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Thank you for jour reply Dirk,

I started the engine without airfilter to be sure that this was not the problem.
Spark plug i didn't checked yet. Are there any signes where i should look at?
Spark gap, color etc?
The sparks itself looks healthy.

Valve clearance was last checked less than 1000km ...

Hello all please help me
My xf650 starts OK when motor is cold but after a few minutes stops.
I noticed some smoke just before stopping, problably from the tube that comes from the carburators and Just hangs down (not connected to anything )
When motor is warm the engine stalls and can not be ...