Strange overheating issue - Help needed
I can't believe that I have not been on this forum since 2014. Time flies when you are having fun.
I have a good one for the 10R gurus.
Wife has an 08 10R, stock except for a slip on exhaust. Miles are below 10k.
Bike runs great except.....when sitting in traffic or at a light after riding a while (30 mins), then temp gauge will climb to display "Hi". Prior to reaching this point, the temp readings will jump around reading 205, 212, 202, 219, 225, 235, 218,. etc. They seem to change or update every 2 seconds. Once you start rolling when the light turns green, the temps drop quickly back to normal until you get to the next light. The fan operates normally.
I initially thought it was a thermostat which I changed. I made certain to reinstall it with little hole up. I then replaced the temp sensor under the throttle bodies in the head. I then replaced the radiator cap. I then pulled the water pump which appears to me to be ok.
I did not that when I drained the coolant to change the temp sensor and check the water pump that only about 2 quarts of coolant came out each time. Both times, I drained while bike was up on a rear stand.
**Should more coolant have drained out? When I refilled, I filled both the radiator and the reservoir. I also noticed that the coolant reservoir is always full not matter when temp the bike is running.
**Is there a way for the radiator to have coolant up to the filler neck and the reservoir to be full, but the coolant "system" not have enough coolant?
**Could I have an air pocket somewhere which is causing the problem?
I have read some posts stating that these symptoms could be air pockets, not enough coolant, head gasket, and radiator cap.
What test can I do to eliminate the remaining since I have already changed a few things? I have never seen a temp gauge bounce around like it is doing. I am thinking this is a good clue to the cause but I am not sure what? I have a video of the gauge jumping but I am not sure how to share it.
Any and all help will be greatly appreciated.