Probably the clutch is a bit sticky. This could happen for a number of reasons, but most common are the folowing:
- It's not ajusted very well. The cable should have about 5 mm free play. Then it should disangage the clutch. With a disangaged clutch there should be some more handle-movement possible.
- The wrong oil is in the engine. Check out what kind of oil you need. With bike's this is very important since the clutch is in this oil. If it's to thick, the clutch won't disangage (especially when the engine, and the oil, is cold)
- The inside of the clutch-disangagement-system is not functioning. Open the clutch-cover and make sure it's function's correctly.
I would guess in your case it's number 2.