Bike would not run without compression--du u hav enuff oil in the crankcase to lubricate piston-cud also be a problem with low speed carb setting
First , check your compression with a compression tester. It should be at least 100 pounds pressure just to run. Preferably 120,130,140,etc.. Some motorcycles have a decompression cable that works off the kick lever, others have a decompression lever you hand operate. I believe yours is hand operated . I think the actual lever in the valve cover on top of the motor is sticking or the decompression cable itself is hanging up and not allowing the exhaust valve to close properly.
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