Idle - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 29 (permalink) Old 07-17-2019, 09:25 AM Thread Starter
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Idle

I'm curious on how you fine people set your idle correctly (950rpm - 1050rpm). I cleaned and synced my carbs, readjusted the idle by ear, but am unsure if it's actually set to the correct spec. I bought a cheap digital RPM gauge for 10 dollars off ebay but I'm pretty sure it's inaccurate (shows my idle as being excessively higher than what it is).

How do the dealerships do it and I'm wondering if they would quickly adjust it for me if I dropped in.

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post #2 of 29 (permalink) Old 07-17-2019, 09:50 AM
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The idle does sound high but that's the way the Vstar is made. A lot of people want to idle down the get that "Harley sound", but very bad for our bikes. A low idle does not build enough oil pressure to keep things properly lubricated. The Vstar is a duel fire ignition, meaning it fires twice per stroke. This helps with emissions to burn any fuel left in cylinder. Most tachometers are set up for single fire ignition. Your tach is reading twice the true RPM. So if tach shows 2000 it's actually 1000. Hope all that made sense.

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post #3 of 29 (permalink) Old 07-17-2019, 10:07 AM Thread Starter
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Originally Posted by lesblank View Post
The idle does sound high but that's the way the Vstar is made. A lot of people want to idle down the get that "Harley sound", but very bad for our bikes. A low idle does not build enough oil pressure to keep things properly lubricated. The Vstar is a duel fire ignition, meaning it fires twice per stroke. This helps with emissions to burn any fuel left in cylinder. Most tachometers are set up for single fire ignition. Your tach is reading twice the true RPM. So if tach shows 2000 it's actually 1000. Hope all that made sense.
Thank you. But if my digital tach is set on single fire ignition, but my bike is duel fire ignition, then if the tach is showing 2000rpm, wouldn't the bike actually be 4000rpm? (note: bike is NOT set to those specs. Just using to follow example)

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post #4 of 29 (permalink) Old 07-17-2019, 10:20 AM
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A tach set to single fire ignition will display ignition fires and converts to RPM. So if tach picks up one fire per revolution in a minute then RPM would be 1. On our bikes the ignition fires twice every revolution so it would show 2 RPM even though it was only 1 cycle of the ignition stoke. I'm sure I'm not explaining this very good, it's in my brain, just can't put it in words very well. 😀
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2001 Vstar 1100 Classic (sold), Cobra Slash Cut full exhaust, Dropped 1 inch with lowering links, ORK, 4.5 inch handlebar risers, Ultimate passenger seat, Passenger pegs moved forward 4 inches, Handlebar clock, KN air filter, Viking saddlebags, Additional rear lighting
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https://sites.google.com/site/vstar1100kb/home
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post #5 of 29 (permalink) Old 07-17-2019, 10:26 AM
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A tach set to single fire ignition will display ignition fires and converts to RPM. So if tach picks up one fire per revolution in a minute then RPM would be 1. On our bikes the ignition fires twice every revolution so it would show 2 RPM even though it was only 1 cycle of the ignition stoke. I'm sure I'm not explaining this very good, it's in my brain, just can't put it in words very well. 😀
I believe what you are trying to say if it read 4000 rpms because it fires twice per stroke it would actually be 2000rpm. Divide by 2 because it fires twice per stroke.
Rpms sound pretty high by ear. Need to be higher than you think
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post #6 of 29 (permalink) Old 07-17-2019, 10:32 AM Thread Starter
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Okay I believe my tach has the option to set it to "the spark plug fires two times per revolution", which is the option we want right? Whatever it displays will be the true rpm right?

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post #7 of 29 (permalink) Old 07-17-2019, 10:43 AM
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Okay I believe my tach has the option to set it to "the spark plug fires two times per revolution", which is the option we want right? Whatever it displays will be the true rpm right?
I believe you are correct. Make sure the bike is warm.

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post #8 of 29 (permalink) Old 07-17-2019, 12:34 PM Thread Starter
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Okay so here's my results. I set my digital meter to "fires once per revolution" because the meter wraps around 1 spark plug wire, therefore only reads the reading from 1 spark plug, which fires once per revolution. I stopped raising my idle at "840 - 900" rpm on the meter, because i feel like my idle is pretty high from the sound of it. Please watch the video i just created to let me know if the idle sounds about right to you or if it sounds too high or too low please. Keep in mind I'm going off sound because meters can be faulty.


Thank you.
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post #9 of 29 (permalink) Old 07-17-2019, 12:52 PM
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Sounds like a sewing machine as many have compared it to. Was the engine fully warm. I would still go up just a tad too get closer to the 950 rpm mark. Yes it sounds high, but it's correct to maintain proper idle oil pressure.
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2001 Vstar 1100 Classic (sold), Cobra Slash Cut full exhaust, Dropped 1 inch with lowering links, ORK, 4.5 inch handlebar risers, Ultimate passenger seat, Passenger pegs moved forward 4 inches, Handlebar clock, KN air filter, Viking saddlebags, Additional rear lighting
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post #10 of 29 (permalink) Old 07-17-2019, 01:00 PM Thread Starter
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Sounds like a sewing machine as many have compared it to. Was the engine fully warm. I would still go up just a tad too get closer to the 950 rpm mark. Yes it sounds high, but it's correct to maintain proper idle oil pressure.
Engine was fully warm. 25 minutes on the hwy straight to home.

Okay was just checking to make sure the high-sounding idle sounded normal to you's since I don't have another vstar to compare it to lol

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