Chinese carb

[atc350xer]

Hey guys... I have a 110cc machine that ran great, then a week later it would only run on choke and won't idle. I removed the carb assuming something had gotten in there, squirted carb cleaner all over and through it, and gently used air to clear it. I am afraid to take it too far apart or change anything drastically, cause if I do this, it will never work again, ever! Any suggestions?:confused:

[rickybudz]

Sounds like your going to have to face your fears. I had the same problem, didn't want to take it apart completly. But untill I did, and cleaned everything in parts cleaner, very thourhly, then blasted all the holes/ports with air. My carb just would not act right. It isn't that bad. Just pay close attention to the pilot adjustment. Actually if it's messed up like that, go back to all factory setting to start with. If your not comfortable at any time, these people on this site are pretty good about helping you get through it!

[atc350xer]

Thanks, that's what I'm hoping for... but with it being Chinese, I don't even know what the factory setting should be, you know?

So I should use parts cleaner, not carb cleaner?

[rickybudz]

Thanks, that's what I'm hoping for... but with it being Chinese, I don't even know what the factory setting should be, you know?

So I should use parts cleaner, not carb cleaner?

I just used parts cleaner, cuz it's all I had at the time. I don't really see much of a difference. As for factory setting, What kind of carb is it, besides just China made. Post it, and the factory setting reply's will probly come soon after!

[200XMichigan]

Cleaning a carb without taking it apart is like showering with your clothes on. It just doesn't work out right.

I have never seen a carb were you could even mix up the jets, they usually all have different treads. The two screws on the side, one control mixture, the other is a throttle stop (if its like my Trail 90 carb), just turn them in until they stop gently. Counting how many turns, and set them to what they were before you took it apart. A general rule for air mixture is 1 1/2 turns out.

[rickybudz]

Cleaning a carb without taking it apart is like showering with your clothes on. It just doesn't work out right.

I have never seen a carb were you could even mix up the jets, they usually all have different treads. The two screws on the side, one control mixture, the other is a throttle stop (if its like my Trail 90 carb), just turn them in until they stop gently. Counting how many turns, and set them to what they were before you took it apart. A general rule for air mixture is 1 1/2 turns out.

I figured 1 1/2 to 2 1/2. I just don't know about those piticular carbs.

[JoeyStacks]

Cleaned mine the other day for the first time. watch a youtube video on taking it apart and cleaning it. It will help you face your fears. Not as scary as you may think. Only I got screwed because when I was ajusting the Idle from it shutting off I shattered the pull start spring into 3 pieces... But that has nothing to do with the carb so you will be fine

[oldskool83]

take it appart and clean it, 1 single carb is not a big deal...try doing motorcycle carbs, i rebuilt a friends sportbike carbs this weekend, now thats somthing to be scared about 4 of them attached and then sync them together haha!

total time on that took me 6 hours...a single carb shouldnt take more then an hour make to clean up good or rebuild. normaly the jets get clogged up so carb clearer spray or a gallon of it and let it sock a few hours but take all seal out if you go that route. then use an air compressor and blow out all the passageways.

[atc350xer]

Ok... I took it apart, squirted carb cleaner in every orifice, put it all back together... I could see dayllight thru the holes. I re-set the screw to where it was before I took it apart (3 1/4 turns). It will run without the choke now, but I have to keep the throttle on to keep it running. If I adjust the idle any higher, the centrifugal clutch will engage. Not sure what to do at this point, other than tear it down again and let it soak. Thanks for the help, I appreciate it!

[200XMichigan]

Sounds like you should play with the adjustments. Are there two screws on the side or just 1? If the idle mixture screw is out 3 1/4 turns that is a lot. Try turning it in some, then it should be able to idle at a lower RPM.

"try doing motorcycle carbs, i rebuilt a friends sportbike carbs this weekend, now thats somthing to be scared about 4 of them attached and then sync them together haha!"

Someday I'll get my hands on a CBX and I'll get six carbs to play with all on one machine.

[mopar_man]

I'm betting your tank is rusty and the filter screen has picked up some rust. They're not all that difficult to rebuild. Pick up a manual or download one: http://www.3wheelerworld.com/showthread.php?56218-Get-your-trike-service-manuals-here%21-Updated-9-13-07

Kits are $20 on eBay. Chinese carbs are $40, and from what I've read here, very hit and miss for reliability.

[atc350xer]

I'm betting your tank is rusty and the filter screen has picked up some rust. They're not all that difficult to rebuild. Pick up a manual or download one: http://www.3wheelerworld.com/showthread.php?56218-Get-your-trike-service-manuals-here%21-Updated-9-13-07

Kits are $20 on eBay. Chinese carbs are $40, and from what I've read here, very hit and miss for reliability.

Nah, plastic tank, I doubt there's a manual for this POS... and if there is, it's in Chinese :(

[mopar_man]

Is this on an off-brand Chinese four-wheeler or something?

[atc350xer]

Is this on an off-brand Chinese four-wheeler or something?

yes... "Loncin" motor

[mopar_man]

I could be wrong but if it's based off the Honda motor, a manual from a 90/110 should do you just fine.

[3wheelmecca]

try looking at the main slide. I had to machine a little bit out for more airflow and the 1969 Trail 90 ran great, still does today. Only a last resort though. does it have an actual choke or an electric actuator? One Chinese bike I worked on had a choke acutator that made it run similar to yours.
best of luck

[atc350xer]

Ok, got back into it today... played with the 2 screws a bit. It runs perfectly with the choke all the way on. I have tried every imaginable combination, and no matter where I have the screws if I take the choke off it dies. I am close to using a sledge hammer to fix it... will it hurt it if I run it with the choke on?

[Dirtcrasher]

No, the sledge hammer will hurt with the choke on or off :D

IF it needs the choke, then it is LEAN, Why is it lean?? is the jet dirty? too small? is enough fuel getting to the carb? cleran and flush that tank if it's metal and then run an inline clear plastic filter.

Don't get frustrated, then nothing goes right. I do not like those 65$ EBAY carbs, I have not had any good luck with them and they have odd jets.....

Get back to basics, I had a topic "Jetting 101" that you should be able to find but it's useful................

DC

[atc350xer]

You know, I got an extra carb when I bought the 70... wonder if that would work? I really appreciate everyone's input... It's been sitting there broken for 6-8 months... didn't even wanna work on it... 'til I found you guys!

[atc350xer]

Ugh. The extra carb didn't work out. It fit great, but idled so high it engaged the centrifugal clutch. Could not get it to settle down. So, I took the original carb apart AGAIN and cleaned the jets with carb cleaner and a piece of wire from a wire brush. Runs better, but still lean and adjusting it doesn't help. Runs great while I have the throttle on, or when it's choked. I could just say screw it and ride it like this, but my kid can't :(

[200XMichigan]

Let the jets soak longer, or use an air comp, if it is running better the second time you cleaned it, probably just needs a better clean. If it ran good when you got it you shouldn't have to change the jets, unless you changed something on the motor, or altitude. Use the aerosol carb cleaner and blast it through the brass jets. Did you remove the float and the valve that sits under it. Also don't just clean the jets, spray carb cleaner though the orifices the jets and air mixture screw in to. Every passage in carb. Clean and inspect the petcock too. Could be clogged even though you have a plastic tank.

[atc350xer]

Yeah, it is a plastic tank, but it had no in-line filter, even from the factory. It has one now. I am sure a chunk of dirt fell in the tank and started all this trouble. There are 4 lines of orifices around the jet, and five from top to bottom. I sprayed, poked the wire in, and held it up to the light. There was ONE little hole that wasn't a perfect circle... could that be the problem? Just one of the little holes out of 20?