Zener diode in lower ignition keeps blowing
 

i checked the spark plugs and they were old and dirty so i replaced them with the same brand and everything. Then i found this forum ordered 2 zener diodes first one lasted a month, hit a bump at about 25mph bike shut off. got it back to my house and replaced the diode again. this diode was good for about another month then died. Figured i should just buy a new lower ignition for 50 bucks to make sure the this aftermarket diode wasnt the problem. got the new lower ignition rode for about 30 mins last night then went to ride again this morning and got about a mile down the road hit another bump and lost spark again... any ideas? or did you guys have anything like this happend?

i had this problem had to solder diode in cheap ign i bought didnt come with one. it matters which voltage you buy you want 3.9 v to drop 12v to 9v. make sure diode is clear from metal mine was shorting out when hitting bumps. secured next one prob solved. hope this helps.