GerardTC Posted September 12, 2019 Share Posted September 12, 2019 (edited) Hi there, Need some help to adjust the carburetor of my Thor 200 engine (recently upgraded with the HF kit). After installing all the new parts (carb, air box, head, and fuel pump) the engine doesn't run very smooth. Here are the symptoms: - Rough idle. Jumps from 1500 to 2500 rpm (1800 is ideal). - Doesn't go higher than 7000 rpm. Should reach 7800-8000 rpm I tried to unscrew 1/4 turn the air screw and the rpm reaches 7200 but the color of the spark plug indicates a lean mixture. What would you recommend me to solve this issues? The actual carburetor settings are: Main jet: 142 Pilot jet: 45 Needle clip: middle Air screw: 1 turn out. Thanks in advance! Edited September 12, 2019 by GerardTC Quote Link to comment Share on other sites More sharing options...
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