Is calibrating the ignition timing on my mariner 125 hp complicated or is it something i can do on my own?

Question

if you think i should pay for it, about how much would it cost?????

Answer 1

If you are planning to keep this engine for awhile, invest in a tuneup and repair manual.  It will pay for itself many times over the life of the engine.  Here is a site that sells them:

http://www.marineengine.com/manuals/selo...

Answer 2

it should self adjust