Question about Craftsman 25cc Gas Line Trimmer

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Setting the rpm

Setting the operating rpm

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To identify the idle screw adjustment push in and and out with the gas throttle handle and look at the carburetor for a little finger that moves in unison with your movements. That finger comes to rest against a tapered screw - the latter is the idle adjustment. Clockwise increases the speed and vice versa. Adjust so unit runs smoothly at low speed - too slow and it will stall. Experiment.

Posted on Nov 24, 2013

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Posted on Jan 02, 2017

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I set my trucks RPM on a low setting, from inside, no engine tampering. Now it is warmer. My truck is still running at a low RPM, seems too low for current temperature. How can I adjust my RPM?


how did you adjust a pre-programmed ECU idle settings ??? please be more specific

the vehicle's ECU is pre-programmed to run higher than 1000 rpms while in "open loop mode" then idle back down to ~750 rpms once the engine reaches operating temperature "closed loop mode"

did you tap into the OBD 2 port and used a laptop to change the settings?

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How can i increase or decrease settings? rpm low when warming and running low during normal operations? checked timing it's a 0 tdc. increasing idle speed works with rpm setting and carb?


What is Make, Model ,Year, and Engine?

Does this have a distributor?

Many GM's run a few degrees advance of TDC (Top Dead Center) on ignition timing.

If it has a carburetor, be sure to unhook and plug the vacuum dashpot advance line .

It sounds to me me like you're experiencing a retarded timing condition, which, among other things could cause a slower than normal idle.

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I have a primary jet and secondary jet in the carburator of the 500 gl silverwing . and the jets I have is 75 and 125 which goes where . and what should be the setting on the air jet ?


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There no adjustment for idle, control by computer, TPS reading should be .50 volt's, you could have a vacum leak, check vacum line and check for vacum leak at base of intake manifold.

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Problem solved, sort of-
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But my yellow diagnostic light is still flashing 5 times. My door is operating correctly, but the diagnostic feedback is still not completely happy with my RPM sensor. So I will keep and eye on it.

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