Great looking site-newby here. Here's my problem: I have an Echo HC-151 hedge clipper and I broke the return spring on the carb. rotor assembly(I'd call it the butterfly valve). Took it to the dealer and couldn't just buy the spring but had to buy the whole cover assembly rotor(#P005001320). After installing the new rotor ass'y I could only start the clippers with full throttle and then it would die if I dropped it below half throttle. It will not idle, only will run in wide open down to about half. Idle adjustment screw is turned all the way in but no help. BTW clippers ran fine before I changed the rotor I just had to turn the rotor by finger to drop it to idle speed. There are no adjustments like H/L only idle speed. Obviously I did something wrong but can't figure it out. I've taken it off and on several times looking for the obvious but nothing clicks. The new part and the old one are identical. Does anyone have any suggestions or ideas?? Thanks in advance for help!!