Question about Harley Davidson Motorcycles
In this order : check for spark at both cylinders. check for proper fuel flow into carb, then check carb itself for gummed up, dirty jets. after that I;ll need more info
Posted on Nov 27, 2013
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Posted on Jan 02, 2017
In 1983 the carb used on this model was a kehin. They can be made to work well, with a couple of tweaks. First, on the top about midway, you will see a boss sticking straight up. Unless it has already been done, use a jabsaw and cut the top 1/8 inch off the top. Using a tiny improvised screwdriver, back out the idle adjustment screw which is down inside about a half a turn. Then remove the float bowl. You will see 2 tubes hanging down. Remove the rubber plug from the larger one and remove the low speed jet. The jet and the mixture screw are soft brass, so make sure you don't shred them. The jet has a number stamped on the end. Go to a knowlegble shop and get the next size up. For example if you have a 52 and they say the next size is a 54, that's what you want. Take the old jet with you and compair the size of the air holes along the side. They should be the same size. If not, they are selling you a jet for a cv carb and that will not work. (common mistake) Don't forget to shove that rubber plug back when you reassemble it. If I have your problem pegged correctly, the bike will be less cold blooded and the driveability will be much better.
Posted on Jan 06, 2009
Sounds like the intake manifold is leaking. The area where the leak usually happens, are those two rubber sleeves that go from the heads, (Cylinder heads) to the intake. Sometimes the clamp/s loosen up. Sometimes these rubber sleeves deteriorate, and cracks form.
This makes the engine backfire, pop, and idle fast.
The added air at the wrong time cause a backfire, when you let off the throttle. The added air causes the engine to pop, because the exhaust valve has sucked up some cold air.
The engine idles fast, because more air is being introduced, and not metered by the injection system.
(The exhaust valve thing. Exhaust valves are supposed to open, and let exhaust out right? Well there is a thing called Valve Overlap.
The Exhaust valve hasn't closed all the way yet, and the Intake valve is opening.
The 4 stroke engine, (Of which a Harley is), has these four strokes.
1.Intake Stroke. Fuel/air is sucked in.
2.Compression Stroke. The piston comes up and squeezes the fuel/air mixture.
3.Combustion Stroke. The spark plug lights the fuel/air mixture off.
4.Exhaust Stroke. The spent gases are expelled out.
Your Road King has one camshaft. There are four cam lobes on it.
Intake, Exhaust, Intake, Exhaust.
If you had the camshaft in your hand, and had the gear end facing you, look down the camshaft. You will see those egg shaped cam lobes. You will notice that No.1 cylinder Intake lobe is facing to the left.
No.1 Exhaust is facing to the right.
If you put a degree wheel on the gear end of the camshaft, and had the No.1 Exhaust lobe ramp nose facing straight up, you would see that it's about 110 degrees, before the Intake lobe ramp at .050 lift, comes into play. (The roller, of your roller lifter has raised the Exhaust valve up .050 inch) There is about 55 degrees before the Exhaust valve hasn't quite shut.
This is okay for normal running. Introduce a vacuum leak, and the surge of extra cold air, makes it pop.
Solution? I suggest checking to see if the clamps on those rubber sleeves are loose. You can also spray WD-40 towards the ends of each rubber sleeve, when the engine is idling, and see if it speeds up. Means, one or more, of those rubber sleeves has deteriorated.
Posted on Apr 25, 2009
SOURCE: 2003 HD Road King -
If you bike is equipped with a carburetor, the idle stop screw is located at the top of the carb on the right side. Counterclockwise turn slows the idle speed.
If you bike is fuel injected, a dealer or shop will have to set the idle speed electronically.
Posted on Sep 17, 2010
SOURCE: 2002 road king classic keeps
If your bike is fuel injected, there is nothing you can do. You must take it to a shop and let them set the idle speed. If it's equipped with a carb, remove the air cleaner cover and look at the square top on the carb. Just to the right of that cover is a screw, the throttle stop screw. Turn this screw clockwise to increase the idle speed. It should idle at about 1000 RPM.
Posted on Apr 07, 2011
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