Hi, New to this forum. I purchased a 1987 xl250r a year and a half ago and here and there i do a bit of work to it. Yesterday while washing it i noticed that the throttle link going to my second carb was not connected to the second carb so anyhow i connected it temporarily and then i noticed that this bike has more potential than i thought (the carb was disconnected from the day i bought it) having a parts bike i decided to change the linkage and took the time to clean the carbs. so now that you know my story here's my questions. 1 - the primary carb has a 105 pilot jet and the second carb has a 108 pilot jet. Are those jet sizes original size? 2 - the bike has a cobra exhaust should i use the jets mentioned in my first question? 3 - now from the very little info i found on the net i seen that the second carb opens after the primary carb. is there a precise way to adjust that? (i saw on a xr forum that the second carb should open as late as possible and still reach the fully open position at WOT...does that apply to my xl?) 4 - what would the symptoms be if the second carb does not open at the right time? before i noticed that the 2nd carb was not working the bike would bog at WOT and max speed was about 105km/h. Thanks and great forum by the way i have used it alot in the past (as a guest) and it helped me alot.