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  #1  
Old 26th December 2013
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Default Does the ECM have an adjustment screw?

My friends EFI Sportster has a small square flap on the front side of the ECM and under that is a screw marked "A" and "R". Anyone know what that adjustment controls? Our local discussion is that small adj there can help with low speed jerky issues...
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  #2  
Old 26th December 2013
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So, asking about your "friends" bike? Heard that one before.

As to your "friends" questions:

Advance and Retard, perhaps? Static timing adjustment? That is probably not the problem.

Low speed jerky issues. That is most commonly referred to as PILOT ERROR. Learn how to engage throttle and clutch as a symphony of synchronicity and simplicity. Don't lug your Sportster!

John
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Old 26th December 2013
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Ive never heard of a screw being used to adjust an ECM.....but if there were such a thing, Harley would surely be the one to try it...
As far as the jerky issue..that's easily solved with a quality tuner such as the Power Vision
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  #4  
Old 26th December 2013
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Quote:
Originally Posted by Crosshairs View Post
Ive never heard of a screw being used to adjust an ECM.....but if there were such a thing, Harley would surely be the one to try it...
As far as the jerky issue..that's easily solved with a quality tuner such as the Power Vision
Some early non-feedback Webber-Marelli EFI systems (specifically found on some Guzzi California models) used an ECM that contained a screw that could be used to fatten or lean the mixture slightly.

Never heard of it on a Harley, though early EVO EFI WAS Webber-Marelli so it's possible.
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Old 26th December 2013
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I love this forum oh so much and long time GI.
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Old 26th December 2013
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Old 26th December 2013
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Thanks for the input. I have one friend who has done this and I see the cover plate in the manual. The manual doesn't label it and my friend with running issues hasn't looked at his yet. He can get it checked out with a tuner though.
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  #8  
Old 29th December 2013
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Your low speed jerky issues are 80% mixture, and 20% behavior. Richening things up will make you a lot happier!
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