Nigel could be right...
As the components heat up they can start to perform badly if they have a fault. Ignition coils are the usual culprit and the regulator/rectifier.
You say it has NEVER been right ?? Did you buy it second hand with this problem ?
It it runs perfectly for 30 mins of normal riding, I think you can pretty much rule out incorrect jetting or mixture.
FYI, choke on a hot bike will only make things worse... (or it should do).
When the float valve was cloggod on my XT600E, it would only run on the choke as it was a seperate input.
Do you have the tools and means to check your coil and regulator ???
Does the starter motor turn over strongly at ALL times ???
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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