Bobby Kirbos
Scrounger of Cellulose Based BTUs
I bought it like that from a member here who is often the target of ridicule. (and most likely deservedly so - think low hours Makita that looks like it went through hell)@Bobby Kirbos did you see a gain on the 490 when you pulled the base gasket? I was told the bump in compression may be cancelled out by the already low exhaust being brought down even more.
https://www.arboristsite.com/community/threads/sweet-makita-6421-hurry.313054/
My saw runs well, so I would say that in my case, it was as described.