Check the spark arrestor screen in the muffler, filter in tank and make sure you didn't overlook the small screen in the inlet side of the carb. Make sure the carb diaphram is good.
It can appear normal and be stiff.

Good Luck,

Ray

I have checked the exhaust sytem and it appears normal. I would like some information regarding carb parts or repair kit. It has a zama carb.

Take the carb with you to any small engine repair shop and they can supply a kit for approximately $10.

I have replaced the carb kit and experienced no change. It still will not run under load.. Just bogs down and dies. I am about ready to deep six it. Andy

Try opening the high adjuster 1/4 turn or so if it has one. Check the fuel line for cracks. Steve