Early or Late year 1978????? - Harley Davidson Forums: Harley Davidson Motorcycle Forum
 
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post #1 of 10 (permalink) Old 09-15-2011, 01:12 AM Thread Starter
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Early or Late year 1978?????

How does one go about telling if your FXS is an early or late 1978?
I am new to this bike and trying to get a manual for the bike - I notice they are divided between 1970-1978 and 1978 1/2 - 84.
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post #2 of 10 (permalink) Old 09-15-2011, 05:52 AM
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In 1978, the FXS had points ignition. In 1978 1/2, they changed over to electronic ignition.

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post #3 of 10 (permalink) Old 09-15-2011, 11:03 PM Thread Starter
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right on, thanks!
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post #4 of 10 (permalink) Old 09-16-2011, 05:09 AM
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but thats not saying you don't have a bike that might have had points, but was converted to electronic ignition
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post #5 of 10 (permalink) Old 09-16-2011, 05:30 AM
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Not so. It depends on the ignition.

1978 was the first year for electronic ignition for HD, but it was only a magnetic sensor/pick-up, and still retained the timing advance weights behind the timing plate. In 1980 (I believe) it went to full electronic, including a module to make all changes to timeing, and deletion of the advance weights.

http://www.bikebandit.com/showschematic/m563sch183496

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post #6 of 10 (permalink) Old 09-16-2011, 01:49 PM
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Wasn't '78 1/2 also the first 80in Shovelhead?

74in juggs are different from 80in.
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post #7 of 10 (permalink) Old 09-16-2011, 02:11 PM
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Quote:
Originally Posted by pb68slab View Post
Wasn't '78 1/2 also the first 80in Shovelhead?

74in juggs are different from 80in.
74" jugs: 10 fins

80" jugs: 9 fins

However, I thought they didn't come out with the 80" until 82-83.

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post #8 of 10 (permalink) Old 09-16-2011, 05:17 PM
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My late bro had a 1979 FLH and it was definately an 80in. Looking at a set of 1980 80in jugs , and they have a -78 casting number.
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post #9 of 10 (permalink) Old 09-16-2011, 06:24 PM
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Good enuf fo me Keith!

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post #10 of 10 (permalink) Old 09-16-2011, 06:37 PM
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Quote:
Originally Posted by Dave63 View Post
In 1978, the FXS had points ignition. In 1978 1/2, they changed over to electronic ignition.
That's right I had one for years 78 1/2

H.D. and me all the way
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