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post #1 of 23 (permalink) Old 06-15-2019, 04:51 PM Thread Starter
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Default Lower Idle

Once warmed up my bike used to idle at a steady 950 RPM. Since I changed the oil using Victory 20W40 blend, put a new K&N Air filter in and changed the spark plugs to NKG Iridiums it now idles around 850 RPM. I don’t understand how a simple tune up could lower the RPM’s like this.
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post #2 of 23 (permalink) Old 06-15-2019, 04:55 PM
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Once warmed up my bike used to idle at a steady 950 RPM. Since I changed the oil using Victory 20W40 blend, put a new K&N Air filter in and changed the spark plugs to NKG Iridiums it now idles around 850 RPM. I don’t understand how a simple tune up could lower the RPM’s like this.
It could be the engine doesn't have to work as hard with the turn up, so it idles lower....

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post #3 of 23 (permalink) Old 06-15-2019, 06:13 PM Thread Starter
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I never thought that possible.
I’m waiting for my Sumax Thundervolt 10.4mm spark plug wires to be delivered. Especially since when I went to change the spark plugs the connectors broke off the old wires and stayed on the old spark plugs! You can imagine my frustration when that happened since I hadn’t gotten the new wires yet!
Out of desperation to ride I got my needle nose pliers and reattached the broken connectors to the new spark plugs and jammed the old wires back onto them. Can you believe it actually started? I didn’t! That’s when I noticed the idle was much lower than before. Even with the poor spark plug wire connection! So of course I went for a little ride. Surprisingly it ran pretty good. At times better, other times slightly sluggish, but overall better. It’s a good thing rain is in the forecast for the next few days until the new spark plug wires are due to arrive (they aren’t available until June 21st). Otherwise I would be a little leery about the performance.
It’s amazing what one will do to ride...
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post #4 of 23 (permalink) Old 06-15-2019, 07:00 PM
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Something else is going on. Possibly something with the idle air controller. Maybe a dirty throttle body. Possibly needs a throttle position reset or it might have a vacuum leak.

What year and model is this Vic?

Last edited by BBob; 06-15-2019 at 07:03 PM.
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post #5 of 23 (permalink) Old 06-15-2019, 07:07 PM Thread Starter
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2014 Victory Hammer. Is 850 RPM too low? I bought it with 3400 miles on it from a local dealer back in April this year. It now has 5060 miles.
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post #6 of 23 (permalink) Old 06-15-2019, 07:42 PM
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2014 Victory Hammer. Is 850 RPM too low? I bought it with 3400 miles on it from a local dealer back in April this year. It now has 5060 miles.
Yeah; it's a bit low. Vic's like to idle from 950 to 1k rpm.

Okay; it won't be a dirty throttle body and the idle speed is set by the factory. I looked up the specs and...

Idle Speed / Fast Idle
Speed
Not Adjustable (Set by ECM
and IAC valve) Spec Idle
Speed is 950 rpm ± 100

So at 850 rpm it's within spec. I took this from a 2013 XC manual since I didn't have one for your model and year.

The throttle position reset is no longer needed starting with 2008 model year when they went with a closed loop system. If you do the reset with yours it will force the IAC to relearn where it should be. I don't see that as a bad thing but the expert mechanics don't recommend it.

A vacuum leak seems unlikely but one never knows. A vacuum line could have been pulled partially off while doing other stuff without you or someone else realizing it.

I guess the next move would be to wait till you install the new plug wires and maybe look around behind the cheese wedges to see if any vacuum lines look loose.
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post #7 of 23 (permalink) Old 06-15-2019, 07:52 PM Thread Starter
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Pardon my ignorance but... cheese wedges?
And thank you for your knowledge and information! Do you think the poor connections at low RPM at idle (arcing resistance) of my defective wires might be the cause of the drop of idle speed? It seems you’ve eliminated other possibilities.
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post #8 of 23 (permalink) Old 06-15-2019, 08:06 PM Thread Starter
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Or with better performance components the engine is just running more efficient?
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post #9 of 23 (permalink) Old 06-15-2019, 08:07 PM
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Pardon my ignorance but... cheese wedges?
And thank you for your knowledge and information! Do you think the poor connections at low RPM at idle (arcing resistance) of my defective wires might be the cause of the drop of idle speed? It seems you’ve eliminated other possibilities.


I guess we will find out about the wires when you replace them with the new ones.
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post #10 of 23 (permalink) Old 06-15-2019, 08:16 PM Thread Starter
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I do have Victory X bow exhaust which may mess with back pressure specs but it hasn’t been an issue in the past that I’m aware of.
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