Air Cleaner and tune- 121 CVO
Thread Starter
|
Intermediate
Joined: Jun 2010
Posts: 31
Likes: 5
Air Cleaner and tune- 121 CVO
Evening All,
So I am getting mixed advice from friends. I have a 2024 CVO RG (121 VVT) and some are telling me that since I have the stock head pipe, I don't need to tune the bike when I replace the air cleaner from stock. I have the stock head pipe with Khrome Works slip ons and no other mods. What is the truth, even forums and google are all over the place. TIA...Looking to swap out to the Performance Machine cleaner-
So I am getting mixed advice from friends. I have a 2024 CVO RG (121 VVT) and some are telling me that since I have the stock head pipe, I don't need to tune the bike when I replace the air cleaner from stock. I have the stock head pipe with Khrome Works slip ons and no other mods. What is the truth, even forums and google are all over the place. TIA...Looking to swap out to the Performance Machine cleaner-
Seasoned HDF Member
Joined: Jan 2008
Posts: 13,621
Likes: 11,353
From: State of Confusion
Evening All,
So I am getting mixed advice from friends. I have a 2024 CVO RG (121 VVT) and some are telling me that since I have the stock head pipe, I don't need to tune the bike when I replace the air cleaner from stock. I have the stock head pipe with Khrome Works slip ons and no other mods. What is the truth, even forums and google are all over the place. TIA...Looking to swap out to the Performance Machine cleaner-
So I am getting mixed advice from friends. I have a 2024 CVO RG (121 VVT) and some are telling me that since I have the stock head pipe, I don't need to tune the bike when I replace the air cleaner from stock. I have the stock head pipe with Khrome Works slip ons and no other mods. What is the truth, even forums and google are all over the place. TIA...Looking to swap out to the Performance Machine cleaner-
Road Warrior
Joined: Feb 2017
Posts: 1,522
Likes: 641
From: Saint Charles, Missouri
If you have already changed the mufflers and now want to change the air cleaner assembly, YES a new tune is in order. You can change one, either the mufflers, or the air cleaner assembly and no new tune is needed, but when you change both, time for a new tune.
Road Master
Joined: Jul 2019
Posts: 768
Likes: 430
From: CLT NC
Make sure you have proper baffles in the Kromewerks muffflers as the open cores are WAY too big without them.
Three fellow riders had Kromewerks mufflers with no baffles and all their bikes had very weak bottom end. Fuel Moto advised proper baffles to get bottom end back and after install in all three bikes all now run strong on the bottom end again.
Very good read here: https://university.fuelmotousa.com/a...v-twin-engines
Three fellow riders had Kromewerks mufflers with no baffles and all their bikes had very weak bottom end. Fuel Moto advised proper baffles to get bottom end back and after install in all three bikes all now run strong on the bottom end again.
Very good read here: https://university.fuelmotousa.com/a...v-twin-engines
Last edited by VortecCPI; Jul 26, 2025 at 08:37 AM.
Thread Starter
|
Intermediate
Joined: Jun 2010
Posts: 31
Likes: 5
" Make sure you have proper baffles in the Kromewerks muffflers as the open cores are WAY too big without them.
Three fellow riders had Kromewerks mufflers with no baffles and all their bikes had very weak bottom end. Fuel Moto advised proper baffles to get bottom end back and after install in all three bikes all now run strong on the bottom end again.
Very good read here: https://university.fuelmotousa.com/a...v-twin-engines
Thanks for the info, good looking out. The 88s were such simpler machines...but the new ones do rip so it's a good trade off. thanks again..C
Three fellow riders had Kromewerks mufflers with no baffles and all their bikes had very weak bottom end. Fuel Moto advised proper baffles to get bottom end back and after install in all three bikes all now run strong on the bottom end again.
Very good read here: https://university.fuelmotousa.com/a...v-twin-engines
Thanks for the info, good looking out. The 88s were such simpler machines...but the new ones do rip so it's a good trade off. thanks again..C
Last edited by cfabrizio; Jul 26, 2025 at 02:17 PM.
Trending Topics
Club Member
Joined: Jul 2008
Posts: 352
Likes: 78
From: South Carolina
" Make sure you have proper baffles in the Kromewerks muffflers as the open cores are WAY too big without them.
Three fellow riders had Kromewerks mufflers with no baffles and all their bikes had very weak bottom end. Fuel Moto advised proper baffles to get bottom end back and after install in all three bikes all now run strong on the bottom end again.
Very good read here: https://university.fuelmotousa.com/a...v-twin-engines
Thanks for the info, good looking out. The 88s were such simpler machines...but the new ones do rip so it's a good trade off. thanks again..C
Three fellow riders had Kromewerks mufflers with no baffles and all their bikes had very weak bottom end. Fuel Moto advised proper baffles to get bottom end back and after install in all three bikes all now run strong on the bottom end again.
Very good read here: https://university.fuelmotousa.com/a...v-twin-engines
Thanks for the info, good looking out. The 88s were such simpler machines...but the new ones do rip so it's a good trade off. thanks again..C
Khrome Werks - Perforate Performance Insert
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
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
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
Stellar HDF Member
Joined: Nov 2012
Posts: 2,620
Likes: 1,091
From: Eastern IA
Call Steve at GMR ,817-741-2000 he's been doing alot of these ,tuning with the new Impact Wiring Solutions ECM , he has been getting great results on the VVT motors just doing the mods you have done.