Need help with an 883!!
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Stage IV
Joined: Nov 2015
Posts: 4
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From: virginia
Need help with an 883!!
During the summer I bought a 2006 883 sportster 18000 miles and it was running great with no problems. As of a month ago it started running pretty rough especially at idle and will back fire through the carb hard enough to blow the carb out of the intake tube when at idle. I've replaced the maf sensor,intake manifold gaskets, had harley go through the carb and made sure the jetting was correct, and replaced the crankshaft pos. Sensor. Don't really want to take the bike to harley and have them figure it out, too much pride I guess. Any help would be great. Thank you.
Seasoned HDF Member
Joined: Jul 2011
Posts: 27,097
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From: Frozelandia, Minnysota
If all you and the dealer did were done right, seems to me it's narrowing down to ignition, especially if it doesn't do it till it's warmed up enough to push in the enrichment ****. If you haven't already, you could do the coil test (in manual, and you tube videos). There's also a timing sensor under the timing cover; they rarely seem to go bad, though, probably the last thing I'd check. Most expensive part in the ignition is the ignition module, and I don't know of a way to test it. I have heard of heating it with a hair dryer to see if it starts cutting out, but if the bike is rough when cold, heat wouldn't be the problem.
Hopefully someone with some actual experience in this area will chime in. Also, try posting the problem in XLforum.net, some helpful folks there, too.
Hopefully someone with some actual experience in this area will chime in. Also, try posting the problem in XLforum.net, some helpful folks there, too.
Thread Starter
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Stage IV
Joined: Nov 2015
Posts: 4
Likes: 0
From: virginia
If all you and the dealer did were done right, seems to me it's narrowing down to ignition, especially if it doesn't do it till it's warmed up enough to push in the enrichment ****. If you haven't already, you could do the coil test (in manual, and you tube videos). There's also a timing sensor under the timing cover; they rarely seem to go bad, though, probably the last thing I'd check. Most expensive part in the ignition is the ignition module, and I don't know of a way to test it. I have heard of heating it with a hair dryer to see if it starts cutting out, but if the bike is rough when cold, heat wouldn't be the problem.
Hopefully someone with some actual experience in this area will chime in. Also, try posting the problem in XLforum.net, some helpful folks there, too.
Hopefully someone with some actual experience in this area will chime in. Also, try posting the problem in XLforum.net, some helpful folks there, too.
Seasoned HDF Member
Joined: Jul 2011
Posts: 27,097
Likes: 4,676
From: Frozelandia, Minnysota
I've heard an ignition module can do that, high idle because the advance curve isn't working right. Carb adjustment, too, but usually only when it's warmed up and off the enrichment circuit. I've been real lucky with having no ignition problems, only know what I've heard from other folks - if they were right.
Does the bike have stock mufflers? If someone put lower restriction mufflers on it, or punched out the baffles (it would be very loud if they did), it would run real lean, and chances are a Harley shop mechanic would set up the carb for a stock muffler. That could account for some backfiring, but not taking a long time to idle down. Carbs usually go bad kind of gradually, but electronics can screw up instantly.
Does the bike have stock mufflers? If someone put lower restriction mufflers on it, or punched out the baffles (it would be very loud if they did), it would run real lean, and chances are a Harley shop mechanic would set up the carb for a stock muffler. That could account for some backfiring, but not taking a long time to idle down. Carbs usually go bad kind of gradually, but electronics can screw up instantly.
Thread Starter
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Stage IV
Joined: Nov 2015
Posts: 4
Likes: 0
From: virginia
I've heard an ignition module can do that, high idle because the advance curve isn't working right. Carb adjustment, too, but usually only when it's warmed up and off the enrichment circuit. I've been real lucky with having no ignition problems, only know what I've heard from other folks - if they were right.
Does the bike have stock mufflers? If someone put lower restriction mufflers on it, or punched out the baffles (it would be very loud if they did), it would run real lean, and chances are a Harley shop mechanic would set up the carb for a stock muffler. That could account for some backfiring, but not taking a long time to idle down. Carbs usually go bad kind of gradually, but electronics can screw up instantly.
Does the bike have stock mufflers? If someone put lower restriction mufflers on it, or punched out the baffles (it would be very loud if they did), it would run real lean, and chances are a Harley shop mechanic would set up the carb for a stock muffler. That could account for some backfiring, but not taking a long time to idle down. Carbs usually go bad kind of gradually, but electronics can screw up instantly.
Outstanding HDF Member
Joined: Oct 2009
Posts: 2,488
Likes: 30
From: Maryland near DC
first things first, have you checked the battery connections and the voltage from the regulator at idle???,I would check the sparkplug wires (ohm them and check for burned ends inside of the boots) next I would do a compression test.. the damn thing might just need tune up..
Thread Starter
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Stage IV
Joined: Nov 2015
Posts: 4
Likes: 0
From: virginia
first things first, have you checked the battery connections and the voltage from the regulator at idle???,I would check the sparkplug wires (ohm them and check for burned ends inside of the boots) next I would do a compression test.. the damn thing might just need tune up..
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1st Gear
Joined: Nov 2015
Posts: 5
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From: Oregon
Maybe need a different pilot jet? The dealer may have tried to get the jetting right based on you telling them which exhaust, but it sounds like you just brought the carb in and not the bike to save money. I would think it would be impossible to jet the bike properly without it being in front of them to know if it is spot-on. This would effect idle to about 1/3 throttle. Of course this is just a simple guess. But the bike should not have run the same without mufflers as with mufflers unless there was no baffles at all in the muffler - that kind of change (straight pipes/slipons) should cause the bike to run differently.
Last edited by oregoncoast; Nov 20, 2015 at 09:17 AM.
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Outstanding HDF Member
Joined: Oct 2009
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From: Maryland near DC
go back and recheck the plug wires to make sure they are on all the way and check the voltage at idle...if there is a electrical issue it may only show up at idle as that is when the alternator is making the least amount of electricity..loose battery terminals can cause the same issues...
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