PDA

View Full Version : 300cc running rich

Johio
09-23-2020, 03:19 PM
Started working on my 2007 Zhejiang Xinyang utv. It was running rough,but running! Now,after some maintenance it is loading up. It starts. It will idle for a short while, then die. Changed oil, plug, fuel filter and lines, fresh 93 octane gas. It is a 300cc carbureted single cylinder. Thanks
Johio
09-25-2020, 08:27 AM
Going to try and clean the carb. It has an electric choke. Any thoughts?
cheesy
09-25-2020, 08:46 AM
Unless modded, these things usually run lean from the factory to pass US emissions, so I would pay particular attention to the choke. If it isn’t opening fully, you are going to get the symptoms you describe.

Myself, I have never trusted a choke that wasn’t manual.
Johio
09-26-2020, 06:22 AM
Not sure how the choke works? I will check it out today. If I replace the carb I would like to go with a manual. Thanks for the input.
cheesy
09-26-2020, 08:18 AM
Not sure how the choke works? I will check it out today. If I replace the carb I would like to go with a manual. Thanks for the input.

Without seeing it, I can only guess. But most likely uses an electrified coil to close the choke.
Johio
11-01-2020, 10:36 AM
Replaced carb seems better. It has an electric choke, it works with a needle valve. Not sure how it is controlled.