V4RG build

[Motosurgeon]

Went for a long ride yesterday. Temps between 75 and 85F. Bike got hot enough to boil over. The reservoir catch can was removed so it spilled out of my vent. Not sure how much coolant I lost but I think I had enough to finish the rest of the ride. I was surprised that the coolant was boiling at around 235F. I feel like this could be due to the VP Stay Frosty lower boiling point. I am considering getting a different radiator cap but not sure if anyone else has tried this and if I should be cautious about any aspect of the modification. I have the samco thermostat delete hose kit but am more concerned about the coolant temp sensor o-ring failing. Should I pressure test the system to see if the higher pressure would cause a leak? Should I just stop riding my track bike around town during the summer? We'll see if there is anything to learn from this. For now I'll top off the coolant and retest when it cools down a bit more. Here is a random picture I found that shows the reservoir/vent setup.

 

[BMW Alpina]

Something must be wrong, maybe the flow of coolant was partially blocked, or the coolant mixture is incorrect, or the flow of air to the radiator was blocked somehow... Also changing radiator cap to larger pressure should not have any bad effect.
Maybe start with changing the coolant with normal regular Ducati recommended coolant (or any automotive coolant), with the correct coolant vs water mixture.

 

[HKMP7]

I concur because riding in AZ in 115 degs my bike doesn’t mind it at all.

 

[Motosurgeon]

I concur because riding in AZ in 115 degs my bike doesn’t mind it at all.

From what I can tell the bike is not running any hotter than before.
It has been up to the 4th bar heat range when in traffic. The only change is VP Stay Frosty coolant which has a much lower boiling point but should otherwise help the bike run cooler.
250F vs 400F is my guess depends on the system pressure.
I have deleted the fans so that probably doesn't help when I have to pass through a 15 mph school zone, 20 mph small town, or the occasional red light.
Bike runs normal temps on track and on the open road.