Sportster Models 883, 883 Custom, 1200 Custom, 883L, 1200L, 1200S, 1200 Roadster, XR1200, and the Nightster.
Sponsored by:
Sponsored by:

Front cylinder is not firing

  #1  
Old 09-06-2011, 05:58 PM
SgtMic's Avatar
SgtMic
SgtMic is offline
Outstanding HDF Member
Thread Starter
Join Date: Apr 2009
Location: WA State
Posts: 2,358
Received 53 Likes on 47 Posts
Default Front cylinder is not firing

I just replaced the front and rear cylinder rocker cover gaskets.
While I was in there I decided to put new plugs and SE wires on.

Went to fire it up and only the rear cylinder is firing.
Checked the front spark plug and it is firing.
Rechecked all the connections I had to undo for the gaskets and everything is good to go.

Any ideas or input?
 
  #2  
Old 09-06-2011, 06:22 PM
BurpleHugger's Avatar
BurpleHugger
BurpleHugger is offline
Cruiser
Join Date: Apr 2010
Posts: 243
Received 3 Likes on 3 Posts
Default

Originally Posted by SgtMic

Went to fire it up and only the rear cylinder is firing.
Checked the front spark plug and it is firing.
You meant to say "the front spark plug is NOT firing" correct?

New plugs, new wires, no fire. I would triple check the new wires and leads to the coil.

Test the coil at the primary and secondary terminals for that cylinder. Is your set up single or dual fire?
 
  #3  
Old 09-06-2011, 06:23 PM
BurpleHugger's Avatar
BurpleHugger
BurpleHugger is offline
Cruiser
Join Date: Apr 2010
Posts: 243
Received 3 Likes on 3 Posts
Default

Semper Fi by the way
 
  #4  
Old 09-06-2011, 06:51 PM
SgtMic's Avatar
SgtMic
SgtMic is offline
Outstanding HDF Member
Thread Starter
Join Date: Apr 2009
Location: WA State
Posts: 2,358
Received 53 Likes on 47 Posts
Default

Semper FI!!

It is sparking. If I take the plug out, connect it and ground it to the cylinder, I get a spark. So it is firing.
Single fire on an '08 1200C.

I just got done testing this out:
Tested out the coil on both cylinders and I used the old wire from the rear cylinder since it's long enough to reach both cylinders.

Tested these individually one at a time:
Front coil plug to front cylinder, nothing.
Front coil plug to rear cylinder, nothing.
Rear coil plug to front cylinder, nothing.
Rear coil plug to rear cylinder, fires up.

I'm assuming the coil doesn't know the difference between the front and rear.
 
  #5  
Old 09-06-2011, 07:28 PM
BurpleHugger's Avatar
BurpleHugger
BurpleHugger is offline
Cruiser
Join Date: Apr 2010
Posts: 243
Received 3 Likes on 3 Posts
Default

Sounds like you may not be getting fuel in there (stuck intake valve?) Or not ENOUGH spark to combust. Try the old plugs and wires, any difference?
 
  #6  
Old 09-06-2011, 07:32 PM
BurpleHugger's Avatar
BurpleHugger
BurpleHugger is offline
Cruiser
Join Date: Apr 2010
Posts: 243
Received 3 Likes on 3 Posts
Default

Sorry, ,is understood, disregard my last post. Got a spare coil to swap out? Test it with an ohm meter to know for sure that its bad. Don't know what the specs are for an 08.
 
  #7  
Old 09-06-2011, 07:39 PM
BurpleHugger's Avatar
BurpleHugger
BurpleHugger is offline
Cruiser
Join Date: Apr 2010
Posts: 243
Received 3 Likes on 3 Posts
Default

Sorry, ,is understood, disregard my last post. Got a spare coil to swap out? Test it with an ohm meter to know for sure that its bad. Don't know what the specs are for an 08.
 
  #8  
Old 09-06-2011, 11:02 PM
SgtMic's Avatar
SgtMic
SgtMic is offline
Outstanding HDF Member
Thread Starter
Join Date: Apr 2009
Location: WA State
Posts: 2,358
Received 53 Likes on 47 Posts
Default

I don't have a spare coil.

I ended up removing both rocker covers on the front cylinder. Something I also noticed is the spark plug doesn't appear to have any gas on it. Sight or smell.

I'm guessing the intake is stuck in the closed position. Not sure how to test or fix that at this point.
 
  #9  
Old 09-07-2011, 02:47 AM
SgtMic's Avatar
SgtMic
SgtMic is offline
Outstanding HDF Member
Thread Starter
Join Date: Apr 2009
Location: WA State
Posts: 2,358
Received 53 Likes on 47 Posts
Default

Fixed.
Give me the award for the day.

Apparently I also needed to check the connectors that I didn't disconnect.
The connector to the front cylinder fuel injector had come loose.
Pushed it back on and she fired right up with both cylinders firing.
 
  #10  
Old 09-07-2011, 09:43 AM
BurpleHugger's Avatar
BurpleHugger
BurpleHugger is offline
Cruiser
Join Date: Apr 2010
Posts: 243
Received 3 Likes on 3 Posts
Default

Originally Posted by SgtMic
Fixed.
Give me the award for the day.

Apparently I also needed to check the connectors that I didn't disconnect.
The connector to the front cylinder fuel injector had come loose.
Pushed it back on and she fired right up with both cylinders firing.
:icon _clapclap:

Ol' Marine Corps "sticktoitiveness"
 

Thread Tools
Search this Thread
Quick Reply: Front cylinder is not firing



All times are GMT -5. The time now is 10:19 PM.