Hey there. I have a Flying Horse (Huashengtaishan) engine kit that I built onto a Scott about 2 years ago. Outside of the, "it's my first time build issues" things have been going well. At the end of last fall the engine went wonky. It revved really high and then would just die. It will idle for a bit if I have it choked, but as soon as i open the choke it revs to full RPMs and dies. I have about 250 miles on the engine with no prior issues. I changed out the stock muffler/catalytic converter about 3 week before it started acting up. I pulled it out to day and have been tinkering around, but I don't really know where to start. Any ideas would be really helpful.
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