Had a lot of customers come in over the years with no gas in the tank or bad gas.Some pulled the rope so much they broke it or the spring.Fixed the rope problem put in freash gas,presto saw ran.alot have come in saying the saw runs great but won't cut.Chain on backwards,showed them the problem reinstalled chain saw ok.One guy came told me the chain on his homelite was on properly when it was backwords wouldn't listen,I didn't have time right away to turn it for him.Told him to stop on his way home telling him mabe those homelites ran backwards to other saws.He excepted this,I turned the chain, about 2 hours later he picked up the saw I told him to try it before he left,he said that was the best sharpening job he ever had.I got credit for sharpening a brand new chain,told him I was flattered no charge.He was a repeat customer for years he still dosen't know that chain was on backwards.Sometimes people are really funny.