I thought I would share this repair as some may find it useful. The first photo shows the state of the thermostat on the paso I am currently reinstating. As you can see the steel ring has corroded and allowed fluid to leak. I did pick up a second hand aprillia thermostat and planed to mess around with the pipes to make it fit but when I noticed the steel ring was starting to corrode and I figured soon enough this would also fail. I have a lathe so decided to make a ring to replace the old one. See photo for dimensions if you have a lathe or a friend that does. Note the dimension x is not important - a few mill is good. I then sealed the gap between the two halves of plastic with high temperature auto motive silicone sealant. ( I used the expensive German brand - beginging with W I think?)
I then carefully peaned the edges down with a small hammer ( also filled the void with sealant).
Finally I clamped the ring in the vice going around progressively clamping the whole thing together. I have only had it running for about ten minutes in the garage but so far it's working OK. I will report back later after I have used it in anger for a bit longer. Now back to getting her running as after 5 minutes of clean running she is spluttering! One step forwards two steps back.
Hope this helps and keeps a few more running!
Keith mm in SE London village.
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