extra expansion tank (coolant)

Pretty sure you can remove the L/H one without any issues. Mines never had any coolant overflow in it ever.

The new bikes have the V pipe allegedly plumbed into the left tank

Astral11 said:

More interesting old posts - V4 removing evap, overflow pipe, tank pressure and relief valve ball

And like I said, from experience I haven't had an issue with the coolant system after tank removal, but everyone has their opinions. Has there been a real instance of a blown head gasket from a 2.0 cap? I doubt it

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It's not the cap, it's the amount of heat and pressure that the system will see if something goes wrong. There's a reason they put a 1.6 cap on. They wanted it to be puking water on your leg before the motor checks out (apparently they were not always successful at this). I went the other way to a 1.1. It's never opened either. I watched the initial waterpump failures when the motors were putting water into the oil (this disappeared after the first revision now they just leak to the outside). Totally pressure related. Once the pumps start to leak only fix is new pump (you can change the seal maybe if you can find one). When the system pressure exceeds the ability of the seal to retain it, bye, bye. As an experiment pull the connectors to the fans, and let the motor idle until either the cap opens or the head gasket goes. If you're lucky the pump will check out first. Or maybe a hose will blow off. Regardless the heads will be useless as you've just annealed them. A little research into current aluminum casting heat treatments versus what Ducati already allows in engine temps might be enlightening.

baggerman said:

I went the other way to a 1.1.

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Didn’t you try a .9? Was that too low?

The 0.9 opened during hot soaks so I went to the 1.1. I ran it all summer all good. Last thing I need is a waterpump failure in bumf--k...

baggerman said:

The 0.9 opened during hot soaks so I went to the 1.1. I ran it all summer all good. Last thing I need is a waterpump failure in bumf--k...

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So excessive pressure causes the water pump seal to fail?

It can.

baggerman said:

The 0.9 opened during hot soaks so I went to the 1.1. I ran it all summer all good. Last thing I need is a waterpump failure in bumf--k...

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Where can I get a cap like yours?

I would think any 1.1 bar cap for a small radiator (motorcycle) should work.

SirJAG said:

Where can I get a cap like yours?

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It's a regular stant or motorad. Doesn't have a part # on the cap unfortunately. It's posted on here somewhere I'll look.

bp_SFV4 said:

I would think any 1.1 bar cap for a small radiator (motorcycle) should work.

Amazon.com

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You actually have to measure the neck and the engagement depth but that's all.

Stant 10233.