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Hi all.  Hoping for some help.  I have a compagno 50i and it went a little while without use.  It started to studder at full throttle but is good up to about 3/4 throttle. I drained the fuel by running the pump, just took out and cleaned the fuel injector with brake cleaner and compressed air (while opening the injector with a power supply).  Started right back up with the same condition.  Any suggestions?  I didn't see a fuel filter but didn't dig.  Air filter is clean.  Scratching my head in this one...