If there's any doubt about it get a new saw you can trust and then you have the choice to either repair the old saw and keep it as a backup, repair and sell at best (might not be viable economically) or selling it for someone else to repair and recover the $$$ that you can out of it... That sounds a bit defeatist in the world of fixing saws being manly etc etc but if it isn't your core business or a hobby thing you do for fun it's probably not worth getting the kit you need to do it.
On a side note, I just got given a lightly used Homelite 46cc saw which is to be used as a donated asset for a volunteer unit - interesting thing as far as chainsaws go. It's no Stihl or Husqy pro saw and arguably not as robust as something like a 236 or MS180 but once I sharpened the chain properly so it actually cut it operates fine. Dare I say it, it's easier to start than the Husqy and Stihl's I've had too. Lighter and the vibration system seems to work rather well. That kinda pisses me off for some reason haha... Only thing I need to look into on it is that it appears to have an oil leak from underneath - probably a leak from the oil pump gasket or oil tank vent or somesuch. A job for tomorrow. Also need to work out the chainsaw quals angle on it modern arse covering.
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