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Hello, my name is Steve. I recently purchased a 2005 Harley Softail Standard FXSTI. Fuel injected. When I reach out or am heavy on the throttle it losses power spits and sputters. It seems it only does this after about 30 min of riding. I know it isn't the fuel. I charged the battery and it almost stopped. Please help

Posted by Steve Schnuck on

  • Steve Schnuck Mar 12, 2019

    Today I started by checking the battery connections and the battery. It checked out great. The battery tested at 12.98.
    My load test starting it was at 10.
    At a idle it was pushing 14.36.
    At 2rpm it was pushing 14.44.

    I then checked the continuity on the stator. That went fine.
    I changed the plugs. Ran my multimeter on my plug wires. That was good.
    I checked the coil. It was fine.
    I plan to check the crank position sensor, fuel injectors, vacuum leak or a leak from the hoses from the fuel pump in the tank.
    Thanks in advance



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It sounds like you are having an electrical issue. If your bikes system is not being supplied with at least 12.6+ volts, it’s starving to supply enough energy to maintain. Ensure that your charging system is working. Try putting some fuel injector cleaner through the system, as well.
It sounds like you may be picking up some trash, as well.
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Posted on Mar 12, 2019


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  • 5660 Answers

SOURCE: when riding 2005 fuel injected harley road king,

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


iain kelly

  • 311 Answers

SOURCE: My '05 EFI Softail Classic just quits while

this may help,try checking that your fuel tank is venting properly,if it has a blocked vent then it will create a vacuum in the tank and will not allow fuel to drop to the carbs,once the engine has stopped the suction from the carbs to the tank stops,the vacuum then disappears and the fuel can then run to the carbs,my bike did something similar and it turned out to be a blocked vent....hope this helps

Posted on Jul 16, 2009

Oscar Agnes

  • 347 Answers

SOURCE: 1990 mazda b2200 fuel injection after about 30 min

check fuel filter and fuel pump. replace if not functioning.

Posted on Oct 03, 2009



  • 4565 Answers

SOURCE: Harley spits and sputters.

Unless an aftermarket device has been installed on your bike, you must take it to a dealer to get the fuel map reworked.

Posted on May 03, 2010


  • 623 Answers


What has been done to it lately? Suspect that first if anything has.
Probably the fuel has gone bad, after sitting all winter, you did put fresh gas into it right? I am guessing water from condensation and the ethanol gas. Don't use any "drygas" it will just put more alcohol in the gas tank which you do not want. You can try a product called "StarTron" too if the fresh gas does not help. Last thing I know is a product available at the motorcycle shop comes in a solid black plastic bottle that will make the water in the gas dissolve back into the gas so it can be burned, but I can not remember the name of it. All the shops up here where I am have it. And it was developed specifically because of the condensation/water problem the ethanol gas causes with motorcycles.
Pick up something called Sea Foam at WalMart and put some it the gas to help clean out the passageways and jets. The new ethanol gas is real bad on scoots.
Hope this helps.

Posted on May 25, 2010

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