Leaf blower

Hi, I have a Craftsman leaf blower to repair for a friend ... the engine is a 25.c.c unit, 250mph blower. I am not getting a spark at the plug ...I tried another plug...still no spark. Does anyone have any idea where I might begin looking.I do not have a repair manual for the machine, don't know exactly how old it is either .... 4/5 years perhaps.

Thank you.

Post model number.

First I would double check that there isn't spark with an inline spark tester and also by removing the plug And placing it against the engine block.
If there is no spark I would check the kill switch then the coil ground. If that's good the coil is probably bad.