I have a Honda HRX217 which is only 2 years old. It starts and runs only a few seconds and then dies. It does this repeatedly. So far I checked the following: 1) verified that there is plenty of fuel flow from tank to carb 2) removed carb and partially disassembled carb, cleaned carb in ultrasonic cleaner, reassembled and re-installed carb 3) sprayed the carb linkage with WD-40. After doing this, the IDENTICAL problem still occurs. It starts and runs a few seconds and then dies. Does anyone have any idea what's going on? Thank you