Widened the exhaust port, modest muffler mod (3/8 straght out the front). Takes some tugs to start cold (5-6), just like my 4620. Runs well, will wait to cut until I get a 16" bar. I am runninfg 18" .325 on the 4620, may try 3/8 lopro on this. It was free:dunno:
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