New to ME Coleman CT200U-EX Won't Run Without Choke

[Shortiecar]

Just got given a Coleman CT200U-EX my Godfather has had for a few years. He never rode it, tank empty and stored in a decently nice garage. Previous owner bought it new from Tractor Supply and also really never used it. Now its in my hands. All original, fully documented. Carb was clean but in my best interest I took the carb apart and fully cleaned it out because it won't run without the choke all the way on. Runs super smooth and everything choke on but dies without. Air Mix screw wont do anything. If you run it wide open and flip the choke off at any engine temp it gets noticeably louder and honestly barely runs. Nothing is clogged, no jets or orifices have anything in them. Only fresh gas. What causes something like this?

 

[pknopp]

My limited experience thought would be Chinese crap. I know people have them work but my experience with Chinese carbs is they are crap.

I posted a mini here and bought a cheap Chinese carb. I could not get it to run off choke. Even then it ran poorly.

Solution? Hopefully someone with more experience can help.

 

[Shortiecar]

My limited experience thought would be Chinese crap. I know people have them work but my experience with Chinese carbs is they are crap.

I posted a mini here and bought a cheap Chinese carb. I could not get it to run off choke. Even then it ran poorly.

Solution? Hopefully someone with more experience can help.

I call Chinesium. You’re probably right

 

[Triley41395]

Sounds like it might be a bad gasket, sucking air at the base of the carb.
Buy a new Chinese carb and new gasket.
Make sure everything is clean and flat before you install the new carb

 

[Shortiecar]

Sounds like it might be a bad gasket, sucking air at the base of the carb.
Buy a new Chinese carb and new gasket.
Make sure everything is clean and flat before you install the new carb

When I took the carb off yesterday the gaskets were pristine. Though I did notice they were definitely hard for being little engine gaskets. Honestly good observation, i’ll check it soon and report back (my method is carb clean around the carb to see if it bogs or revs up) and if thats the case considering its not hard to do when the time comes I’ll just go straight to an aftermarket carb with a decent throttle

 

[Mark Brooks]

Yup Yup Yepper you're on the right track there Shortiecar, I say this cuz I've had that same thing happen.

Gave grandson same bike, same thing would not run after hours of working thru the Carburetors. Finally bit the bullet and swapped carbs out.

Pro'lum solved!

Hence it's a roll of the dice with the Chinesium carbs.

Keep us in the know, inquisitive minds wanna know...

 

[Lizardking]

When I took the carb off yesterday the gaskets were pristine. Though I did notice they were definitely hard for being little engine gaskets. Honestly good observation, i’ll check it soon and report back (my method is carb clean around the carb to see if it bogs or revs up) and if thats the case considering its not hard to do when the time comes I’ll just go straight to an aftermarket carb with a decent throttle

An air leak will cause the problem described and doesn't have to be from the carburetor itself. Check the intake manifold for a flat mating surface and good gaskets.

Too much air or not enough fuel is usually the problem followed by "not worth the effort" Chinese carb.

 

[sparkwizard]

Did you check the little sediment bowl under the fuel cut-off? Do you have good fuel flow when that bowl is removed?

 

[DaddyJohn]

If you search “GX200 carb” on Amazon, you’ll see a wide variety of suitable carbs for $15 or less. A new carb often fixes the problem (if cleaning the original didn’t take), and if it doesn’t, it’s still worth it to have a spare. They usually come with gaskets, and I like to buy ones that come with the plastic insulator. I’ve had those be cracked and cause a giant air leak. Usually from over tightening the carb screws.

 

[Shortiecar]

Yup Yup Yepper you're on the right track there Shortiecar, I say this cuz I've had that same thing happen.

Gave grandson same bike, same thing would not run after hours of working thru the Carburetors. Finally bit the bullet and swapped carbs out.

Pro'lum solved!

Hence it's a roll of the dice with the Chinesium carbs.

Keep us in the know, inquisitive minds wanna know...

60% of the time, a Chinesium Carb works every time. -Sun Tzu or something, idk

 

[Shortiecar]

An air leak will cause the problem described and doesn't have to be from the carburetor itself. Check the intake manifold for a flat mating surface and good gaskets.

Too much air or not enough fuel is usually the problem followed by "not worth the effort" Chinese carb.

I had an idea. I wonder if putting petroleum jelly on the stock gaskets would help detect a leak or help them seal... that would determine if the mating surface is flat on the head or carb or box or not. Mind you, these little powersports and utility engines dont have a metal flange intake like mopeds, dirtbikes and such do.

 

[Shortiecar]

Did you check the little sediment bowl under the fuel cut-off? Do you have good fuel flow when that bowl is removed?

Completely and totally.

 

[Shortiecar]

If you search “GX200 carb” on Amazon, you’ll see a wide variety of suitable carbs for $15 or less. A new carb often fixes the problem (if cleaning the original didn’t take), and if it doesn’t, it’s still worth it to have a spare. They usually come with gaskets, and I like to buy ones that come with the plastic insulator. I’ve had those be cracked and cause a giant air leak. Usually from over tightening the carb screws.

That's smart. I'll note the insulator thing for future projects