Question about Harley Davidson XLH 1000 Sportster Motorcycles

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My 76 xlh is back firing a idol what could it be

It starts but back fires at idol but when i pull a plug wire off it stops back firing

Posted by Anonymous on

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  • Harley Davidson Master
  • 3,506 Answers

Bad spark plugs

Posted on Oct 14, 2014

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: FIRE and FUEL........NOT CRANKING !!!!!!!

check your ignition fuses but i think your problem is between your module and ignition switch if you got safty switches on there any one of them can cause that also.

Posted on Dec 06, 2008

  • 4 Answers

SOURCE: 07 ktm 450sxf wont start

take your carb out, clean the entire thing, that means every nook in that *****. do this and if still a problem write back because in most cases were n idiot is involved, this is the most over looked problem

Posted on Feb 17, 2009

  • 161 Answers

SOURCE: my '86 suzuki savage won't rev up it just back fires

When I had my savage it backfired all the time. They are known for this. Make sure you fuel is not to lean. Just adjust the fuel. You should adjust that and put some sea foam in it or ethenol treatment since most of the gas is terrible these days. Running 91 octane will help. Also you will want to replace the muffler gasket too.
When you replace that it will smoke which is normal.
I sold mine but I know the bike pretty well from tearing it apart due to trying to fix it from not running properly. Let me know if you have any more issues.

Posted on Sep 03, 2009

wd4ity
  • 4565 Answers

SOURCE: no fire at the plugs, battery fine, was running

Your Sporty has a fuse box somewhere. check the fuses to see if any are blown. Harley always puts their ignition systems on their own circuit. If you don't find anything that way, contact me directly at wd4ity@bellsouth.net and I'll scan a trouble shooting chart in and send it to you. There's more to the late models than there was with the early models.

Posted on Apr 21, 2010

  • 440 Answers

SOURCE: one cylinder spark plug not firing- replaced plug

Hi
With Ignition switch off :-
1st Check for bad connections, broken/crushed wires, continuity & resistance between the cap, HT lead, coil, ignition coil primary wires
2nd Disconnect the CDI unit from its connector & check for the same between the loom side of the connector back to the coil
3rd Check coil is earthed

If all OK suspect the CDI unit but double check everything first( there are some more checks as well), as these are very expensive

Ride safe
Bike-Doc

Please rate this solution well if it has helped !!
Any comments welcome


Posted on May 11, 2010

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2 Answers

I have a 98 4runner with 300000 miles. It's been running excellent but day before yesterday it started sputtering like a tractor when driving and idoling. Service engine light blinks when in overdrive, and...


First check the plugs. Pull the #6 plug and look at the electrode. If it's wet and/or dark (black) it's probably not firing correctly. What is the spark plug gap? Is the center electrode eroded (not flat on the end)? Swap in another plug and see if it makes any difference. How old are the plugs?

Second, check the wires. Did you replace the wire(s) when you changed the coil pack? They should be replaced periodically (I replace the wires on my '96 4Runner at about 100k miles). Check the wires with an ohmeter. Resistance should be around 16-17.5k ohms (depends on length).

FYI, each coil pack on your vehicle fires two spark plugs. The #6 spark plug is fired by the #3 cylinder coil pack, so if the coil pack were bad, most likely both the #3 and the #6 plugs would not fire.

Feb 14, 2015 | 1998 Toyota 4Runner

1 Answer

Its a poland 295 pro chainsaw still won't start


this problem could be due too a number of things first check to see if you have fire by pulling the spark plug then putting the wire back on it and pull the cord to see if it has fire i would not hold in hand unless you want a jump start for the day..If you have fire then check to see if you are getting fuel by adding a little fuel direct to carb not to much or you will flood it then see if it starts..If so ur lines may be stopped up...really them are the two main things to start the chainsaw fire and fuel..

Aug 10, 2014 | Garden

1 Answer

1974 1000 sporty, front cyl doesn't fire


Did you check the Ignition, Points and Condenser. Also check compression there may be a stuck valve.

Jun 18, 2014 | 1979 Harley Davidson XLH 1000 Sportster

2 Answers

2003 H-D Sportster 883 XLH backfire and sputter problem


There are two things that can cause what you describe: Lack of fuel, and lack of spark.

The easy way to eliminate is put an extra spark plug in your pocket....Ride the bike until it quits, then pull one plug wire, plug in your spark plug and hold the base of it against the block, and crank the engine, while observing the plug.

If you have spark, fuel flow issue is likely, check all filters, and strainers (in tank too). You can pull the fuel line and open the fuel valve and observe flow, but be careful of spark and fire, happens EASILY.

If you do not have spark, investigate the ignition system, if electronic, you can be overheating, usually requiring component replacement.

Apr 22, 2012 | Harley Davidson XLH Sportster 883...

1 Answer

Only one cylinder fires on my 1988 sporter could the plugs be foul


The plug and ignition wire would be the first thing to check. See if you're getting a spark to the missfiring cylinder. If you have a dual fire ignition, and have no spark, the problem will definitely be in the plug or wire.

Jun 25, 2011 | 1993 Harley Davidson XLH Sportster 883

1 Answer

Front plug not firing. Have swapped plug & wire, coil. Battery at 12.4 vdc. What might be the problem?


If you've swapped the wire and the plug and it still won't fire, check the compression. You need a minimum of about 75 psi for the cylinder to fire. It should be up about 100-120 psi. If you have the compression and fire, then the only thing left is fuel. You've probably got a vacuum leak at the intake to head junction. Replace the intake gaskets and the carb seal where the carb plugges into the intake.

Good Luck
Steve

Feb 14, 2011 | 1993 Harley Davidson XLH Sportster 883

2 Answers

79 harley ironhead 1000cc xlh no spark from coil coil is good and im geting power to both sides of coil


It sounds like your sensor in the timer cavity on the right side of the engine is bad. Disconnect the blue wire from the coil. Take a spark plug out of the engine, put it back in the spark plug wire, and lay it on the head. Turn the switch on and momentarily touch the blue wire to the coil. When you take the wire off of the coil, you should see a spark at the plug. The purpose of the sensor in the timer cavity is to stop the flow of current in the coil and initiate a spark.

Good Luck
STeve

Sep 21, 2010 | 1979 Harley Davidson XLH 1000 Sportster

1 Answer

FIRE and FUEL........NOT CRANKING !!!!!!!


check your ignition fuses but i think your problem is between your module and ignition switch if you got safty switches on there any one of them can cause that also.

Dec 04, 2008 | 1993 Harley Davidson XLH Sportster 883

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