start problems when it´s hot

Blue bandit

New member
Having trouble with starting my honda gx270 when it´s hot.
what do you think is my problem guys?

specs about the engine;
increased compression
arc flywheel
timing at 28degree (UT1 old coil)
autolite 3910x sparkplug
stock carb at gas (octane 95) and airfilter assembly
custom camshaft close to nr280-rpm
 
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