I have gone through this motor more times than i would like to mention. :-X I can get it started but can not keep it running long enough to try adjusting anything. only starts half choked and run 10-20 seconds. full choke it dies, no choke it dies, advance throttle it dies. i have cleaned carbs 3 times. i have ensured spark by grounding plugs on block. i have run a modified cup with fuel line nipple and hose straight to carb inlet to verify its not the fuel pump. to me it seems running to lean due to me having to choke it. i have richened it with the adjusting screw on carb with no luck. anyone have any other tips or suggestions??