My HR214 very slowly fired up for a few strokes then died. It did this several times with the lever in the choke position. After pulling out the spark plug and adding a thimble full of gasoline it fired up and ran fine for 30 seconds and then died and couldn't be restarted. The next day it did the same thing. I changed and gapped the spark plug. Drained the gas tank and inspected the gas filter in the gas line at the outlet of the gas tank. Replaced the carburetor. Checked and reset the valve clearance (.004" intake and .006" exh.). The oil looked great so I didn't touch it. After doing all the above the mower still acts the same. Actually, last week (before the above) I was cutting the grass and the mower ran fine for approx. 5 minutes then died, and I finished the job with my backup mower. Any suggestions?
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