Of course the other thing with heat is the hotter the engine gets the less fuel it tends to require.

You said the other own had increased the pilot jets. It's rather uncommon to do that unless your'e running premix.

I would try dropping the pilots back to stock and see how it runs then. Even though you say you swaped the carbs onto another bike. Each and every engine is different.

We often drop pilot jet sizes on stockers/lightly mod'ed ones.
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If I have to take the carbs off once more...