Noticed today that after a hard commute when parking up I could hear what I assume to be boiling or bubbling coolant in the expansion tank near the headstock. The expansion tank was replaced last year as it had cracked and leaked, and I have not been aware of issues since that took place. I had thoughts of it being either a radiator, thermostat or water pump issue but thought I would see what the collective knowledge was around any likely or known issues!
What temperature did you have showing? I'd expect to see a warning light before you heard any bubbling and if it was over pressure, it would have been venting.
That's a good question! no temperature warning at all, and I can only recall peaking at the 106c-108c range during the ride, but cooling down on more open roads
Could it not just be the sound of the coolant running into the expansion tank as it does what it’s supposed to in dealing with the increase/decrease in volume as the coolant expands & contracts. Under pressure if about 1 bar the coolant shouldn’t reach boiling point until around 128c
Then I wouldn't worry and would check the level whilst cold and if good, ride it and keep an eye on it. Maybe an idea to vent it whilst you have it cold.
Just spent some time fettling and found the fault I believe - one of the two radiator fans were bound by one of the evap hoses. This was preventing the fan from spinning so stopping the bike from shedding enough heat. Sorted that now so hopefully that should be a fix
Fairly "normal" in Ducati terms .......... ( depending on circumstances ). Example - city centre traffic in Sevilla , in July . I just got used to it as part of regular driving ..... gurgling noises , fans on continuously etc. What surprised me was rarely having to top-up the coolant . By the time I was 10 miles from the city , it had mostly back-syphoned from the expansion tank into the radiator . If no coolant is dripping out anywhere ? .... Happy Days !
The same happened to me on 2014 Monster 1200. I exchanged the radiator cap to new and bubbling issue got solved.
Get rid of the EVAP unit entirely, it's nothing more than excess weight. You can get the delete kits from HERE. It's a simple job and I found my 1260 (with up map) actually ran better at lower rpm. Enough to notice a back to back difference? Probably, enough to notice a change in performance? Not that I'm aware lol. But worth doing as overall I think it's around 400g of saving. Be warned, if you do the job, you CAN remove the tank fairing without removing the fuel cap, which if you try to take both off without unhooking the 2 hoses from the cap, you'll have a bad time. Ask me how I know.
