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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 5th December 2021
gotamotor gotamotor is offline
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Default No start after ultima ignition, thoughts?

Installed ultima ignition on 77 xlh
Blue and pink wires from modual to plug terminals on single fire coil, white wire from module and 12v wire from bike to center terminal on coil.
New resistor type spark plugs .40 gap, suppression core wires.
Static timed engine according to instruction, TDC compression stroke, TDC mark in timing inspection hole. Modual does its self test 1/4 second blink then, rotate module until red light comes on then back off till it just goes off. Tighten down
Set switches to advance curve setting #1,
Engine does not want to start but will pop with occasional loud backfire out of the pipes.
Has fuel flow, and confirmed it is getting spark at the plugs.
Any ideas what I may be missing?
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  #2  
Old 5th December 2021
gotamotor gotamotor is offline
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Default

Spark plug wires were reversed. Switched them and it started
Wasn't thinking about the fact I changed to single fire, used to plug direction not mattering with dual fire.
Thanks to tatro machine on YouTube
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  #3  
Old 5th December 2021
needspeed needspeed is offline
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Before I was able to post this you found the problem. I'm posting anyway.
Glad you found it.

When Using one single fire coil the blue and pink wire need to go to the proper terminals. Pink for rear cylinder, blue for front cylinder. Also the plug wires need to to be on the designated terminal.

Any chance you have them reversed? If unsure you could swap the plug wires as a check.
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Old 6th December 2021
gotamotor gotamotor is offline
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Default

Quote:
Originally Posted by needspeed View Post
Before I was able to post this you found the problem. I'm posting anyway.
Glad you found it.

When Using one single fire coil the blue and pink wire need to go to the proper terminals. Pink for rear cylinder, blue for front cylinder. Also the plug wires need to to be on the designated terminal.

Any chance you have them reversed? If unsure you could swap the plug wires as a check.
Thanks for the help need
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  #5  
Old 6th December 2021
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SHAKY DAVE SHAKY DAVE is offline
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Quote:
Originally Posted by gotamotor View Post
Spark plug wires were reversed. Switched them and it started
Wasn't thinking about the fact I changed to single fire, used to plug direction not mattering with dual fire.
Thanks to tatro machine on YouTube
exactly what i was goin to post.you will like ultima
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