www.CVOHARLEY.com

Please login or register.

Login with username, password and session length
Advanced search  
Pages: [1] 2  All

Author Topic: Harley 120ST Crate Motor. Don't make fun of the Fat Kid!  (Read 14893 times)

0 Members and 1 Guest are viewing this topic.

Fullsac Performance

  • Vendor
  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1768
  • Never ride with a Halfsac! Insist on Fullsac Perf!
    • AZ


    • CVO1: 2024 Road Glide
    • Fullsac Performance
Harley 120ST Crate Motor. Don't make fun of the Fat Kid!
« on: June 05, 2015, 02:10:33 PM »
A while back Harley released a detuned version of their 120R crate motor, the 120ST. With a claimed 104 HP it was reviewed
with laughter from many on this forum and a few others. I had been wanting to upgrade our 2012 CVO shop bike with a 120R. I noticed for the same money, the 120ST came with a 58 SE throttle body with 5.3 injectors. It also came with the 259E cam instead of the big 660 lift. Not being a fan of either cam it made sense to me to go with the ST version and get the throttle body. So I pulled the trigger, it showed up as promised 58TB and 5.3 injectors. Just to be on the safe side, removed the heads, pulled a valve spring and ran a pressure test just to be assured there were no surprises or issues with bolting in a Tman 660SM. Everything checked out, just like the 120R, 183 pounds on the seat and 497 at 660 lift.  bolted in the Tman, a set of SE +.030 solid pushrods and let her rip! Got just what I was after, big TQ early! 100 FT pounds at 2K and 125 FT pounds at 3K. Hard deal to beat for less than 6K.

The details and the results!   :2vrolijk_21:

Bone stock Harley 120ST Crate Motor
SE 58 TB, 5.3 injectors
Tman 660SM cam set.
SE +.030 pushrods.
DX Pipe
2.0 CVO Power cores.

Steve George
Fullsac Performance

« Last Edit: June 05, 2015, 02:16:56 PM by Fullsac Performance »
Logged
Never argue with idiots. They will beat you with experience.

bkervaski

  • Newbie
  • *
  • Offline Offline
  • Posts: 42
  • www.CVOHARLEY.com
    • AL

Re: Harley 120ST Crate Motor. Don't make fun of the Fat Kid!
« Reply #1 on: June 05, 2015, 02:15:18 PM »
Awesome and ...  :worthless:
Logged

Fullsac Performance

  • Vendor
  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1768
  • Never ride with a Halfsac! Insist on Fullsac Perf!
    • AZ


    • CVO1: 2024 Road Glide
    • Fullsac Performance
Re: Harley 120ST Crate Motor. Don't make fun of the Fat Kid!
« Reply #2 on: June 05, 2015, 02:24:36 PM »
Pictures?
Logged
Never argue with idiots. They will beat you with experience.

Fullsac Performance

  • Vendor
  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1768
  • Never ride with a Halfsac! Insist on Fullsac Perf!
    • AZ


    • CVO1: 2024 Road Glide
    • Fullsac Performance
Re: Harley 120ST Crate Motor. Don't make fun of the Fat Kid!
« Reply #3 on: June 05, 2015, 02:25:40 PM »
Valve spring tester.
« Last Edit: June 05, 2015, 02:34:12 PM by Fullsac Performance »
Logged
Never argue with idiots. They will beat you with experience.

Fullsac Performance

  • Vendor
  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1768
  • Never ride with a Halfsac! Insist on Fullsac Perf!
    • AZ


    • CVO1: 2024 Road Glide
    • Fullsac Performance
Re: Harley 120ST Crate Motor. Don't make fun of the Fat Kid!
« Reply #4 on: June 05, 2015, 02:26:51 PM »
Black and grey meet for the first time!
Logged
Never argue with idiots. They will beat you with experience.

Fullsac Performance

  • Vendor
  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1768
  • Never ride with a Halfsac! Insist on Fullsac Perf!
    • AZ


    • CVO1: 2024 Road Glide
    • Fullsac Performance
Re: Harley 120ST Crate Motor. Don't make fun of the Fat Kid!
« Reply #5 on: June 05, 2015, 02:32:46 PM »
120ST as delivered!
Logged
Never argue with idiots. They will beat you with experience.

OBB

  • 5k CVO Member
  • ***
  • Offline Offline
  • Posts: 5320
  • aka Ohiobellboy
    • OH


    • CVO1: 2011 Slate/Black SERGU** traded
    • CVO2: 2015 Double Blue SERGU
    • CVO3: 2012 SERG Blue
Re: Harley 120ST Crate Motor. Don't make fun of the Fat Kid!
« Reply #6 on: June 05, 2015, 02:43:49 PM »
So what are you going to use for a clutch in that setup?
Logged
PHOTOBUCKET IS HOLDING MY PIX HOSTAGE!!!

Gandrtravis

  • Full CVO Member
  • ***
  • Offline Offline
  • Posts: 236
  • www.CVOHARLEY.com
    • AB


    • CVO1: 2008 cvo dyna inferno red and desert black sold
    • CVO2: 2014 cvo road king tribal orange and galactic black traded
    • CVO3: 2018 cvo road glide gunship grey
Re: Harley 120ST Crate Motor. Don't make fun of the Fat Kid!
« Reply #7 on: June 05, 2015, 02:53:17 PM »
Nice build good torque would there still be a one year warrenty with the 660 cam or would you have to through the factory 259 back in if you wanted to have a warrenty job done?
Logged

JCZ

  • Global Moderator
  • 10K CVO Member
  • *****
  • Offline Offline
  • Posts: 23604
    • AZ


    • CVO1: 04 SEEG...sold
    • CVO2: 10 SESG...sold
    • CVO3: 13 FLHTCSE 8
Re: Harley 120ST Crate Motor. Don't make fun of the Fat Kid!
« Reply #8 on: June 05, 2015, 02:56:32 PM »
Nice Steve.  Are you buying rear tires by the truck load?  :P
Logged
Never trade the thrills of living for the security of existence.  Remember...it's the journey, not the destination!

West Coast GTG   
Reno, NV (04), Reno, NV (05),  Cripple Creek, CO (06)  Hood River, OR (09), Lake Tahoe, CA (11) Carmel, CA (14), Ouray CO (15) Fortuna, Ca. (16)

Fullsac Performance

  • Vendor
  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1768
  • Never ride with a Halfsac! Insist on Fullsac Perf!
    • AZ


    • CVO1: 2024 Road Glide
    • Fullsac Performance
Re: Harley 120ST Crate Motor. Don't make fun of the Fat Kid!
« Reply #9 on: June 05, 2015, 03:05:36 PM »
I went with a simple Aim lock up hat on the stock CVO clutch. Made it through 73 dyno pulls no issue.

Warranty? Didn't even know it had one! Lol.. If I broke it I would fix it myself.

Tires? I know a dealer!

SG
Logged
Never argue with idiots. They will beat you with experience.

CVOStreetglide

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1251

    • CVO1: 2015 CVO Street Glide
    • CVO2: 2012 CVO Street Glide (Sold)
    • CVO3: 2010 CVO Street Glide (Sold) CVO4: 2006 VRXSE DESTROYER (Sold)
Re: Harley 120ST Crate Motor. Don't make fun of the Fat Kid!
« Reply #10 on: June 05, 2015, 03:07:35 PM »
Steve:

Great results!!

I'm hoping the quality control is better on the ST too.

I'll be watching to see what you do next to improve what MAY be Harley's next production big motor platform.

...now where do I want to drill to add the "shower head" passages... ☔️ ☔️ ☔️   :D :D
Logged

Fullsac Performance

  • Vendor
  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1768
  • Never ride with a Halfsac! Insist on Fullsac Perf!
    • AZ


    • CVO1: 2024 Road Glide
    • Fullsac Performance
Re: Harley 120ST Crate Motor. Don't make fun of the Fat Kid!
« Reply #11 on: June 05, 2015, 03:23:09 PM »
Quote from: CVOStreetglide on June 05, 2015, 03:07:35 PM
Steve:

Great results!!

I'm hoping the quality control is better on the ST too.

I'll be watching to see what you do next to improve what MAY be Harley's next production big motor platform.

...now where do I want to drill to add the "shower head" passages... ☔️ ☔️ ☔️   :D :D

Crank run out was good at .002  The valve job however, left a lot on the table. Only making 121 HP really shows that.
There's another 10 HP in just touching up the heads and bumping the compression that was less than advertised.
Hard to complain for the price and just bolting it together as is with no massaging.

SG
Logged
Never argue with idiots. They will beat you with experience.

HOGMIKE

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 2426
  • 65 FLH 93" + others
Re: Harley 120ST Crate Motor. Don't make fun of the Fat Kid!
« Reply #12 on: June 05, 2015, 03:27:45 PM »
I can swing by the shop on my way North to pick up your old motor!
 8)
Logged
HOGMIKE

Fullsac Performance

  • Vendor
  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1768
  • Never ride with a Halfsac! Insist on Fullsac Perf!
    • AZ


    • CVO1: 2024 Road Glide
    • Fullsac Performance
Re: Harley 120ST Crate Motor. Don't make fun of the Fat Kid!
« Reply #13 on: June 05, 2015, 04:05:57 PM »
Quote from: HOGMIKE on June 05, 2015, 03:27:45 PM
I can swing by the shop on my way North to pick up your old motor!
 8)

Its all packaged up and on the shelf. Going to hang on to it for now.

SG
Logged
Never argue with idiots. They will beat you with experience.

GregKhougaz

  • It's a Two Wheeled World.
  • Global Moderator
  • 5k CVO Member
  • *****
  • Offline Offline
  • Posts: 9574
    • CA


    • CVO1: '22 BMW Grand America
    • CVO2: '18 Porsche C4 GTS
    • CVO3: '22 Porsche Macan GTS and my mountain bike.
Re: Harley 120ST Crate Motor. Don't make fun of the Fat Kid!
« Reply #14 on: June 05, 2015, 04:09:40 PM »
Looks great, Steve!   :huepfenjump3:   Waiting for the "wheelie video."    :computer:   :vrolijk_26:
Logged


"We've got some tall tales we love to tell.  They may not be true but we sure do remember them well." 
 Sawyer Brown

When you come to a fork in the road... take it!
Pages: [1] 2  All
« previous next »
 

Page created in 0.245 seconds with 25 queries.