My last siezure happened when the cooling hose fell off. The one before because I didn't rejet when I moved from a track at 26 degrees, to one at 12.

I don't run a thermostat, but moistly cuz there wasn't one fitted when I bought the bike.
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball