I purchased an 84 FJ45 tray back six months ago, a bit of an impulse buy but have had an interesting time slowly ironing out a long list of faults and it now drives quite nicely and noisily. The carby has developed a high pitched whistle that starts about 30 seconds after starting all but stops when the second barrel is open and very noisy at idle and when decelerating, I stripped it down and rebuilt it with new gaskets etc and eventually got it running again after a bit of back tracking and now runs perfectly but the whistle is louder than ever. Any ideas? This is driving me nuts.