how low can idle safely be set? - Road Glide Forums
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post #1 of 9 (permalink) Old 03-15-2016, 09:55 AM Thread Starter
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how low can idle safely be set?

Just wondering how low the idle on these newer bikes can safely be set without causing oiling / pressure issues? Mines is set at 980 right now which my tuner stated was the lowest harley recommend but I sure like the way may 95CI sounded at 800-850 rpms... it had 50k on it when I sold it and I'd never had any issues with it. My tuner told me he'd put it lower if I'd like but I held off until I did some research

2013 FLTRX, stage 1 w/vance and hine power duals and rinehart slipons, TTS mastertune and some other odds and ins. Long ways to go
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post #2 of 9 (permalink) Old 03-15-2016, 11:23 AM
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With EFI , I think it's recommended to be around 1050 or so ..

Not a carb anymore so no more potatoes sadly

So Many Highways So Little Time
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post #3 of 9 (permalink) Old 03-15-2016, 12:14 PM
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Factory sets the idle at 1050, I turned my idle down to 975 and it seems OK I tried lower idle but it seemed a little to rough. Not only is it best to have the idle a little high because it oils the top end better but it is also better for the electrical system, with the bikes having more lights and electronics the higher idle will keep the battery charged.
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post #4 of 9 (permalink) Old 03-15-2016, 09:35 PM
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There was an extended discussion about this on HTT a few years ago. IIRC, the lowest you can safely go is 900rpm due to oil pressure. But the question that came up was "why?" Mine's set at 1000rpm, as the map came from Fuel Moto. Can't imagine wanting it any lower.

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post #5 of 9 (permalink) Old 03-15-2016, 11:53 PM
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I keep all of mine set to 1050. Better safe than sorry.

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post #6 of 9 (permalink) Old 03-16-2016, 07:15 AM
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A "comfortable" idle can vary from engine to engine, but for the most past, right around 1000 rpms.
FWIW, our AHDRA Modified Class bike idled "comfortably" at 2200 rpms.
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post #7 of 9 (permalink) Old 03-16-2016, 11:09 AM Thread Starter
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Guess it will be staying at 980 then....
thanks

2013 FLTRX, stage 1 w/vance and hine power duals and rinehart slipons, TTS mastertune and some other odds and ins. Long ways to go
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post #8 of 9 (permalink) Old 03-20-2016, 09:18 AM
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From Harley Davidson:
"To ensure proper charging at idle, maintain an idle
speed of approximately 950-1050 RPM. Insufficient idle
speed may drain the battery in excessive idle situations,
resulting in insufficient voltage to the ECM, ignition coil
and fuel pump (which can result in a variety of operating problems"

If one wants a lopey sound, put a lopey cam in the damn thing.
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post #9 of 9 (permalink) Old 03-21-2016, 06:53 AM
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Odd that HD did not mention anthing in regards to oil pressure, or lack proper oil pressure at an idle that is too low of an rpm........which would be a LARGE concern of mine.
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