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Sportster Motorcycle General Discussion and Problems For discussing problems about your Sportster motorcycle that don't fit anywhere else.

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  #6051  
Old 2 Days Ago
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60Gunner 60Gunner is offline
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You can't tune the carb with the pump nozzle. In fact, it's easier to tune taking it out of the equation. The pump is to bring on more fuel when you get on it. 1/4-3/4 throttle. It should be rich doing this.
Also what AFR gauge are you trying to tune with? I just did the very same thing and you need to use a good wideband and I stress the word "good".
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Last edited by 60Gunner; 2 Days Ago at 13:46..
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  #6052  
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sml1226 sml1226 is offline
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Not sure why you couldn’t tune an adjustable pump stroke with multiple nozzle sizes. Sort of seems like that’s the reason for those things to be there...

You don’t think making an adjustment to something that affects fueling is tuning? I was adjusting for a lean condition while accelerating hard during the pump stroke. Given that it put out good numbers at steady throttle in the same range, it is definitely a pump controlled issue.

And Bone, yes, aftermarket gauge using a sensor in an aftermarket pipe with bungs already there, purely for the sake of a tuning aid. Seeing as the bike doesn’t use the output for anything itself, it just slowly drives you crazy as it bounces around every time anything changes in the air. Should be pretty close now, so I’m just going to ride it without the gauge. Should be more enjoyable that way. I just sort of took a stab at explaining what I’d done to clarify. Hard to figure out what part confused you with just “?!?” after all
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Quote:
Originally Posted by sml1226 View Post
Hard to figure out what part confused you with just “?!?” after all
Fair point
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