883 vs 1200 spark module?
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Tourer
Joined: Feb 2012
Posts: 347
Likes: 2
From: South Central PA
883 vs 1200 spark module?
I have a 2003 XLH 883 converted to 1200. I have had a hard time getting rid of decel pop and I get a valve rattle from time to time taking of from a stop. Is there a difference in the 883 and 1200 spark module? I used the 883 heads with Weisco pistons/rings. My jets are 45 and 180. Air filter is round 6" high flow with Kraft high flow exhaust.
Road Captain
Joined: Jun 2012
Posts: 533
Likes: 2
From: Virginia
There is a difference in the ignition modules - primarily, the 883 has a more agressive advance curve, and a 6K rev limit, where the stock 1200 module of that era has a 5500?? (might be 5200) RPM rev limit. If you used conversion pistons during your 883-1200 conversion, and retarded the initial advance per the directions, you should be fine. If not - you've still got some work to do.
Club Member
Joined: Feb 2007
Posts: 16,320
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From: Boynton Beach, FloriDuh
If your now 1200 has 9.5:1 compression, it is going to have a tendency to want to ping if the timing is still set for an 883 (20 degrees at 1000 rpm idle). If you are still running 87 octane, the first thing to do is switch to 91+ octane, then use a timing light to set your timing to about 17 or 18 degrees at 1000 rpm idle.
Road Captain
Joined: Jun 2012
Posts: 533
Likes: 2
From: Virginia
What cHarley said - you can "estimate" that amount of retard by turning the module counter-clockwise (to the left as you sit facing the cam cover) about 3/8".
If you still have pinging issues - I'd suggest that cams (increased overlap to bleed off a little low-rpm cylinder pressure) and an aftermarket ignition should be your next purchase ( I like the Daytona Twin Tec, and the Ultima units).
The Andrews N4s are a real decent street cam, as are the SE .535s
If you still have pinging issues - I'd suggest that cams (increased overlap to bleed off a little low-rpm cylinder pressure) and an aftermarket ignition should be your next purchase ( I like the Daytona Twin Tec, and the Ultima units).
The Andrews N4s are a real decent street cam, as are the SE .535s
Thread Starter
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Tourer
Joined: Feb 2012
Posts: 347
Likes: 2
From: South Central PA
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Road Captain
Joined: Jun 2012
Posts: 533
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From: Virginia
Order a tach? I can understand wanting one, but, just wanted to make sure that you didn't misunderstand the advice: A tach isn't necessary to do this initial timing adjustment.
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