What causes oil fouled plugs?

[Tim573]

I rebuilt my 2000 banshee and it ran fine for about 3 weeks and one day i was riding it and it started backfiring and sputtering and would only go about 5 mph. I had a air leak in one of my boots so i replaced them and it still does it. Both plugs were oil fouled so i replaced them and the new ones even had oil on them. I was running 20:1 the whole time. Does anyone have any advice? Should i run a different gas mixture? I have t5's, vforce reeds, ported cylinders, dyna ignition, aftermarket carbs. I am running 93 octane. NEED HELP

[1.6i]

have you checked your compression?

 

why 20:1?

 

i run 32:1 never had a problem with a fouled plug..

Edited August 2, 2006 by 1.6i

[Bansh-eman]

yea 20:1 is really rich in oil you should be at 28:1 - 32:1

[Samdogmx]

yeah I'd try running 32.1 & get some new plugs

[TeamBigginRacing]

32:1..^^^^^^what kind of oil mix r u running?

[csrmel]

nothing wrong with 20:1 if youre jetted properly. 20:1 and 25:1 is the factory spec, afterall guys.

[dajogejr]

I agree...too much oil. I think the manufacturer keeps it rich to be safe. Too rich for my taste...

 

What is your jetting currently at with your mods, and what kind/size/type of carbs?

[MYquadsFaster]

i run about 40.1 yamalube in my banshee and my plugs still look oily........02.

[duneloon]

You may want to look at your harnes. make shure it hasn't been burnt throgh to wire.

 

Did you mod. it while it was apart