Missing Question...
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Tourer
Joined: Mar 2014
Posts: 326
Likes: 6
From: Idaho
Missing Question...
My bike has started missing sporadically. The other day I was cruising along at a steady 70-75 mph and it just missed...it's done that a few times. It seems to back fire out of the carb and exhaust simultaneously when it misses. Is there any chance this could just be a spark plug. I've checked for loose wires and cannot find any (other than a broken horn wire). With that being said, I cannot get to a whole lot of my wiring without tearing things apart. I can't even get to all of my coil wires without pulling the tank. I can get my fingers to the bottom two screws on the coil and they feel tight but there is no way I can get to the third one. A guy told me that it could be a bad plug acting up sporadically. Does this sound plausible? I changed out the plugs today.
Road Captain
Joined: Aug 2012
Posts: 625
Likes: 102
From: New Albany, Ms.
Possible bad ignition switch
My 96 FXDL developed the same symtoms, couple months back. About the 3rd time it backfired & hesitated,( over the course of a couple of days), I glanced down at the speedometer & saw the needle fall & rise back up, in less than a second or two, without ever taking my hand off the throtle. My speedometer reads off a sensor in the transmission. Replaced the ignition switch & solved problem. Don't know of a way to check switch. hth
Ride Safe,
Harold
Ride Safe,
Harold
Last edited by LowriderHarold; Oct 5, 2014 at 11:18 PM.
Thread Starter
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Tourer
Joined: Mar 2014
Posts: 326
Likes: 6
From: Idaho
My 96 FXDL developed the same symtoms, couple months back. About the 3rd time it backfired & hesitated,( over the course of a couple of days), I glanced down at the speedometer & saw the needle fall & rise back up, in less than a second or two, without ever taking my hand off the throtle. My speedometer reads off a sensor in the transmission. Replaced the ignition switch & solved problem. Don't know of a way to check switch. hth
Ride Safe,
Harold
Ride Safe,
Harold
Road Warrior
Joined: Dec 2007
Posts: 1,666
Likes: 3
From: Styxville
I would check/sh!tcan the vacuum operated fuel petcock. I had symptoms like yours a few weeks ago and found the vacuum shut-off valve was stuck half-open. So it would start and run just fun, but miss and splutter and carry on when I gave it a big handfull of throttle under load.
Took the vacuum diaphragm out of the petcock and put on a flat blanking plate, and did away with associated vacuum hose and all came good again.
Took the vacuum diaphragm out of the petcock and put on a flat blanking plate, and did away with associated vacuum hose and all came good again.
Tourer
Joined: Sep 2010
Posts: 461
Likes: 8
From: western CT
My bike has started missing sporadically. The other day I was cruising along at a steady 70-75 mph and it just missed...it's done that a few times. It seems to back fire out of the carb and exhaust simultaneously when it misses. Is there any chance this could just be a spark plug. I've checked for loose wires and cannot find any (other than a broken horn wire). With that being said, I cannot get to a whole lot of my wiring without tearing things apart. I can't even get to all of my coil wires without pulling the tank. I can get my fingers to the bottom two screws on the coil and they feel tight but there is no way I can get to the third one. A guy told me that it could be a bad plug acting up sporadically. Does this sound plausible? I changed out the plugs today.
Outstanding HDF Member
Joined: Oct 2010
Posts: 2,706
Likes: 14
From: Near Frankenmuth, MI
As crazy as it sounds check your battery connections. Wire brush them clean of any rust, put some dielectric grease on them and clamp them down good and tight. Be sure to check the other end of the cables too, usually ground to the frame or a tranny bolt, and hot to the solenoid.
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