I have a trail boss 250 older model with a model number of W888127. It ran strong for quite awhile then suddenly we don"t have any spark. Does anybody out there have any tips on how to check the mag, with a volt\ ohmn meter?. Thanks Tom!!

 

Check the stator wires leading to the cdi. Black/Red to Brown/White 120 ohms,coil primary tab to ground 0.3 ohms, coil secondary(coil tab to plug wire,cap removed) 6.3k ohms,plug cap range 3700-6300 ohms. Readings are + or - 20%.

 

Thanks very much for that advice for that magneto. Tom B.: