i have an ht 80cc 2 stroke, first let me start off with my first problem, i was riding home from work and the front mount bolts snapped, wich broke the chain and front sprocket cover, so i ordered a new chain, fuel tank (wanted a bigger one), sprocket cover, cdi, and carb.repaired a week ago. i noticed my back tire needed to be replaced, so i rode up to the local bike store and bought a new tire, on my way home, im riding like usual, and about 1 block away the motor dies, discovered it has no spark(tachometer wasnt reading anything), so i put on the spare cdi i purchased, wired it up, and still no spark, so i assume its the magneto and purchased 2 from boygofast via ebay, and a magnet. my question is what would make the magneto fail after 500 miles, and earlier in the day i pulled the plug wire to kill the engine, could that cause magneto failure?