Heat issue
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Intermediate
Joined: Jun 2018
Posts: 33
Likes: 3
From: Grand Rapids Mi
Heat issue
On my 97 ultra classic efi 1 cylinder runs 135 and the rear is at 212. Any suggestions on why they would be reading different temps? Any help would be appreciated.
Stellar HDF Member
Joined: Sep 2016
Posts: 2,908
Likes: 3,512
From: At home.
Because the one in the one in the rear gets less air flow, perhaps.
Thread Starter
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Intermediate
Joined: Jun 2018
Posts: 33
Likes: 3
From: Grand Rapids Mi
It's Fuel injected and when I start the bike and let it run for a minute then I checked the temperature at both exhaust pipes at the heads and the rear read 212 and the front read 135.
Last edited by Jers420; Oct 7, 2019 at 05:37 PM. Reason: Add more
Seasoned HDF Member
Joined: Sep 2008
Posts: 14,210
Likes: 11,337
From: San Diego, CA
Hmmm...
Any recent mods, repairs....?
Did it just start doing this or has it been like this for awhile?
How does the bike run? Any recent changes in the way the bike runs...?
Seems a large difference in temp for a short period of just sitting still, no movement..... Possible issues with: poor tune, intake leak, dirty injector...
Those are the first possibilities to pop into my mind..
Of course, you are talking about an EVO engine with the MM injection... I know the MM FI has its own foibles... but I am not well versed on the MM system..
Any recent mods, repairs....?
Did it just start doing this or has it been like this for awhile?
How does the bike run? Any recent changes in the way the bike runs...?
Seems a large difference in temp for a short period of just sitting still, no movement..... Possible issues with: poor tune, intake leak, dirty injector...
Those are the first possibilities to pop into my mind..
Of course, you are talking about an EVO engine with the MM injection... I know the MM FI has its own foibles... but I am not well versed on the MM system..
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Seasoned HDF Member
Joined: Sep 2009
Posts: 17,149
Likes: 6,174
From: SE Michigan
Almost certainly normal. As previously stated rear is always hotter.
Stop measuring things, and ride.
Stop measuring things, and ride.
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Thread Starter
|
Intermediate
Joined: Jun 2018
Posts: 33
Likes: 3
From: Grand Rapids Mi
Hmmm...
Any recent mods, repairs....?
Did it just start doing this or has it been like this for awhile?
How does the bike run? Any recent changes in the way the bike runs...?
Seems a large difference in temp for a short period of just sitting still, no movement..... Possible issues with: poor tune, intake leak, dirty injector...
Those are the first possibilities to pop into my mind..
Of course, you are talking about an EVO engine with the MM injection... I know the MM FI has its own foibles... but I am not well versed on the MM system..
Any recent mods, repairs....?
Did it just start doing this or has it been like this for awhile?
How does the bike run? Any recent changes in the way the bike runs...?
Seems a large difference in temp for a short period of just sitting still, no movement..... Possible issues with: poor tune, intake leak, dirty injector...
Those are the first possibilities to pop into my mind..
Of course, you are talking about an EVO engine with the MM injection... I know the MM FI has its own foibles... but I am not well versed on the MM system..
Last edited by Jers420; Oct 7, 2019 at 09:01 PM. Reason: Add more
Stellar HDF Member
Joined: Feb 2007
Posts: 2,558
Likes: 280
From: Russellville, Arkansas
My 1998 Ultra....
Others have mentioned rear cylinder is always hotter.....so true.
Anyways....mine had a pop on deceleration too. Ended up being a cracked Y-Pipe off the rear cylinder. It’s not uncommon to find a cracked one from that era.
Others have mentioned rear cylinder is always hotter.....so true.
Anyways....mine had a pop on deceleration too. Ended up being a cracked Y-Pipe off the rear cylinder. It’s not uncommon to find a cracked one from that era.