131 Engine Upgrade started!
Novice
Joined: Dec 2020
Posts: 17
Likes: 1
From: CA
131 in da house
I'm happy to find out the mpg with the mighty 131ci on this link.I have the kit with many more modifications/upgrades. I will put it on my 2019 Harley-Davidson Heritage Classic FLHCS 114 Softail. The strange thing about the Stage IV 131ci Kit is that some Harley-Davidson Dealerships say it's not legal in California, and some say it's legal. This is in the San Francisco Bay Area. Thank you.
Road Warrior
Joined: Sep 2007
Posts: 1,954
Likes: 148
From: Augusta, GA
Have they fixed the valve spring issue with the CNC heads? Buddys 117 build recently dropped a valve due to valve spring failure on CNC heads for 2017 107. He does not dog his bike and doesnt have a lot of miles.
Club Member
Joined: May 2018
Posts: 2,373
Likes: 2,309
From: Tampa Bay Area
Appreciate the info in this thread. I similarly love my bike and plan to keep it rolling...
I should end this year close to 50K miles and see close to 70k by the end of next year if things go as planned. At that point Ill be looking at a rebuild if for nothing less than proper hygiene.
Should have a good idea of the 131 experience by then (performance, reliability, issues, etc.). I wont be looking to go as big as possible when the time comes, just looking for a reasonable bump in performance to go along with a solid rebuild to take me confidently through the next 70k miles.
Question I have at the moment is whether there are advantages / disadvantages re: the complete crate engine vs. the kit. Im on a 2018 CVO Street Glide w/ 117.
I should end this year close to 50K miles and see close to 70k by the end of next year if things go as planned. At that point Ill be looking at a rebuild if for nothing less than proper hygiene.
Should have a good idea of the 131 experience by then (performance, reliability, issues, etc.). I wont be looking to go as big as possible when the time comes, just looking for a reasonable bump in performance to go along with a solid rebuild to take me confidently through the next 70k miles.
Question I have at the moment is whether there are advantages / disadvantages re: the complete crate engine vs. the kit. Im on a 2018 CVO Street Glide w/ 117.
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