gy6 75cc spark plugs...
 

Ok so heres the thing.
First i had Denso spark plug in my scooter for about a year before it died. Than i bought NGK spark plug and it was working only for 2 months, than i bought another NGK spark plug and it was only working for 2 months again.

Every single spark plug was doing the same when it died: yesterday scooter started, today it wont, tommorow it will start again :S

And the problem is that spark is going from center lead to circle around it instead of going to upper lead.

Was i just unlucky and get old spark plugs at the shop or something or is my scooter wrecking the spark plugs?


Thanks!

Something tells me that you changed some other ignition component just before your Denso plug died. If not, then you need to. There is no way you could get 3 bad plugs in 6 months.

You didn't say what your plug looks like....can tell a lot about how well adjusted things are by looking at color and condition of plug.

Make sure gap is correct, and the ground strap from valve cover to frame is connected to good, clean, unpainted, point....but I still think something upstream of the plug is the cause of your problem.