Ok, on this topic opinions are like bumholes - everyone has one and most people think their's works the best...
What I do as I have 'my' saws but end up getting fixer uppers or ones that other people want to fix and most of the time I'm using them and not 'my' ones... So basically after I use them I tip the fuel out of the tank and chuck it back into a fuel can (check to make sure it's not completely fuel of wood pulp and crap first) and then make sure I fill it up every 3 months or so and start them up to keep everything working. Most of the time carby bits and seals go bad if they are stored for long periods of time, so far of about 10 odd years or so after doing this I haven't had a problem. Had to rekit a couple of things prior to that due to old fuel and perished stuff, so went to the dump the tank and it seems to work. I don't run the carby's dry, as for a short time you are turning the engine over without fuel mix going in - ok if you run it out of fuel using it every now and then but as an intentional practice I'm not a fan...
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