Spark plugs fail

[herc_007]

Hi,

 

This summer i was riding my '01 shee With denso plugs and it did great, till one

day i thaught, i should replace my plugs because they were in there for a while. So i did i changed them with brand new NGK BR8ES, those did fine for 2 days, then they just died all of a sudden, i put back the old ones and they also died after a day. ( i know sometimes i dont let it warm up so good, buts it was more than 90 degrees outside) ::

 

my question is, what could have caused this to happen?

[fastbanshee8]

This would just be a guess, without seeing the plugs, but I would say that you are fouling them, because your jetting is too rich.

[jlsparky7]

This would just be a guess, without seeing the plugs, but I would say that you are fouling them, because your jetting is too rich.

Agreed.... What color are your plugs? Did you gap the new ones when u put them on?

[herc_007]

Agreed.... What color are your plugs? Did you gap the new ones when u put them on?

 

The right one is light brownish, and the left one is a little darker, but also when i took em out they seemed more wet than normal, so maybe youre right about my jetting,

And ho do you think i can solve this problem in the best way, if you can give detailed info plz.

[2003LimitedBanshee]

I think the key here was "90 degrees outside". Sounds like you have a jetting issue. Without changing your jetting, as the temperature increases, the air becomes less dense, less oxygen, and thus your air/fuel decreases. More parts fuel for every part air (technically fewer parts air for every part fuel). So what I am getting at is, as the temp increases your jetting will become richer with no other changes. I'd have to wonder how "light brownish" the one plug is, as one person's interpretation is different from another's. I would say you should be shooting for a light chocolate milk color. If you are finding the plugs wet after a failure (foul) then you need to decrease your jetting. You'll have to remove your filtration (in whatever form), remove the carbs, set them on the work bench and take the carb bowls off the bottom. You'll see a brass colored hexagon jet with a small hole and a number stamped in the "face" of it. From what it sounds like since you are rich you'll need to get a set of jets from someone (dealerships actually haven't been to bad on these prices from what I've found) probably one size smaller, but it could be two. After reassembling you'll need to warm up the bike, and do a Wide Open Throttle check. Run it through the gears and pin it in sixth, then while holding it wide open for about 6-10 seconds pull the clutch and immediately hit the kill switch, but don't let off the throttle until you've hit the kill switch. Then check the color of your plugs. Some guys say new, but as long as they aren't fouled you can do just as good on a slightly used set.