Little red Homies have a certain 'tip and slide' assembly technique you have to master. There is a small but important difference to each end of the throttle rod.
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One end has a more open 'U' and hooks to the trigger linkage. Tuck the spark plug wire where it needs to go also or it's left hanging out in the breeze.
I had lots of practice with my very first chainsaw, an XL-2 from a garage sale 20 years ago. I had that puppy sucking bar oil like a vacum cleaner.
One of mine is sucking bar oil.I replaced the pump diafram but its still doing it?