My 13hp yard machine by mtd not starting.I replace the coil after I had no spark,it only ran for about 20 minutes.Now it won't start and I have no spark.Iwonder if it is the coil again?

Hi, jolyluis!

I would like to give you an answer to your question. But, unfortunately, I can't. There may be someone on this site who can. But, we seem to get a lot of questions concerning lawn and garden equipment that go unanswered.

I care about your question being answered. So, I do know a site where topics about lawns, gardens and lawn maintenance machine issues are the specialty. You might like to give it a try. Here is the link.

Lawn & Garden Tractors Forum - GardenWeb (http://forums2.gardenweb.com/forums/tractor/)

The coil failing is rare, I would isolate it and test again. The black wire coming from under the flywheel is the ground wire make sure it is free and has nothing connected to it. This will help diagnose.. . I would look to a failing safety switch.

Don