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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 13th April 2007
nicksorg nicksorg is offline
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Sportster/Buell Model: Sportster XLH
Sportster/Buell Year: 1981
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Default 81 Sportster - Ignition Questions

My 81 has points ignition instead of the stock electronic ignition. Based on that, should I use a plug like the 4-5 for earlier sportsters vs. the 4R5? Also, should I be using a different coil than what came stock? Still troubleshooting a hesitation problem referenced in an earlier post.
Thanks.
Nick
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  #2  
Old 13th April 2007
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chrishajer chrishajer is offline
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The '71 - '78 XL with points called for a 4R plug, so I doubt using or not using an R plug is your problem.

The '71 - '78 used a 31609-65A coil, and when they went to electronic they went to a 31609-80 coil. I imagine the ohms were different there for electronic vs. points, but usually when you use the wrong ohm coil, it just burns up and fails, doesn't cause hesitation problems.

I don't really think either of these things are causing your problem, but I will look for your other thread...

--Chris
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  #3  
Old 13th April 2007
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IronMick IronMick is offline
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The one difference i am aware of is the spark plug gap: 030 for points, 040 for electronic.
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  #4  
Old 13th April 2007
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RcRacer RcRacer is offline
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I'm sure if you or anyone addressed this but did you verify that your advance mechanism is working correctly?
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