vacuum cap missing?
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Road Warrior
Joined: Dec 2012
Posts: 1,335
Likes: 5
From: CT
vacuum cap missing?
Bike has suddenly been missing/skipping at light throttle. I noticed a vacuum nipple exposed under the gas tank basically on top of throttle body. I plugged it and bike idles well. Too late for a test ride.
I'm assuming it should be capped.. Right?
I'm assuming it should be capped.. Right?
Thread Starter
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Road Warrior
Joined: Dec 2012
Posts: 1,335
Likes: 5
From: CT
Thanks. I do recall a similar thread but my search came up with a bunch of threads that were not pertinent.
Elite HDF Member
Joined: Oct 2010
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From: DOWN SOUTH
I seen a thread on this before I left Afghanistan, a fellow rider could not for the life of him figure out why his bike would not run right, he was talking to an old rider one day, the guy said " did you check the vaccum cap on top of your intake?" Sure enough that was the problem...
Road Warrior
Joined: Apr 2010
Posts: 1,648
Likes: 37
From: Monroe, Louisiana
If your bike ever backfires through the intake it will/can blow this cap off. It is a tight fit, so I doubt they are just falling off. I have suspected some getting pulled off as prank. It happens more than you may think.
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Road Warrior
Joined: Dec 2012
Posts: 1,335
Likes: 5
From: CT
Update: put vacuum cap back on. Loaded back my FM base map for my tw555s. Bike ran great today. Drove to work. Home for lunch. Back to work. Fine. Came home tonight and back to missing. Skipping. Bad raw gas smell at idle and when I shut it off. Perplexed. Any ideas? 2012 rkc. Did cams two weeks ago and bike ran great until yesterday.
Last edited by 12hdrk; Oct 16, 2013 at 07:42 PM.
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Road Warrior
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Road Warrior
Joined: Apr 2010
Posts: 1,648
Likes: 37
From: Monroe, Louisiana
Not sure if this will fix it, but here is the map we are running on 2012 Limited with the same setup as you have TW555, V&H power duals, 4 in Jack pot, SEAC, and power vision. The idle when you put cams in due to low vacuum/ reversion will idle at 50% load to 100% load which is much different than stock which idles at 20 to 30. Try it you don't have anything to lose. It will definitely improve the performance. The timing is the main difference. If it idles rich with this one something else is wrong. Let me know how it works.
Make sure you always delete the learned values when you install a new map or changed map when it asks.
Make sure you always delete the learned values when you install a new map or changed map when it asks.
Last edited by ke5rbd; Oct 16, 2013 at 08:41 PM.
Thread Starter
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Road Warrior
Joined: Dec 2012
Posts: 1,335
Likes: 5
From: CT
Not sure if this will fix it, but here is the map we are running on 2012 Limited with the same setup as you have TW555, V&H power duals, 4 in Jack pot, SEAC, and power vision. The idle when you put cams in due to low vacuum/ reversion will idle at 50% load to 100% load which is much different than stock which idles at 20 to 30. Try it you don't have anything to lose. It will definitely improve the performance. The timing is the main difference. If it idles rich with this one something else is wrong. Let me know how it works.
Make sure you always delete the learned values when you install a new map or changed map when it asks.
Make sure you always delete the learned values when you install a new map or changed map when it asks.