Brand new Coleman ct200u-ex doesnt always start and turns off. Help!

ango

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Dec 13, 2021
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5
I just purchased a brand new assembled Coleman CT200U-EX mini bike. I have been wanting one for years. Anyways after about 3 hours or so of riding since my purchase, the bike is idling rough and doesnt want to start at times. I can start it with the choke then lay off the choke, which then sounds smooth but then it dies after about 1 minute or so. Its putting out some black smoke. I can see on the valve cover its a bit discolored now. I don't know if its getting hot. I tested the spark plug (it has spark) and then changed out the fuel and oil. same thing. I took off the round ball (gold in color to check it) but its clean. I don't know what is happening. I am attaching a photo. Any help would be appreciated. Im about to return it to the store. Im new to this.

It takes a NGK CHDY F7TC spark plug. But I cant find it at my local auto parts store.
 

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DAMIEN1307

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It takes a NGK CHDY F7TC spark plug. But I cant find it at my local auto parts store.

NGK BP7ES, or if it needs a colder plug, NGK-BP5ES, are the actual NGK numbers that replace the Chinese F7TC plug​


I would go with the colder plug on that one...Be sure to gap it at .025 thousandths.
 

Wrench

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Nov 14, 2018
Messages
5,010
Bump up the idle. If your carb isn't adjustable thanks to the EPA adjust the Idle at the throttle adjustment barrel
 

Wrench

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Nov 14, 2018
Messages
5,010
I just purchased a brand new assembled Coleman CT200U-EX mini bike. I have been wanting one for years. Anyways after about 3 hours or so of riding since my purchase, the bike is idling rough and doesnt want to start at times. I can start it with the choke then lay off the choke, which then sounds smooth but then it dies after about 1 minute or so. Its putting out some black smoke. I can see on the valve cover its a bit discolored now. I don't know if its getting hot. I tested the spark plug (it has spark) and then changed out the fuel and oil. same thing. I took off the round ball (gold in color to check it) but its clean. I don't know what is happening. I am attaching a photo. Any help would be appreciated. Im about to return it to the store. Im new to this.

It takes a NGK CHDY F7TC spark plug. But I cant find it at my local auto parts store.
Brand New - It's under warranty, take it back and have it fixed. Ask them what's wrong
 

Chainlube

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Joined
Jan 5, 2020
Messages
5,877
Check the nuts holding the carb on, one or both may have come loose causing an air leak.
 
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