Engine only runs at low idle and smokes

Question edited for clarity.
Question moved to model category.

Likely the IAC needs cleaning.

Low Rider Engine Shuts Off at Idle

Harley Davidson Forums https://www.hdforums.com > ... > Dyna Glide Models
Mar 29, 2009 - My 2007 Low Rider with 21,000 miles has begun shutting down when you release the throttle to idle. This occurs after the engine warms up, ...

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Adjusting idle with fuel injection?

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Off-idle stumbles, rough running

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You need to have a Ford dealer run an injector flow test, takes about one hour.

if this is happening when the foot is on the brake, then it is possible that the brake booster is leaking air and running the engine too lean.
check by idling without the foot on the brake

On the carb the cable closest to the right side of the bike is the throttle cable and the one closest to the left side is the idle cable. Right about the middle between the two is the idle adjustment screw. It faces out towards the air filter end of the carb . The engine should be at operating temperature with the enrichener off to set the idle between 950-1050 rpm. Turn the screw clockwise to increases idle speed and counterclockwise to decrease idle speed. EFI idle speed is computer controlled.

Hi Mark
Before you remove or try to adjust your low and high speed jets you should always count the number of turns it takes to lightly seat the idle mixture screw and high speed needle adjusting screws.
Be sure to write the number of turns down on a piece of paper so you will know how many turns from the seated position to open the jets when you go to reinstall them, or if you remove them for cleaning or replacement.
If you have aready tried to adjust them then the adjustments below should get it running for you for final adjustment when warm.
Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position.
Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm.
Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed.
Alway use the "lightly seated" method if you have not changed the screw settings.
Please take time to rate me
Bud

white smoke out of the exhaust would be a sign that it is burning coolant... if it goes away after it warms up, it could just be condensation inside the exhaust pipe. 1800 rpm is a very high idle, maybe have your IAC motor on the throttle body checked... check engine light? if so have the code read at your local auto zone.

run the fault codes
indicates an idle control sensor or other throttle / accelerator sensors

all engines have a rev limiter in them to keep from revving the engine too high,they all cut out about 1900 to 2000rpms.

First check the oil, not only the level but the smell
if its overfull and it smells like gasoline then the problem is that your carb is dirty or the float is sticking and flooding the engine with gas. If the oil is at the correct level then the problem is more likely the valve stem seals, as the engine warms they leak. I presume you have checked the airfilter is clean? The choke is comming off completely when you move the throttle cable? The LT 1000 is the entry level rider in the sears line. The engine usually starts wearing out in about 50 hours use. Remember the sweetness of low price is long forgotten with the bitterness of low quality!