[sandbur69]

Hey guys new here, im trying to tune my carb because the thing is running rich and ive replaced all the needles and cleaned everything. problem is is its not dying when i screw the idle mixture screw in all the way and it should right? any help is appriciated thanks.

 

[shadetree]

welcome to the forums. what carb kit did you replace the old parts with ?.

 

[Goober]

This is a QA03A OEM carb?

You may have another oring stuck up in there or you pilot jet assy out of order.
Here’s a pic of an old one; supposed to be in this order.

You might have too much tension in your throttle cable.

 

[sandbur69]

cant remember... i got it from honda though.

 

[sandbur69]

that might be the problem. let me pull that needle out and check for them orings.

 

[sandbur69]

This is a QA03A OEM carb?

You may have another oring stuck up in there or you pilot jet assy out of order.
Here’s a pic of an old one; supposed to be in this order.

You might have too much tension in your throttle cable.

yes its a QA03A carb. now is that one you pulled out supposed to have 2 rings on it? mine just had the one o-ring at the needle end but theres nothing up by the spring.

 

[Goober]

This is a QA03A OEM carb?

You may have another oring stuck up in there or you pilot jet assy out of order.
Here’s a pic of an old one; supposed to be in this order.

You might have too much tension in your throttle cable.

yes its a QA03A carb. now is that one you pulled out supposed to have 2 rings on it? mine just had the one o-ring at the needle end but theres nothing up by the spring.

On the needle there should be a spring, a tiny washer and then the single oring last

 

[sandbur69]

This is a QA03A OEM carb?

You may have another oring stuck up in there or you pilot jet assy out of order.
Here’s a pic of an old one; supposed to be in this order.

You might have too much tension in your throttle cable.

yes its a QA03A carb. now is that one you pulled out supposed to have 2 rings on it? mine just had the one o-ring at the needle end but theres nothing up by the spring.

On the needle there should be a spring, a tiny washer and then the single oring last

ok, i dont have the washer on there let me do that. And the butterfly valve should be just barely open at idle right? Because i noticed the air passage way around it and figured thats all for the idling system

 

[Goober]

Your (choke) starter valve seal may be bad.

See the conical shape of the seal? If it’s worn or cracked you’ll also get a rich condition

 

[sandbur69]

Ok. I will check that after work. Thanks for the advise btw guys. This was my grandpas four wheeler that I grew up on. He passed away and its just been sitting in the weeds for years.

 

[shadetree]

make sure you got all the parts ( washer ) out of the tiny pilot jet screw hole !!, they sometimes stick down in there, as well as the tiny o-ring.

 

[Goober]

Yup ^^^ like Shadetree said look in the hole make sure nothing is stuck up in there. Especially look in the pilot jet hole in the carb throat sometimes the tip breaks off in the hole. Be very careful when you are seating the pilot screw–touching not tightened

I attached a pic of the bottom of a qa03a

And of a typical pilot jet setting looking into the carb throat. If you can see the tip but not feel it with your fingernail then you’re close.