131 Stage 4, why not for FXFBS?
Thread Starter
|
Grand HDF Member
Joined: Nov 2017
Posts: 4,251
Likes: 3,134
From: Texas
131 Stage 4, why not for FXFBS?
I see that Harley has released the 131" engine kit for the 114" 2018+ Softails but, in the fitment notes, it says it won't fit the FXFBS Fat Bob 114.
https://www.harley-davidson.com/us/en/shop/screamin-eagle-milwaukee-eight-engine-stage-iv-kit-114ci-to-131ci/p/92500095
It contradicts itself, if you search the site for parts for the FXFBS it does bring up this kit, and says it will fit, but then in the "details" tab it specifically says it won't fit.
So... Why? A q&a says it won't fit because of exhaust fitment. Does that make any sense whatsoever? The exterior of the engine kit is the same, right? So any pipe that fits an M8 should fit, shouldn't it? And to make it more specific, the FXDR uses (I think) the exact same headpipe as the FXFBS, yet they don't say the 131 kit won't fit the FXDR ...
Sometimes Harley's fitment notes are just wrong or incomplete, so I m just asking if any FXFBS owners have pursued this and have the definitive answers. Thanks.
https://www.harley-davidson.com/us/en/shop/screamin-eagle-milwaukee-eight-engine-stage-iv-kit-114ci-to-131ci/p/92500095
It contradicts itself, if you search the site for parts for the FXFBS it does bring up this kit, and says it will fit, but then in the "details" tab it specifically says it won't fit.
So... Why? A q&a says it won't fit because of exhaust fitment. Does that make any sense whatsoever? The exterior of the engine kit is the same, right? So any pipe that fits an M8 should fit, shouldn't it? And to make it more specific, the FXDR uses (I think) the exact same headpipe as the FXFBS, yet they don't say the 131 kit won't fit the FXDR ...
Sometimes Harley's fitment notes are just wrong or incomplete, so I m just asking if any FXFBS owners have pursued this and have the definitive answers. Thanks.
There was another thread about this new engine and this was the comment about the fitment note by Hulkss.
I agree, it makes no sense whatsoever that it won't fit all softails.
I agree, it makes no sense whatsoever that it won't fit all softails.
Seasoned HDF Member
Joined: Feb 2009
Posts: 5,642
Likes: 1,985
From: Cleveland Zoo
I see that Harley has released the 131" engine kit for the 114" 2018+ Softails but, in the fitment notes, it says it won't fit the FXFBS Fat Bob 114.
https://www.harley-davidson.com/us/e...1ci/p/92500095
It contradicts itself, if you search the site for parts for the FXFBS it does bring up this kit, and says it will fit, but then in the "details" tab it specifically says it won't fit.
So... Why? A q&a says it won't fit because of exhaust fitment. Does that make any sense whatsoever? The exterior of the engine kit is the same, right? So any pipe that fits an M8 should fit, shouldn't it? And to make it more specific, the FXDR uses (I think) the exact same headpipe as the FXFBS, yet they don't say the 131 kit won't fit the FXDR ...
Sometimes Harley's fitment notes are just wrong or incomplete, so I m just asking if any FXFBS owners have pursued this and have the definitive answers. Thanks.
https://www.harley-davidson.com/us/e...1ci/p/92500095
It contradicts itself, if you search the site for parts for the FXFBS it does bring up this kit, and says it will fit, but then in the "details" tab it specifically says it won't fit.
So... Why? A q&a says it won't fit because of exhaust fitment. Does that make any sense whatsoever? The exterior of the engine kit is the same, right? So any pipe that fits an M8 should fit, shouldn't it? And to make it more specific, the FXDR uses (I think) the exact same headpipe as the FXFBS, yet they don't say the 131 kit won't fit the FXDR ...
Sometimes Harley's fitment notes are just wrong or incomplete, so I m just asking if any FXFBS owners have pursued this and have the definitive answers. Thanks.
https://www.hdforums.com/forum/2018-...l#post19367087
HDF Community Team
Joined: Oct 2018
Posts: 4,347
Likes: 3,392
From: Seattle
Spit balling here, but I'm fairly certain it has to do with the slip-ons and legalities.
HD wasnt able to get the 131 with the stock slip ons to pass EPA/Euro, so the fat bob is out getting a confirmed fitment for legal paperwork reasons.
HD wasnt able to get the 131 with the stock slip ons to pass EPA/Euro, so the fat bob is out getting a confirmed fitment for legal paperwork reasons.
Banned
Joined: Jan 2019
Posts: 3,036
Likes: 1,013
From: Nunya.
The bagger/tourer block won't fit in your frame.
The tourers have the CAT in the headpipe so they're EPA.
Fat Bob has the CAT in the headers from memory so it can/should be EPA.The rest of the Softies have the CAT in the mufflers. I think.
You can buy the jugs, pistons and paraphernalia to build your top end in to a 128/131 of some description for an M8.
Do it I say , do it!.
The tourers have the CAT in the headpipe so they're EPA.
Fat Bob has the CAT in the headers from memory so it can/should be EPA.The rest of the Softies have the CAT in the mufflers. I think.
You can buy the jugs, pistons and paraphernalia to build your top end in to a 128/131 of some description for an M8.
Do it I say , do it!.
Last edited by Agoober; Sep 9, 2020 at 04:33 AM.
Thread Starter
|
Grand HDF Member
Joined: Nov 2017
Posts: 4,251
Likes: 3,134
From: Texas
Thanks for the responses. Still clear as mud, but really, who knows what goes on in Harley's head...
I thought about the legalities and EPA, but that just confused me further because the Fat Bob's exhaust header is the only one that has the catalyst integrated into it, so... Theoretically it should be the most compliant Softail, not the least compliant, right? Who knows...
I'd love to just go with FuelMoto, but they basically refused to do a big bore when I said I wanted to keep the stock exhaust header (I love the 2-1-2 header and dual mufflers look, and refuse to give it up). FuelMoto had never done a big bore FXFBS with the stock header and couldn't make any performance promises, and said the only way they would be comfortable doing it would be if I also got a D&D Fatcat or similar. That was a deal breaker for me, so as much as I would like to, FuelMoto isn't an option for this bike.
So Harley offered the 131 upgrade kit with no replacement header like the Touring bikes require, I thought that this might be the ideal match, but then they say it won't fit (except for where they say it will fit, sigh).
Well, no rush, maybe in October or November the dealers will have "free install" specials running, and maybe by that time the questions will be answered. Until then, still loving the Stage II 114!
I thought about the legalities and EPA, but that just confused me further because the Fat Bob's exhaust header is the only one that has the catalyst integrated into it, so... Theoretically it should be the most compliant Softail, not the least compliant, right? Who knows...
I'd love to just go with FuelMoto, but they basically refused to do a big bore when I said I wanted to keep the stock exhaust header (I love the 2-1-2 header and dual mufflers look, and refuse to give it up). FuelMoto had never done a big bore FXFBS with the stock header and couldn't make any performance promises, and said the only way they would be comfortable doing it would be if I also got a D&D Fatcat or similar. That was a deal breaker for me, so as much as I would like to, FuelMoto isn't an option for this bike.
So Harley offered the 131 upgrade kit with no replacement header like the Touring bikes require, I thought that this might be the ideal match, but then they say it won't fit (except for where they say it will fit, sigh).
Well, no rush, maybe in October or November the dealers will have "free install" specials running, and maybe by that time the questions will be answered. Until then, still loving the Stage II 114!
Last edited by FatBob2018; Sep 9, 2020 at 08:45 PM.
Trending Topics
Seasoned HDF Member
Joined: Feb 2009
Posts: 5,642
Likes: 1,985
From: Cleveland Zoo
Thanks for the responses. Still clear as mud, but really, who knows what goes on in Harley's head...
I thought about the legalities and EPA, but that just confused me further because the Fat Bob's exhaust header is the only one that has the catalyst integrated into it, so... Theoretically it should be the most compliant Softail, not the least compliant, right? Who knows...
I'd love to just go with the Fuel moto, but they basically refused to do a big bore when I said I wanted to keep the stock exhaust header (I love the 2-1-2 header anddand mufflers look, and refuse to give it up). FuelMoto had never done a big bore FXFBS with the stock header and said the only way they would be comfortable doing it would be if I also got a D&D Fatcat or similar. That was a deal breaker for me, so as much as I would like to, FuelMoto isn't an option for this bike.
So Harley offered the 131 upgrade kit with no replacement header like the Touring bikes require, I thought that this might be the ideal match, but then they say it won't fit (except for where they say it will fit, sigh).
Well, no rush, maybe in October or November the dealers will have "free install" specials running, and maybe by that time the questions will be answered. Until then, still loving the Stage II 114!
I thought about the legalities and EPA, but that just confused me further because the Fat Bob's exhaust header is the only one that has the catalyst integrated into it, so... Theoretically it should be the most compliant Softail, not the least compliant, right? Who knows...
I'd love to just go with the Fuel moto, but they basically refused to do a big bore when I said I wanted to keep the stock exhaust header (I love the 2-1-2 header anddand mufflers look, and refuse to give it up). FuelMoto had never done a big bore FXFBS with the stock header and said the only way they would be comfortable doing it would be if I also got a D&D Fatcat or similar. That was a deal breaker for me, so as much as I would like to, FuelMoto isn't an option for this bike.
So Harley offered the 131 upgrade kit with no replacement header like the Touring bikes require, I thought that this might be the ideal match, but then they say it won't fit (except for where they say it will fit, sigh).
Well, no rush, maybe in October or November the dealers will have "free install" specials running, and maybe by that time the questions will be answered. Until then, still loving the Stage II 114!
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Tourer
Joined: Jun 2020
Posts: 290
Likes: 67
From: Fairfax, Va
No technical reason the 131 won't run through the stock exhaust. Sure, you might give up some upper RPM Hp and Tq, but how much is anyone's guess without before/after dyno runs. On the flip side, most folks who decide on such a big cube engine DO want all the power it can offer.
I'd love to drop one of those in my 2018 LR using the stock, but slightly modified, 107 air cleaner and some non descript slip on's with quiet baffles. I'd be ok if it started running out of breath by 4 or 4.5K, I want all the torque between 1500 and 4K. I'd even remove the 131 badging from the engine. A sleeper.
I'd love to drop one of those in my 2018 LR using the stock, but slightly modified, 107 air cleaner and some non descript slip on's with quiet baffles. I'd be ok if it started running out of breath by 4 or 4.5K, I want all the torque between 1500 and 4K. I'd even remove the 131 badging from the engine. A sleeper.