[gport]

I purchased a non-running gk-13 last week & cannot get it to start. I have replaced the following items either because they were bad and needed replacing or as part of my troubleshooting process: head gasket, starter, carb, choke(getting voltage), spark plug, water pump & other non important stuff. Whenever I place my hand over the intake it starts & runs rough for about 30secs. When I dont have my hand over the intake it takes about 10 secs to start & dies immediately. I also noticed that when I changed spark plug it started right up for a minute then died. Also, when i removed tube from top of valve cover, which goes to a T, it made a sucking noise for 3 secs, replaced hose & started right up again for a minute then died. The other hoses coming off of that T goto the case that has stator inside & a small box on air filter that has all holes plugged. I also put piston at top & made sure lines on sprocket for cam were horizontal. I am also getting spark at the plug. Any suggestions?