Horizontal shaft, 23.0 Hp Vanguard engine, model 386447-3079-G1, equipped with (according to the Service Manual) a Nikki carburetor.
1. What is the proper initial setting of the Idle Mixture Screw? My service manual says the initial settings on the Idle Mixture Screws should be 3/4 of a turn COUNTERclockwise (CCW) from a "lightly seated" position (fully closed). HOWEVER, if you read the (somewhat generic) information on the Vanguard website regarding carburetor adjustments, it says the initial position of the Idle Mixture Screw should be 1-1/2 turns CCW - That's a 2X difference. I'm assuming the Service Manual is correct and the website doesn't address every Vanguard engine & carburetor available, but if anyone has any special guidance here, I would appreciate it. BTW - the engine starts & runs on either Idle Mixture Screw setting, but it does smell a little rich at the 1.5 turns CCW setting.
2. Is the Governed Idle Spring supposed to be disconnected when I do the final Idle Mixture Screw adjustments? The Service Manual says for the FINAL Idle Mixture adjustment, it should be performed with the engine running at 1200 RPM. I am unable to get my engine to idle smoothly at that slow of speed. It surges between 1200 -1500 RPM, but never runs smoothly and repeatedly dies. If I hold the Throttle Lever against the Idle Speed Screw as the Manual states, it most definitely will die. The next section in the Manual says after the Idle Mixture is finalized, the governed Idle Tang should be adjusted so the engine operates at 1750 RPM (I have the red Governed Idle Spring), so is the Governed Idle Spring supposed to be disconnected when I set the engine RPM to 1200 and do the final Idle Mixture Screw adjustments?
1. What is the proper initial setting of the Idle Mixture Screw? My service manual says the initial settings on the Idle Mixture Screws should be 3/4 of a turn COUNTERclockwise (CCW) from a "lightly seated" position (fully closed). HOWEVER, if you read the (somewhat generic) information on the Vanguard website regarding carburetor adjustments, it says the initial position of the Idle Mixture Screw should be 1-1/2 turns CCW - That's a 2X difference. I'm assuming the Service Manual is correct and the website doesn't address every Vanguard engine & carburetor available, but if anyone has any special guidance here, I would appreciate it. BTW - the engine starts & runs on either Idle Mixture Screw setting, but it does smell a little rich at the 1.5 turns CCW setting.
2. Is the Governed Idle Spring supposed to be disconnected when I do the final Idle Mixture Screw adjustments? The Service Manual says for the FINAL Idle Mixture adjustment, it should be performed with the engine running at 1200 RPM. I am unable to get my engine to idle smoothly at that slow of speed. It surges between 1200 -1500 RPM, but never runs smoothly and repeatedly dies. If I hold the Throttle Lever against the Idle Speed Screw as the Manual states, it most definitely will die. The next section in the Manual says after the Idle Mixture is finalized, the governed Idle Tang should be adjusted so the engine operates at 1750 RPM (I have the red Governed Idle Spring), so is the Governed Idle Spring supposed to be disconnected when I set the engine RPM to 1200 and do the final Idle Mixture Screw adjustments?
Proper Idle Mixture Screw & engine RPM settings? - Briggs 23 Hp Vanguard
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