I recently acquired a 1958 Excello 700, self propelled rotary mower. It has a briggs model 8b-h that we cannot figure out what is wrong with. Does anybody have any information about Excello mowers. There is no info about them on the internet. The motor is producing spark, has compression and carbonation, and is getting fuel, but will not fire. Think it is the coil/magneto, because it isn't sparking the plug. Either that or it is out of time. If anybody has any parts for these motors, please reply. I can trade for lawn boy parts. Thank you!!!