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  #41  
Old 23rd October 2019
csmith72's Avatar
csmith72 csmith72 is offline
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warming up about (with choke)1100RPM, after warm 950(no choke). mine no longer stock though.... no stalling or diesel issues and runs like a champ.
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  #42  
Old 15th November 2019
jkinkade jkinkade is offline
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when I first start mine, I hold the speed over 1,000 till motor I warm, then ride off, I do more riding on open road, so not much idling. I know when idle is right, if I stop turn motor off, maybe a visit or a coffee of gas stop. when I come back and turn ing on, if idle speed right, one touch of button & she fires up quick, on tach looks like about 950.
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  #43  
Old 15th November 2019
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Quote:
Originally Posted by Hippysmack View Post
700-900 is in the older ironhead manuals.
Yet they warn of not going too low for fear of starving bearings.

edit:
Recommended idle speed per the -78 FSM is 700-900 RPM.
However, below 900 is not suggested by most owners. Some have had bearing failure with lower idle settings.
The -85 up to the -90 FSMs raised the idle requirement to 900-950 RPM.
So the MoCo can live and learn, we should also.
There have been many arguments pertaining to the need for the engine to have a slow Potato, Potato sound “or it ain't a Harley”.
Well a Sportster is a Harley, make that a high revving Harley (unlike the slower revving BTs), and a Sportster is not meant to be idled that low.
Forget about the peer pressure or berating of the higher RPM and tune your Sportster for performance and longevity as it was meant to be.
+1 I agree 100%
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  #44  
Old 15th November 2019
jkinkade jkinkade is offline
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Quote:
Originally Posted by Hippysmack View Post
700-900 is in the older ironhead manuals.
Yet they warn of not going too low for fear of starving bearings.

edit:
Recommended idle speed per the -78 FSM is 700-900 RPM.
However, below 900 is not suggested by most owners. Some have had bearing failure with lower idle settings.
The -85 up to the -90 FSMs raised the idle requirement to 900-950 RPM.
So the MoCo can live and learn, we should also.
There have been many arguments pertaining to the need for the engine to have a slow Potato, Potato sound “or it ain't a Harley”.
Well a Sportster is a Harley, make that a high revving Harley (unlike the slower revving BTs), and a Sportster is not meant to be idled that low.
Forget about the peer pressure or berating of the higher RPM and tune your Sportster for performance and longevity as it was meant to be.
I agree, just since I have my 03 74, turned into an 88, people say that sounds like a big twin. still stock flywheels & stroke .
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  #45  
Old 22nd November 2019
night-train night-train is offline
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Set the idle too low on a BT or a Sporty and you will be rebuilding the bottom end. Usually not a oil starvation issue but from the conn rods hammering the conn rod bearings. It causes them to oval out and then the fun starts.

Sporty idels at 1000 to 1100
evo and older Big twin around 950
TC and up around 1000 to 1100

If you like the slow lumpity lump sound and own your bike long enough you'll see the wi$dom in what I'm saying.
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  #46  
Old 26th November 2019
jkinkade jkinkade is offline
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Quote:
Originally Posted by night-train View Post
Set the idle too low on a BT or a Sporty and you will be rebuilding the bottom end. Usually not a oil starvation issue but from the conn rods hammering the conn rod bearings. It causes them to oval out and then the fun starts.

Sporty idels at 1000 to 1100
evo and older Big twin around 950
TC and up around 1000 to 1100

If you like the slow lumpity lump sound and own your bike long enough you'll see the wi$dom in what I'm saying.
I checked idle just because of this thread, was 900 cold 1,100 hot but, I'm not in traffic much so bike not idling. more important not to load up ( ride low rev in top gear ) as that does more damage to bottom end.
but don't loose sleep.
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