New Slip on not getting hot
Road Warrior
Joined: Jan 2012
Posts: 1,392
Likes: 21
From: Delaware
I don't know how many people here can tell you their left pipe always stays cold on that system before you believe it though. Look inside your old mufflers if you have them- see the right pipe has carbon buildup and the left one is pretty clean. You can also just start your bike, walk around back, and put your hand behind the mufflers and feel the right muffler pumping air out and the left side pushing almost nothing.
Last edited by Loc_Tite; Oct 30, 2016 at 05:42 AM.
Thread Starter
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Intermediate
Joined: Aug 2015
Posts: 32
Likes: 0
From: Arkansas
I wasn't pointing fingers at anyone. Just frustrated. I forgot to mention that I changed plugs when I first noticed the cool air. The rear plug looks like it's seen very little action. Since I did get a p0113 code (open/high IAT sensor), would the sensor shut the rear cylinder down or would another issue within the wiring or cylinder cause the p0113 code? Naturally, my biggest concern is "have I damaged my rear cylinder"?? Thanks for any feedback.
Thread Starter
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Intermediate
Joined: Aug 2015
Posts: 32
Likes: 0
From: Arkansas
As far as cold air, this is the 4th set of exhausts I've had on this bike. I've had BUBs, Krome Werks, Stock and these - full boar. Every one of the left exhaust on ALL of the other part got HOT. I understand the left is not going to get as hot as the right, but after 700 miles the left exhaust has no sign of carbon or soot. It looks like it came out right out of the box new. My right pipe has a little bluing already, where it attaches to the head pipe. It's obvious from my previous post my rear cylinder is not firing or at least not firing all of the time, based on the spark plug. I've ridden bikes all my life but I am a pathologist and know very little about "wrenching". I'm trying to learn, thus the reason I'm on this forum. Can I move the front cylinder's spark plug wire to the rear cylinder and rear cylinder wire to the front cylinder and start the bike without harming anything?? Probably a simple answer, but as stated, I'm trying to learn. Thanks for any advise.
Road Warrior
Joined: Nov 2007
Posts: 1,428
Likes: 71
From: Belleville Mi.
Seems like you have some kind of blockage at the y pipe not letting exhaust gasses down the left side. Have you tried putting the old slip ons back on to see if it still happens? Just a thought, hope you get it figured out and post what you found out....
Trucky911
Trucky911
Seasoned HDF Member
Joined: Jan 2006
Posts: 11,476
Likes: 3,004
From: Charleston, SC
No, you cannot swap wires and hope it will run. It won't.
But... what you can do is pull the front plug wire and ground it. Then start the bike.
It will run on one cylinder (the rear one), will sound strange but you'll then verify that your rear cylinder is fine. Check exhaust from there.
You'll probably find that 90% of the rear cylinder exhaust will go out the right muffler...
But... what you can do is pull the front plug wire and ground it. Then start the bike.
It will run on one cylinder (the rear one), will sound strange but you'll then verify that your rear cylinder is fine. Check exhaust from there.
You'll probably find that 90% of the rear cylinder exhaust will go out the right muffler...
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,940
Likes: 8,037
From: poway
The only way to fix this is install a 124 ci SnS motor.. Then the left side will get hotter but still not as hot as the right..
Thread Starter
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Intermediate
Joined: Aug 2015
Posts: 32
Likes: 0
From: Arkansas
Spoke with a Harley Master Tech (22 years experience). Quote from him; " cold air is an clear indication the rear cylinder is not firing as it should and something is not working properly. Yes, with your bike, the left side will not be nearly as hot as right side but since the pipe is clean and no carbon of any sort and since it threw a p0113 code, either the air intake sensor is bad or you have a wire that has come loose". Then he asked me if I've seen one single cross over system like mine where the left slip on didn't have ANY carbon or soot? NOPE. "Has the left pipe always been hot with the other slip ons". YEP "Rear cylinder plug looks practically new (not black, not grey, not brown tinted). Then he said,, "you have a problem". Am taking to shop on Tuesday when they open. I will post the outcome. Thanks for everyone's help and advice. I will just have to bite the bullet and pay THE MAN.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,940
Likes: 8,037
From: poway
Definitely a good idea taking it to shop where someone is familiar with HDs.. Since you changed pipes it probably needs to be retuned.
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Joe Kucinski
Seasoned HDF Member
Joined: Sep 2005
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From: Prescott, AZ
been reading this post and today I went for a ride - now I may be comparing apples to oranges because mine is a 15 - However, with left forward shield off - pipe was too hot to continue to hold after about 60 seconds....
did you ever find anything on yours?
did you ever find anything on yours?
Outstanding HDF Member
Joined: Nov 2008
Posts: 2,034
Likes: 128
Spoke with a Harley Master Tech (22 years experience). Quote from him; " cold air is an clear indication the rear cylinder is not firing as it should and something is not working properly. Yes, with your bike, the left side will not be nearly as hot as right side but since the pipe is clean and no carbon of any sort and since it threw a p0113 code, either the air intake sensor is bad or you have a wire that has come loose". Then he asked me if I've seen one single cross over system like mine where the left slip on didn't have ANY carbon or soot? NOPE. "Has the left pipe always been hot with the other slip ons". YEP "Rear cylinder plug looks practically new (not black, not grey, not brown tinted). Then he said,, "you have a problem". Am taking to shop on Tuesday when they open. I will post the outcome. Thanks for everyone's help and advice. I will just have to bite the bullet and pay THE MAN.