Re: 1989 wr250 manual
PCK UP A TWO stoke crankase oil, make sure it is for 2 strokes, i use silkolene medium weight. you can go with honda or any name brand oil desesigned for 2 stroke dirt bikes. you need to premix your gas at 32:1 . which means four ounces good 2 stroke oil(like silkolene comp 2, or honda hp2) to 1 gallon 92 or 93 octane gas. i use silkolene pro 2 full synth at 40:1 with 108 leaded fuel.that bike is very similar to a yz250 of that year except it has a spark arrester, lights, wide ratio trans and probally a flywheel weight. i still have my manuaul for my old 91 yz250, i think it covers the wr and yz from 88-92. if you want it i will sell it to you for 10$ plus ship. i am in pa. there like 40$ from the dealer plus tax, no torn pages.
i would change all the fluids and put fresh gas in it, do a compression check, clean the air filter and get a new spark plug. repack the muffler if you can. the plug should be a b8eg if i remem correctly. use motorcycle radiator fluid also. car stuff has aluminum sulfides in it that are mildly abrasive to clean the system and will damage the water pump seal on a bike. it happened twice on my old bike until i found out about that.