I’ve had a broken ring on my old K&B40(model 4011 / produced until about 10 years ago). I’ve sent it out for replacement and cleaning and now when I started to run it won’t work at all as I was expecting. It won’t idle at low speed and it seems that it reaches full rpm at half throttle. If I open the carb fully it slows down and eventually dies. I’ve tried setting the needle valve differently but I get the same result.
What am I doing wrong(I even took the entire carb assembly out - thinking that it leaks air somewhere – and tighten it back in)? Should I replace the O rings on the carb and where can I get them from? (see my old post HELP ! Old K&B .40 on 1/4/2004)