I installed this in my 2017 Coolster 3125CX-3. I had problems with idle fluctuations and after installing this carburetor it worked perfectly. I still get a bog when cranking the throttle wide from idle, but I haven't installed a new main jet. If I push the needle clamp all the way down it stops, but then I twitch in the 1/4 - 1/2 throttle range from full to rich. The carburettor works great and it was 100% bolted and I was able to reuse the original throttle cable. I had to fully adjust the throttle cable to leave more wire end on the carb side.
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