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basically the oil in the primary is still "cold", thus it has a higher co-efficient of friction.
Thus even though the clutch lever is pulled in and the clamping force has been removed from the plates and discs, they are essentially still meshed together as the oil is acting like a glue between them. Thus the lurching symptom.
also it may be time to readjust the clutch.
I can't help but laugh when i read choochoos answer. No offense choochoo but after reading normal, normal, normal, then you get a detailed explanation of what is really happening i found that a little funny. True, But funny.
Sorry Choo to bust your bubble but the co-efficent of friction does not change.... The VISCOSITY changes hence thickens when cold and thinner when hot.
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