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Lean Running Bike

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Old 09-10-2018, 09:56 AM
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Default Lean Running Bike
I've got an 07 Heritage which runs lean. That by itself is understandable, but what could cause a bike to progressively run leaner and leaner over time? I don't have any issues in the fuel tank, so that's out. For the life of me I can't figure it out..
 
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Old 09-10-2018, 11:37 AM
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How have you measured the increasing leanness?
Or what are the symptoms?
 
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Old 09-10-2018, 11:57 AM
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Haven't made any kind of measurements, but it's decible popping and gurgling. That in itself is a little normal, but it's getting worse and worse and has even now started popping between shifts. It used to not do any of that.
 
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Old 09-10-2018, 12:14 PM
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Are you sure it’s leaner and not richer? How long since you changed the air filter?
 
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Old 09-10-2018, 12:26 PM
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I don't think richer would cause the popping. That's a symptom of a lean condition. The air filter was replaced just a couple of months ago..
 
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Old 09-10-2018, 02:39 PM
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Possible air leak at the intake manifold or exhaust header.
 
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Old 09-10-2018, 05:07 PM
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Originally Posted by txfxstrider
Possible air leak at the intake manifold or exhaust header.
This sounds like a possibility to me.
 
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Old 09-10-2018, 06:34 PM
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Originally Posted by Pitbull_Dallas
I don't think richer would cause the popping. That's a symptom of a lean condition. The air filter was replaced just a couple of months ago..
Too rich can cause it too. Unburned fuel igniting inside the exhaust. Or, as others have mentioned, en exhaust leak can definitely cause it.
 
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Old 09-10-2018, 07:50 PM
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My bike was doing the same thing a few months ago. I changed intake seals, changed and reseated exhaust several times. No luck. Bike was popping at first and got progressively worse - coughing, sputtering and stalling sometimes when hot and coming to stop. I went thru bike, checked all wiring, replaced several things. Again, no luck until I got a bad intake air temp sensor code l, replaced it, and all problems went away. Bike has run great since then. Are you getting any codes?
 
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Old 09-11-2018, 09:52 AM
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Originally Posted by txphatboy
My bike was doing the same thing a few months ago. I changed intake seals, changed and reseated exhaust several times. No luck. Bike was popping at first and got progressively worse - coughing, sputtering and stalling sometimes when hot and coming to stop. I went thru bike, checked all wiring, replaced several things. Again, no luck until I got a bad intake air temp sensor code l, replaced it, and all problems went away. Bike has run great since then. Are you getting any codes?
I haven't gotten any codes at this point. As long as this has been going on and getting progressively worse, I'd expect a code, but nada..

Do you mean air intake sensor or head temp sensor? I replaced the head temp sensor and there was no change.
 
Last edited by Pitbull_Dallas; 09-11-2018 at 09:53 AM.
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