I have a shindaiwa hedge trimmer dh230, srats , idles fine, when reaching almost full throttle it cuts out / almost stalls. Taking the air cleaner off seems almost at full throttle too much fuel rushes in. I fitted new carby gasket kit has improved it alot but still cant get it to rev at its highest without it drowning. The carby itself doesnt have any visible signs of air / fuel mixture control. Removing the muffler just in case or blockage still does the same thing. I have cleaned the fuel filter, all hoses are clear, fuel is new, air filter is new and clear. Carried out carby clean, still the same.. anyone have any ideas, experience and or manuals on this hedge trimmer or carby technology.