1989 FLHS engine swap
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Cruiser
Joined: Aug 2011
Posts: 159
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From: Upper Bucks County, PA
1989 FLHS engine swap
Having issues with my Evo and am tired of "chasing my tale". I got an opportunity on a Revtech 100" or an S&S 80" both are same price, but S&S doesn't come with electronics or carb.
My question is will my '89 be able to deal with the added horse and torque of the 100"?
Thanks in advance
My question is will my '89 be able to deal with the added horse and torque of the 100"?
Thanks in advance
Club Member
Joined: Jun 2007
Posts: 45,429
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From: Bedford UK
I've got an S&S 107" in my 1990 FLHS, with 100+ HP/TQ! In essence, yes your bike will cope just fine. I replaced all the engine rubber mounts and added a beefier clutch spring (Barnett), also replaced the compensator and primary chain (the teeth had gone sharp, ie worn). An S&S 96" or 111" can be had with carb and electronics, plus up to 3 years warranty, as mine did. No I didn't need it (engine new in 2008).
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
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From: la la land jerzey
we could use a evo core in the shop i would be interested in buying the old motor and dont care what the issue is - PM me when you replace it your only about an hour from me in jersey - johnjzjz
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Cruiser
Joined: Aug 2011
Posts: 159
Likes: 3
From: Upper Bucks County, PA
I've got an S&S 107" in my 1990 FLHS, with 100+ HP/TQ! In essence, yes your bike will cope just fine. I replaced all the engine rubber mounts and added a beefier clutch spring (Barnett), also replaced the compensator and primary chain (the teeth had gone sharp, ie worn). An S&S 96" or 111" can be had with carb and electronics, plus up to 3 years warranty, as mine did. No I didn't need it (engine new in 2008).
Advanced
Joined: Jan 2008
Posts: 84
Likes: 3
From: Cleveland, Ohio
Put a S&S 124 in my 1989 FLHTC. In my case I updated the clutch to a Bandit and switched to chain final drive. No problems with frame, suspension, etc.
You may have to run a heaver clutch spring as grbrown noted.
You may have to run a heaver clutch spring as grbrown noted.
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Stellar HDF Member
Joined: Oct 2005
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89 cases had some problems, especially the race facing the primary had a tendency to walk in some of them and caused the oil to get sucked into the primary, no sense building that block ( as an owner of an 89 , I hated that weakness).
IMHO - I'd take the S&S over the Revtech any day and twice on sunday. The search engine is your friend, see how many issues rev techs have had over the years. The S&S product line is light years ahead in quality, parts availabilty and service.
IMHO - I'd take the S&S over the Revtech any day and twice on sunday. The search engine is your friend, see how many issues rev techs have had over the years. The S&S product line is light years ahead in quality, parts availabilty and service.
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