Try disconnecting the throttle cable at the carburetor and see if idle remains high. (I) want you to isolate issue to the new cable installation only and not a combination of cable and other.
I believe the handle/trigger position is critical to throttle so be sure the distance of the trigger to body of unit has not increased.
Comment below and I assist further if need be.
Testimonial: "Thank you. I discovered that the carburetor end nipple was not properly seated and effectively made the cable shorter and therefore held the throttle slightly open. But thanks for your advice."
SOURCE: My 1977 gs550 idles way too high...and i cannot
the thumb screw is not your problem adjust it at the carb
SOURCE: 1987 volvo 244 intermittent fast idle floods after shut down
The coolant temp sensor sends signal to the ECU and the ECU adjusts the idle RPM. When the coolant is cold, the engine requires more fuel to sustain idle with thick oil (oil gets thicker & more viscous when cold). This makes the engine to idle at faster RPM but it should settle down to 850 RPM or so after the coolant warms up. The sensor is nothing but a thermistor; a device that changes electrical resistance according to the coolant temperature.
SOURCE: My KTM lc4 640 running problems
Check your valves. they might be tight. possible shimming required there to get them back to spec
SOURCE: High idling four wheeler
Sounds like it's getting air between the carby and the motor. Check the intake manifold is not leaking
SOURCE: When I start my 10hp mercury outboard after
Be sure to run the recommended fuel mix. most modern 2 stroke outboard engines run on 100 to 1, some times the mix is on a decal inside the cowl.
Cheers, Timo.
Too fast an idle speed. If an engine without
computerized idle speed control is idling too fast and refuses to
come down to a normal idle speed despite your best efforts to back off the
carburetor idle speed screw or air bypass adjustment screw (fuel injection),
air is getting past the throttle somewhere. Common leak paths include the
carburetor and throttle body gaskets, carburetor insulator spacers, intake
manifold gaskets, and of course, any of the engine's vacuum fittings, hoses and
accessories. It is even possible that leaky O-rings around the fuel injectors
are allowing air to leak past the seals. Another overlooked item can be a worn
throttle shaft and a defective idle speed speed control motor/valve stuck in
the extended (high idle speed) position/throttle position sensor. Also the
throttle plate could be binding in its bore and kinked accelerator cable,
coolant temperature sensor might not be operating properly misleading the computer
that the engine is still cold and computer throwing fuel at it raising the idle
speed.----------
Getting this possibilities checked will help.Thanks.Helpmech.
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