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1990 suzuki ltf250 quadrunner poor idle

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The quad starts good and runs good if the choke is on just a little. I installed a carb kit and backed the screw out 13/4 turns to where it was . Any ideas?


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Once you install a carb kit (rebuild) things change within the performance of the carburetor.  Going back to the original setting means noting other then getting a starting point for adjusting.  

Do this and see if it helps:

Start the bike up and let it warm up. Take the choke off and let the bike idle.  

Start to turn the fuel air mixture screw in either direction (My guess would be out). Your looking for the engine to start to rev higher. That’s a good thing! Keep going and as the engine reaches it’s sweet spot you will know because it will start to decrease revving  if you go to far. So once the engine stops revving higher and starts to break up a little stop! Turn the screw back maybe 1/4 turn. Then you can lower the IDLE screw and get the engine to level off to a healthy idle.  

See how the bike runs after that. My guess would be somewhere around the 2 to 2-1/4 turns out would be where it needs to be. 

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