What kind of chainsaw?
Stihl. When I bought it about 6 years ago, the guy said to 'put the choke on, pull the cord three times, take the choke off and if it doesn't start on one of the next two pulls you did something wrong.'
It has not failed, even after sitting in the shed for three months without running.
So, when I wanted a pole pruner/trimer I got a Stihl.