Question about 2000 Harley Davidson XL 1200 C Sportster Custom
Had to extend wiring due to new handle bars, went to start the bike but not enough spark getting to plugs ( back plug has very weak spark whil ethe front has none ) could the coil be faulty or is there a wire from the run or kill switch not connected properly that I missed?.
Probably pinched wires under the controls or you skinned the insulation off of a wire while pulling them through the bars.
Posted on Oct 10, 2013
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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
Since you have thrown the entire ignition system at it, let's think about fuel. If you were running out of gas it would act as you described. I would start by removing the float bowl. Be careful not to spill any gas because we want to look at the level. It should be over half full. Check the float movement. You should be able to push it up without resistance. Looking from the bottom remove the phillips screw that retains the float axle and the float and needle valve should fall out. If the needle valve has three sides or if the rubber tip is worn, replace it. The 3 sided valves have a tendancy to stick closed and all dealer stock should be the 4 sided version by now. After you re-install the float, leave the bowl off and follow the small vacuum hose from the petcock to the carb. Pull it off at the carb end. Look to make sure it isn't damaged. **** lightly (sorry) or use a vacuum pump on the hose. With the petcock on and gas in the tank, a healthy stream of fuel should pour from the needle valve. If not, the petcock diapragm is shot. If none of this helps, take it for a ride and when it acts up, crack the fuel cap loose and if it takes off the vent in the cap is malfunctioning.
Posted on Jan 05, 2009
SOURCE: not getting spark all the time
I think the only problem you have is a loose or corroded connection somewhere. Check your module plug connectors for corrosion (green junk). Check wires to coil, kill switch and other connections for loose or frayed wires or connectors.I doubt that you have a bad electrical component since it starts sometimes but it is possible. Let us know what you find.
Posted on Mar 20, 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
Plugs foul for a couple reasons, engine in poor condition (worn rings - poor compression), wrong oil, wrong plugs, bad riding conditions, cheap fuel, out of tune, carb out of tune.
You are not mixing your fuel with oil are you?
You might need a carb tune up (Id start by adding some injector cleaner to the fuel according to the bottle instructions.
You might put a hotter plug in your engine, one or two range increase.
If you will go to a good auto parts store, they will probably have a chart of assorted plug conditions and their cause. The counter man may be able to make a recommendation to you.
Posted on Oct 18, 2009
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