Question about 1993 Harley Davidson XLH Sportster 883
One day my bike wouldnt start and my father first pulled plug wire to see if it was firing and it was ended up being fowled plugs put new plugs in and it fired up went down the road and speedo was registering right speed but miles were running wild like with in 1 mile speedo said 10,000
The timing of the plug change is probly chance Your speedo is a cable run from your front axle spacer between fork tube and Bering a spark plug or a wire could only put out the speedo light not affect the speed sensors caus there isn't one one a 95 sporty I only know cause I took off every thing on my chopper but headlamp tail lamp and starter switch and I had to make a custom spacer to take the place of my speed sensor slash Bering after I ditched my dash years ago on my 93 evo sporty
Posted on Apr 20, 2012
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Posted on Jan 02, 2017
SOURCE: Rear cylinder not firing
The first thing I would do is replace the spark plugs again. You can foul a plug and it will cause you more problems than you can ever imagine. I see you have done all the logical things that I would recommend but I did not see you have replaced the plugs after the 200 miles. You would be surprised at how many times a $2.00 part can cause fits beyond belief.
Posted on Dec 08, 2008
SOURCE: 2002 roadking misses
Here is a list of things you can start with:
1. Spark plugs in poor condition or partially fouled.
2. Spark plug cables in poor condition and shorting or leaking.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, ECM, or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose connection at battery terminals,
ignition coil or ECM connector.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in fuel system.
9. Fuel tank vent system plugged.
10. Air leak at intake manifold or air cleaner.
11. Loose or dirty ECM connector.
12. Faulty Sensor(s): Manifold Absolute Pressure (MAP),
Crank Position (CKP) or Oxygen (O2).
13. Incorrect valve timing.
14. Weak or broken valve springs.
15. Damaged intake or exhaust valve.
16. Partially plugged fuel injector(s).
Posted on Jun 06, 2009
One more thing to try...loosen the gas cap when it starts misbehaving. If the tank is losing its vent, then it can act that way.
Posted on Jul 22, 2009
no your totally wrong the backfire is bcause if u juice the throttle there is excess fule in the cylinders witch give it no where to go so it ignights and creates a backfire witch is not necessarly bad.
Posted on Sep 15, 2009
Backfiring out of the exhaust is usually an ignition problem. Unburned fuel is getting into the exhaust system because it's not being ignited in the cylinder. When the engine fires on that cylinder again, it ignites the raw fuel in the exhaust causing the pop that people call a backfire. I'd investigate the ignition system. Connect a timing light to each of the spark plug wires if it has a single fire ignition or either of them if the ignition system is the stock dual fire. Start the engine and watch the timing light to tell if the engine is missing as the light will miss a flash.
Posted on Jun 05, 2011
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