe not common in motorcycle shoppes) that can sniff exhaust fumes in coolant to diagnose a head gasket leak. Perhaps you could persuade a friendly car mechanic to take a whiff.
So I'm not a strom owner but on my tl1000s it was a complete pain to burp the cooling system otherwise it would do similar symptoms. I remember one thing I did to fix the issue was loosening a bolt on the water pump while going through the bleeding process. This was in the manual for my tls and hope my post helps you
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Finally got my bike back from a new mechanic (I didn't have much faith in my old one). Turned out to be the water pump. I was starting to loose fluid from the overflow coming off the water pump. Mechanic did say that bubbling in the overflow tank is normal. I asked him a number of times if that is true and he swore that bubbling is normal but going up to 4 bars is not. Rode it home today and stayed at 2 bars the entire time and there was bubbling in the overflow.
That's great the overheating is fixed. I wonder if you just need to purge the system again. My Vee has never bubbled in the over flow that I have noticed. I may be wrong- but I would only think that was normal if there was air trapped in the system.. Maybe it doesn't hurt anything, but odd for sure..