83 250r keeps fouling plugs?

[83atc250r]

so heres the deal picked up an 83 250r couple weeks ago the guy i bought it from gave me a 5 gallon container of mixed gas he said he mixed it 20:1 ran through all 5 gallons without any problems started first kick everytime.so ran out wanted to ride real bad over memorial day weekend but evevrything was closed so bought some oil from autozone said it was for dirtbikes n such ran 2/3 of a tank n it fouled a plug put a new 1 in fouled that.So i drained the gas and ran hp synthetic 32:1 with a new plug, power band lasted 5 seconds than rans worse and worse until it died out .cleaned plug and tryed it about 20 more times got it to run right for about 5 mins then it started putting again?plug is soaked every time i pull it out.Seems like when i shift before it starts studdering it clears itself out a lil but will not stay consistant.My foot is killing me from kicking this thing please help thanks

[fabiodriven]

Do us all a favor and work on the grammar please.

Sounds like you may have a jetting issue or a clogged air filter, stuck choke, or something like that.

[Thorpe]

Dont clean plugs. Replace them. Buy good plugs, not champion crap. Get a few decent NGKs....

[harryredtrike]

get a new plug,and new gas.mix the new stuff at 20-1 and try that.changing the mix also requires small adjustments on the carb.

[Brianw]

check your tank for debris, i had a running rich problem and my floats were stuck from some sand granuals (not alot but any isnt good for a motor) easy fix.