1989 X2 with 28mm carb. Poor idle problems and bogs above throttle. I know my low speed air screw is damaged but trying to compensate with different adj. the choke plate has been removed and all FA screens missing. I can get it to idle good and run crisp on trailer if I put restriction (sponge) to take the place of FA screens. Fuel pump is working. I know I should scrap this 28mm and go larger but doing small steps. Under load in water it idles but doesn't develop any power with (sponge) restriction. Won't idle or Rev at all without restriction. Acts like its starved for fuel. Good spark both cylinders , haven't checked compression yet. How critical are these 28mm for having choke plate and FA screens removed. Acts like it needs better carb signal. If anyone has a good working 28mm carb and FA willing to sell I might be interested.