i picked up a near 100% bone stock 250x in almost mint shape inside and out. i found that someone had swaped in a kehin 38mm pe carb. side # dg8bbmi on the side of the bowl lip. it currently has a ajm top groove neddle / o4f 3.5 slide / 160 main / 50 slow jet / air screw from bottomed out back 3.25-3.50 turns. stock exaust is still on the quad. i plan to ride trails here in ny/pa area and possible run a bit in the winter time . we are around 1800-2000 ft above sea level in my area. i would like to run prem 91/93 pump gas to keep it good and clean unless you have any other fuels that are good and dont cost 9.50 gal like i feed my quadzilla. any help to make sure this is set up correctly would be great as its a ? ? ? bike as to history on my end. all i know is what i have found out. thanks and have a good day.