swap EVO 1991 flhtc engine into 1986 softtail custom
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Stage I
Joined: Oct 2017
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From: Ottawa Canada
swap EVO 1991 flhtc engine into 1986 softtail custom
Hi,
I have an EVO out of a 1991 FLHTC and wondering what would need to be modified to drop it into a 1986 softtail custom.
Someone mentioned that the inner and out primary need to be changed?
I have an EVO out of a 1991 FLHTC and wondering what would need to be modified to drop it into a 1986 softtail custom.
Someone mentioned that the inner and out primary need to be changed?
Tourer
Joined: Apr 2017
Posts: 303
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From: New Galilee, Pa
Correct, flh has a short primary, softail has a long primary. The oil routing system is different also I believe. Not sure if the transmission plates are different, I would assume so since they are positioned diffently.
With that being said, if you have an 86 softail with say a blown motor and everything else is good, it should all bolt up. In 86, the motor was definitely a bottom breather, not sure about the 91. Other than the possible breather, the block itself is the same, just everything else that is different. As far as I know the motor mounts are the same, should be 2 in front, 2 in back, and the mount up top.
With that being said, if you have an 86 softail with say a blown motor and everything else is good, it should all bolt up. In 86, the motor was definitely a bottom breather, not sure about the 91. Other than the possible breather, the block itself is the same, just everything else that is different. As far as I know the motor mounts are the same, should be 2 in front, 2 in back, and the mount up top.
Seasoned HDF Member
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From: Upstate New York
91 was still a bottom breather. Motor should bolt right in, but not the primary or transmission. The rubber mounted drivetrain was different. The primary was shorter and the transmission case carried the swingarm on the touring bikes.
My bagger has the oil filter down under the swingarm. Softails have the bracket on the front of the engine.
Can a bagger motor accept that bracket? I've never looked, but I don't think my right case has the mounting holes that would be required.
Dirt don't hurt
Joined: Jan 2011
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From: Haslet Texas
If that's the case can't he just unbolt the blown motor and bolt in the bagger motor?
Seasoned HDF Member
Joined: May 2008
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From: South Carolina
The oil filter mount on the early Softails is on the front downtube (the best setup the factory ever used).
Engine is a direct swap.
Engine is a direct swap.
Last edited by Dan89FLSTC; Oct 7, 2017 at 07:49 AM.
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Joined: May 2008
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From: South Carolina
I think the mounting boss welded to the frame downtube may have started when they started making a Softail model with footboards.
Last edited by Dan89FLSTC; Oct 7, 2017 at 08:00 PM.
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