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If the engine will run for twenty mins then just stops it may be worth checking the air vent to the fuel tank. Dirt bikes often have a small plastic tube fitted to the petrol cap to allow air into the tank. Sometimes the tiny hole in the fuel cap ( Which most bike have) gets blocked and the engine will run until such time as the vacuum in the tank stops fuel coming through. Got to be worth a check.
I would recommend that you check the main fuses located somewhere near or behind the sidecovers on either side of the motorcycle, If that is unsuccessful...You know, fuses are okay looking, then at that point check the electrolytic acid level in the battery. (usually located under the seat or behind the sidecovers as well). If the battery acid level is too low the engine will not run properly and if it is super low you will not even have enough energy to create a spark.
Is there oil in the gearbox? Is it really dirty? Lack of oil and dirty oil could account for the clutch problem. If you have put synthetic lubricant in the gearbox that could also account for the clutch. Synthetics can swell the cork on the clutch plates. New fiber plates would be needed.
The shifting problem could be tied to the lack of oil or dirty oil but usually the problem is bent shift forks. If fresh oil doesn't fix the clutch the clutch will need to be inspected/repaired. If that doesn't also fix the shifting, ( and I don't think it will ), the engine will need to be torn down and the shift mechanism inspected. Forks will likely need to be replaced.