I am new to the forum so, I hope I am posting this in the right place.

I am looking for some helpful information.

When I started to work on this Bruin it was hard to start and would not idle or stay running. This ATV does not have many hours on it and looks like new. It is also completely stock. So, I removed the carburetor and disassembled it and soaked the carburetor body and parts in carburetor cleaner. I cleaned every piece and making sure all of the jets were clean before I put it back together.

Now, it starts first try and will idle great. But, as soon as you give it any throttle it will stall. I have drained the fuel tank and replaced with fresh fuel. The air filter is clean. I replaced the spark plug. I have check the valve clearance. I have also checked for any air leaks.

I was hoping someone may have run into this before and have some information or some idea what may be wrong that I am over looking.

Thank you.

 

How does it run with the choke on? How did the diaphragm look when you had it apart?

 

Before I cleaned the carburetor, the only way I could get it to half way idle was to have the choke on just a little. But after I cleaned it, it will idle fine. Then when you give it throttle it stalls and the choke does not make it any better. After it gets warmed up, the choke will make it stall. The diaphragm looks like new. This thing is driving me crazy.

Please let me know if you come up with anything.

Thank you.

 

When you removed the pilot jet did you note how many turns it was out from its seated position?

 

I've got an 04 Bruin for my wife also. Haven't had the problem but my only suggestion is make sure things are tightened down good and all hoses hooked up. Make sure the fuel shut off is all the way open.

 

How did you make out with the issue?
I know it was a while ago.

 

Idles fine and dies out when you give it throttle?? May be an air issue. I know my wifes Polaris will do that if the air box isnt completely sealed.

 

Here is how to clean a carb.Disassembly and Cleaning of a Mikuni Round slide Carburetor but this part is important. Also used a wire to make sure the jets are clear and make sure the choke plunger slides smoothly.