Early model 034 has been fantastic saw for over 30 years. About 3 years ago the carb fuel inlet screen would plug up with I guess saw dust. I would run it for a few hours and then clean it out and go again. Then it got to the point I had to buy a new carb, fuel hose, fuel filter, air filter. Thinking I had it fixed ran it for 30 minutes and it quit running. Inlet screen plugged again. The impulse hose looks ok. The gas tank is clean and the fuel I use is clean. The saw is original except for carb and air filter. I can usually fix anything but this has me baffled. I even thought about taking it somewhere to be fixed but they aren't going to run it for a half hour to see it plug up. Thanks for any help.