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Author Topic: Harley 120ST Crate Motor. Don't make fun of the Fat Kid!  (Read 14899 times)

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Fullsac Performance

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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 »
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bkervaski

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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:
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Fullsac Performance

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Re: Harley 120ST Crate Motor. Don't make fun of the Fat Kid!
« Reply #2 on: June 05, 2015, 02:24:36 PM »
Pictures?
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Fullsac Performance

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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 »
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Fullsac Performance

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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!
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Fullsac Performance

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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!
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OBB

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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?
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Gandrtravis

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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?
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JCZ

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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
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Fullsac Performance

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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
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CVOStreetglide

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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
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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
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HOGMIKE

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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)
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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
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GregKhougaz

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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:
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