Mower Cord Has No Tension?
Your recoil spring is broken. As these can be dangerous item to replace, I recomend that you have it serviced by a qualified mechanic.
Lawnmower Has No Spark at Plug?
Ive been a small engine tech for about 20 years. It sounds like you have a bad coil.
MTD Briggs and Stratton Engine Won't Start?
I recommend that you have the mower serviced by a qualified mech. It sounds like you have an electrical issue in the safety switches.
Lawn Mower Not Running Smoothly?
Could you post a pic of the lawn mower so I could have an idea of what model engine you have. There are a few different types of the 4.5 Briggs
Why Does the Pull Cord on My Gas Mower Slip?
Hi, Ive been a small engine tech for about 20 years. Just a couple of questions that may help me help you. 1. Is this a Briggs and stratton Engine? 2. Did you rewind the recoil spring before installing the rope?