Small Engines (Lawn Mowers, etc.): no spark, wire casing, briggs stratton

Question
lawn mower sat all winter went to start it wont start no spark it is a briggs&stratton 6hp 4stroke rotary engine i replaced coil still no spark there was rust on the flu wheel so i sandes it with wd 40 with 1000 grit paper to get the rust of ther are 2 main sets of magnets one side of fly wheel has long magnet sections these are magnetized the other side of fly wheel has a series of chorter magnets these dont have any magnetism do i need a new flywheel and how did tey become un magnetized there are no points just the coil and the fly wheel the lawnmower is 2 years old and is a craftsman 22 side discharge  

Answer
No you dont need a new flywheel. The magnets you are refering to are really just counterweights to keep the flywheel balanced while its running. Only one set will have magnetism. the gap between the coil/magneto and the flywheel is (.010).  You can use a business card to set the gap. turn the flywheel till the magnets are in front of the magneto and slip a business card or something of similar size bewtween the magneto and the magnets. Loosen the mag till the flywheel magnets draw the magneto over and sandwich the card. Tighten the mag back down and remove the card by turning the flywheel. Be careful not to pinch a finger. Ive done that a few times and it really hurts.   check the kill wire that runs from the underside of the mag to the flywheel brake and switch. Make sure the wire casing hasnt been rubbed off against the engine block therefore grounding out the magneto. make sure you are grounding the plug when checking for spark. the muffler is a good place to do this while someone pulls the rope for you. you can hold the plug boot while doing this and you should be ok. but if your afraid of getting zapped use a glove or pair of pliers to hold the boot with when someone pulls on the rope.