fouled 2 plugs today...

[ROACHIE]

as some of you may know i just got a 2000 kx250 yesterday and today i went to go for a rip...i was rippin' thru the trails behind my house but noticed it wasnt running right...so i gunned it thinking the plug was fouling which it was...and it ran fine for a couple minutes and then started bogging again...only this time it shut off soo i sat there and kicked it like 20 times till it finally started back up and tried revving it but it shut off again...soo i push it for about an hour thru the trails to the road and back to my house...i get back and put another sparkplug in it and i rip it around my yard and it was running fine...shut it off then went to ride again about 2 hours later and when i was warming the bike up it died again...it has a pro circuit pipe and silencer,v-force 3 reeds, head shaved .20 over and its jetted just a hair rich but jetting is perfect where its at...no dead spots...soo my question is last night i put in some 87 octane gas mixed with pennzoil in my tank that he was running benol in...but it wasnt even a quarter of a gallon of my gas i put in...could this be why its fouling or what should i look for?

[awames76]

what ratio is the oil at, did u check jetting after u changed oil. clean carb and check jetting sounds like its rich on oil

[ROACHIE]

thats what im thinking too...the plugs came out black as night and soaking wet...i think he was running 40:1 with benol and im running the rest of my 40:1 pennzoil...all i have to say is benol is some weird shit

[awames76]

drop a jet and recheck jetting, buy a case of plugs lol good luck

[ROACHIE]

found out my problem...it was running on race fuel and benol is a castor oil and when i put in the 87 octane gas with the wc-3 oil it messed it up...soo now im gonna drain my gas and rejet for premium and klotz r-50 and motul

[xxxbansheexxx]

wouldnt a shaved head add compression so i would say if they were still bogging after the rejeting i would put some 93 octain in your tank

[MX86]

if the head is shaved .20 i WOULD NOT run anything less then 110 octane. in stock form they recomend 93 octane +

[socket17]

ehh 20 off the head you can still run 93.. i dont have a issuse and i run 32-1 benoil.

[MX86]

.20 off on a banshee you can, but what does that put you at like 150 psi?

a RACE bike is 215-250 psi from the factory. they will ping on premium gas unless you run it rich.

20 off on these bikes you NEED race fuel. not to mention the bike be way happier lol

[ROACHIE]

soo mx86 would it be safe to stick with the benol at 110 racing fuel or higher...or can i switch to synthetic r-50 or motul?
i know those castor oils are weird if you dont run them with like meth or extremely high octane