Hi all, This is my first post here, but I have been using the site for a while now and would just like to say to you all what a great site you guys have here. Ok so on to the topic of my post.... I have recently purchased a 1989 yz250wr for £400, things that are not stock are pro circuit pipe prox conrod kit 1mm oversize piston twin air filter I have a running issue with this bike and that is when you get it started up and turn the throttle 1/2 open or more the engine begins to bog down, drop below 1/2 and it runs ok but doesnt want to idle and exhaust fumes smell quite heavily of unburnt fuel. My research would suggest jets are too large and I have been having trouble tracking down what size the stock jets should be (riding in uk , not much above sea level and mostly trail riding). The compression seems good and silencer has new packing fitted, running 32:1 premix, air screw is set at 2.5 turns out from seated which again suggests needing a smaller pilot jet. Carb is thoroughly clean along with the tank, fuel tap and filters, needles etc look to be in good condition. Any help or tips you guys can send my way would be great (or anything I am doing wrong please correct me lol). I have attached a pic of her, she needs tidying up, dodgy paint job has to go and not keen on the graphics - but nice project for this winter thanks again guys and keep up the good work here.