04 LT-Z250 Won't idle - Suzuki Z400 Forum : Z400 Forums
 
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post #1 of 4 (permalink) Old 01-01-2016, 07:02 PM Thread Starter
DmC
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04 LT-Z250 Won't idle

My Z250 won't idle. it will only idle if the choke is engaged as soon as you disengage the choke it dies, ive tried adjusting the idle screw from way to low to way to high and it makes no difference. Ive cleaned the carb, checked all the boots, and have even done the raptor petcock mod but nothing has fixed it, it still will not idle. Any ideas ?
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post #2 of 4 (permalink) Old 01-01-2016, 09:10 PM
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The cable is good at the thumber? If you give it a little throttle and hold it will it idle?

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post #3 of 4 (permalink) Old 01-01-2016, 11:54 PM
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Are you sure you got the pilot jet clean? The same goes for the fuel screw. Also, where is the fuel screw set? Your problem lies with one of those things, I'm pretty sure.

The pilot jet is easy to miss. I'm not familiar with that carb, but sometimes they are hidden up in the housing. Also, it's a tiny hole, and hard to verify if it's open. This is normally the first thing to plug when a carb gets yucky from sitting.

The fuel screw is an adjustment that directly supplies fuel for the engine to idle on. Turned further in restricts fuel and makes it leaner. Turned further out adds fuel and makes it richer. Generally these will need to be somewhere between 2-3 turns out as a base line. (It has to come through the pilot jet first). I've seen some people tighten this up instead of setting them. Again, not being familiar with this carb, if it has a fuel screw, it would be between the bowl and the intake side of the carb, usually sticking straight down in front of the bowl.

Now days, it's often for the passage leading to this screw adjuster to be plugged. (Thank the EPA for that) To be serviced or adjusted, the plug has to be pulled out. A drill bit and a wood screw will get the job done. If the fuel screw gets dirty, it will need to be removed, cleaned, and re-adjusted. Starting at 2-3 turns out will get you idling. I like setting them to the fastest idle speed with the engine running.

The only way it wouldn't have a fuel screw adjustment would be if it has an air screw. These are usually sticking out the side of the carb near the idle speed adjuster. These also have a specific setting. They meter air to the idle circuit.
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post #4 of 4 (permalink) Old 02-11-2019, 03:25 AM
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Similar issue with me. The carb was the prob. Had the carb cleaned and while doing so a broken screw was found inside. Now it starts very quickly and purrs like a kitten.
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