Harley Rear Cylinder Deactivation?
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Intermediate
Joined: Feb 2007
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Harley Rear Cylinder Deactivation?
Received abrochure in the mail from Harley last night that had a pull out on keeping cool while summer riding. In it included a couple interesting things I had never seen before, which included dealer-installed software upgrade called the Engine Idle Temperature Management System (EITMS) for 2007 and 2008 Touring models.
Brochure states, "During hot idle, or when the motorcycle is off-throttle and running at hot temperatures, EITMS shuts off fuel to the engine's rear cylinder, leaving it to idle on the front cylinder only. Without combustion, the rear cylinder and exhaust header will begin to cool, bringing relief to the rider (and passenger) soon after. Once the rear cylinder cools to a predetermined temperature, or as soon as the rider accelerates, both cylinders resume operation. And by maintaining constant rpm during rear cylinder "shutdown," transitions between one and two cylinder operation are nearly seamless.
EITMS is purely for rider comfort. When it activates and "shuts off" the rear cylinder, it's not because the motor is overheating. It's designed to reduce the heat radiating from the rear cylinder to the rider.
Once an appointment is made, the EITMS software reflash can be performed for free by any H-D dealer, usually while you wait. If, for any reason, the rider does not like the EITMS, it can be returned to the previous mapping for free.
Anyone hear of this or tried the download? Sounds interesting but at the same time I wouldn't want to ride a Harley that at idle sounds like a Honda!
Brochure states, "During hot idle, or when the motorcycle is off-throttle and running at hot temperatures, EITMS shuts off fuel to the engine's rear cylinder, leaving it to idle on the front cylinder only. Without combustion, the rear cylinder and exhaust header will begin to cool, bringing relief to the rider (and passenger) soon after. Once the rear cylinder cools to a predetermined temperature, or as soon as the rider accelerates, both cylinders resume operation. And by maintaining constant rpm during rear cylinder "shutdown," transitions between one and two cylinder operation are nearly seamless.
EITMS is purely for rider comfort. When it activates and "shuts off" the rear cylinder, it's not because the motor is overheating. It's designed to reduce the heat radiating from the rear cylinder to the rider.
Once an appointment is made, the EITMS software reflash can be performed for free by any H-D dealer, usually while you wait. If, for any reason, the rider does not like the EITMS, it can be returned to the previous mapping for free.
Anyone hear of this or tried the download? Sounds interesting but at the same time I wouldn't want to ride a Harley that at idle sounds like a Honda!
Road Warrior
Joined: Jul 2006
Posts: 1,363
Likes: 1
From: New Iberia, Louisiana
RE: Harley Rear Cylinder Deactivation?
This site has some more information from an indenpendent source.
http://www.nightrider.com/biketech/hd2007HD_heat_00.htm
Of course, they are selling something and one should digest the information with that in mind but, it looks like they have explored the heat issue in detail.
http://www.nightrider.com/biketech/hd2007HD_heat_00.htm
Of course, they are selling something and one should digest the information with that in mind but, it looks like they have explored the heat issue in detail.
Stage II
Joined: Jul 2022
Posts: 2
Likes: 0
From: strathroy ont
2002 ultra limitede
My new 2022 ultra revs high and shakes noticeably when idling in neutral
as rear cylinder activation kicks in.I am told by dealer that this is normal/
Has anyone encountered this on their bike.
as rear cylinder activation kicks in.I am told by dealer that this is normal/
Has anyone encountered this on their bike.
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From: Knoxville
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Road Warrior
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george bush still had a year and a half left as president and the very first iPhone was announced the same time this thread was started. Holy hell.
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