plugs stop working after 2 weeks new plug in bike starts

[raustin584]

replaced plugs two weeks ago everything was fine then three days ago bike won't start. plugs looked good but didn't have a spark. a little black but nothing bad. Sprayed one plug with starting fluid to clean still no spark. Installed new plug now has spark. desided to replace all plugs and bike now has spark and runs again. new plugs are ngk old (which I mean two weeks old) were champions. The bike is a 81 gs550L. any idea why this is happening? Are the packs weaks? bad plugs? looking for any and all ideas.

[dietcokeking]

replaced plugs two weeks ago everything was fine then three days ago bike won't start. plugs looked good but didn't have a spark. a little black but nothing bad. Sprayed one plug with starting fluid to clean still no spark. Installed new plug now has spark. desided to replace all plugs and bike now has spark and runs again. new plugs are ngk old (which I mean two weeks old) were champions. The bike is a 81 gs550L. any idea why this is happening? Are the packs weaks? bad plugs? looking for any and all ideas.

Taking for granted that your plug no. and gap is correct, something else must be wrong if the extra resistance of 2 weeks running won't let through a spark. Wires or coils weak?

[SqDancerLynn1]

DON"T use anything except the proper NGK plugs

[lord1234]

all the experience I had with Champion plugs says that they are GARBAGE. Use the NGK plugs as suggested by the above poster.

[Guest]

Champion

I had a similar problem in a old Yamaha XS650. I just figured that Champion Spark plugs are junk because I didn't have a problem with the NGKs.

[GS750]

Ive used champion's before in my bike and had heaps of problems, went to NGK and had no problems since.

I now use the iridium plugs, much better