Welcome to UtahHarleyTech.com,
So who’s behind this and what qualifies us as such big twin experts? 
Our track record. The authors of this site have built some of the highest performing nitro fuel drag bikes that have ever blessed a quarter mile. Getting a big twin to run consistently over 200mph requires some serious engineering, precision machining, and god given talent. There are less than a handful of Harley-Davidson dealers that employ this kind of mechanical talent, and the lessons we learned on the track can completely translate into performance gains for your factory Harley-Davidson motorcycle.

Some of the articles we publish are product reviews, other articles are designed to give an elementary explanation of basic engine functions, and sometimes we’ll simply brag about an engine kit that was born right here in the Race Department at Harley-Davidson of Salt Lake City. We don’t have comments or never ending debates on what does or doesn’t work. We’ll skip the opinions and stick to the cold hard facts. We own our results and trust in the fact that our Dyno never lies.

Want to learn more? Don’t bother with scheduling appointments to come talk with us, just swing into Harley-Davidson of Salt Lake City and chat with the Race Department. We promise results and we’re always here to chat.

Up Date! SE M8 Stage 4 117ci Engine Kit.

Up Date to our last post on the SE M8 Stage 4 Engine Kit.

With the break in miles done, we got the bike on the dyno for tuning.

As the graph shows it made a HUGE gain! 117 HP & 117 TQ

Good numbers, the bike is smooth and Very Strong!

Stock vs Stage4 M8

We have a second Stage 4 in the works now, a little different combo so stay tuned.


New Release from Sreamin’ Eeagle!

New Product Release From

Harley Davidson – Screamin’ Eagle


  • SE M8 Stage 4 Engine Kit

  • SE M8 CNC Ported Cylinder Heads

  • SE 11.1:1 CR Pistons

  • SE8 -515 High Lift Cam

  • SE High Flow 64mm Throttle Body

  • SE High Flow Injector Kit (5.5G/SEC)

  • SE High Capacity Clutch Kit


    Sreamin’ Eagles Projected  Horse Power and Torque for the

  •                                Stage 4  117ci Kit

                  125 Horse Power and 115ft Torque at 6000 RPM. 

            We have one in the works right now, I will keep you all posted!

M8 Stage1 Dyno Graph

M8 107ci Stage1 up grade!

This is a 2017 FLHTK with a SE Stage1 Kit.

* SE Street Cannon 4.5 Mufflers, #6490052 (Chrome) $449.95

* SE Heavy Breather #29400263 (Chrome)  $399.95

* SE Pro Street Tuner #41000008C $299.95

The Bike has 1120 miles and runs real nice!


107 Stage1Notice the Torque @ 3000 RPM it is making 100lbs of torque!!

These new motors are real good low end numbers, even stock.


Screamin’ Eagle has you covered!

Milwaukee Eight - Screamin’ Eagle

With all the confusion around as to what can or cant I do as far as Performance Work and keeping my factory warranty, the answer is simple!

Stay with Screamin’ Eagle and you’ll be fine.

The 2017 Harley-Davidson Screamin’ Eagle Performance Parts + Accessories Catalog has many legal performance upgrades from simple Stage1 to Stage3, Cams, Pistons, Stroker Cranks, SE Pro Street Tuner, Air Cleaners, Mufflers.



2017 Milwaukee Eight

2017 Harley Davidson Milwaukee Eight

Harley Introduces a New Engine! 

Let’s look at what’s New.


1. The Milwaukee-Eight motors have eight valves. Although retaining pushrods, the new Milwaukee-Eight powerplants now have four valves per cylinder. According to Harley-Davidson, the new motor has a 50-percent increase in flow over the Twin Cam motors they replace.


2. There are three flavors of the Harley-Davidson Milwaukee-Eight motor. The standard Milwaukee-Eight 107 features oil-cooled cylinder heads and a displacement of 107 cubic inches (1750cc). The Twin-Cooled Milwaukee-Eight 107 is the same displacement, but has liquid cooling for the heads. At the top of the line is the Twin-Cooled Milwaukee-Eight 114, which has liquid-cooled cylinder heads and displaces 114 cubes (1870cc). For the first year, the Milwaukee-Eight powerplants will be used exclusively in Touring and three-wheel models.


3. Power is up 10 percent over the motors they replace. The 107 motors are 11 percent quicker in acceleration from a standing start to 60 mph, as well as roll-on acceleration from 60 to 80 mph, compared to the Twin Cam High Output 103. The 114 cuts eight percent from 0 to 60 and 12 percent from 60 to 80, compared to the Twin Cam 110.


4. The Milwaukee-Eight motor has a single cam, and less maintenance. In addition to a single chain-drive cam, the valve train is adjustment-free with the valve lash set at the factory.


5. With fewer parts in the motor, mechanical noise is reduced. With less mechanical noise, Harley-Davidson can increase the sound output from the exhaust.


6. The Milwaukee-Eight motor is both balanced and rubber-mounted. According to Harley-Davidson, there’s a 75 percent reduction in primary vibration at idle, so the motor will be dancing considerably less at stops.  

7. Liquid cooling keeps the rider cooler. With oil- and radiator fluid pulling heat from the motor, the rider and passenger will find summers less toasty. The exhaust has also been redesigned to direct heat away from the rider.


8. Ergonomics are improved. The Milwaukee-Eight motor has a slimmer primary drive cover, and lower-profile air cleaner cover. Also, the motor gets an Assist and Slip clutch for reduced clutch pull and diminished likelihood of chirping the tires when downshifting.


9. You can power plenty of electric devices with the Milwaukee-Eight motor. The charging system is 50 percent more robust than before, so add accessories to your heart’s content.


10. Harley-Davidson Vice President of Styling and Product Development Strategy Scott Miller on the Milwaukee-Eight powerplant: “The guiding principle behind the Milwaukee-Eight engine was our voice of customer research from every region of the world. Riders asked us to create a new engine designed to enhance their motorcycle touring experience in every way. Those same voices also demanded that we stay true to our legacy and respect the defining elements of a Harley-Davidson V-Twin. It was a big challenge, but one we’ve met. With the Milwaukee-Eight, a new era of Harley-Davidson power, performance and innovation has been forged.”


11. Harley-Davidson Director of Styling Brad Richards on the aesthetics: “The Milwaukee-Eight engine is styled to project power. I compare it to the back of a swimmer, lean in the waist but broad and muscular in the shoulders. The rocker covers look like skin stretched taut over muscle, like the rocker arms are about to burst out of the engine. For the first time since the Knucklehead, the rocker covers reflect the action going on below, and they are massive. When you sit on the bike, you can look down and see more of this engine.”



Screamin’ Eagle 120ST 50 State Legal!!

se_120st_crate_motorScreamin’ Eagle 120ST  

Harley-Davidsons new Screamin’ Eagle 120ST  Engine has been given the 50-state legal certification by CARB rendering the 120ci engine the only “street legal” power plant of that size in all 50 states!

                Fits ’10 – ‘15 Touring models, 50-state compliant.

(reference Executive Orders  M-005-0208 and G-14-012)

                This crate engine allows for a one year Over-the-Counter warranty

                No SWR is allowed

                Not eligible for Extended Service Plan (ESP) through HDFS            

 While the other good news of getting the 120ST engine CARB-certified the 2010-2015 Harley-Davidson Touring Models in all 50 states (excluding Twin-Cooled models) is still pending.The Motor Company’s CARB-cert could be a positive sign of things to come for 2016 Touring Models or Custom Vehicle Operations (CVO) models. 

Now let’s delve into the meat of the engine. The 120ST is essentially similar to that of the configuration of Harley’s beloved Screamin’ Eagle 120R motor: It features the same 4-5/8-inch stroke with a 4.060-inch bore using the same heads, valve springs, and bearings as the 120R, only the 120ST has been “cammed down a bit changing from the R motor’s SE266 cams [with a lift of .658] to SE259 cams [with a lift of .579],” “This was done in order to be street compliant.” 

Developed and tested in Milwaukee, this motor features the finest Screamin’ Eagle components: 

• 4.060 big-bore cylinders

• 4-5/8-inch stroke SE Pro stroker flywheel and rod assembly

• 10.5:1 high-compression nickel-plated forged pistons with Teflon coated skirt

• Titanium SST piston rings

• SE-259E high-lift cams

• New pushrods

• SE high-performance lifters

• CNC-ported MVA heads with automatic compression release

• SE Pro High-Flow 58mm EFI Throttle Body, high flow injectors and manifold clamps

• Machined lower rocker boxes for valve spring collar clearance

• Factory-machined engine cases

• Unique piston oilers for stroker clearance

• SE inner crankcase full complement cam needle bearings

• SE Lefty high-performance crankcase output bearing and nitride bearing race

• SE Performance spark plugs

• 120ST cam cover and cylinder head medallions 

Equipped with a Screamin’ Eagle 58mm Throttle Body that’s 18 percent larger than stock, this engine is capable of producing 106 horsepower and 117 lb-ft of torque at the rear wheel. The crankcase, cylinders and heads are painted black and feature machined aluminum highlights and chrome covers.









Transport Mode

Some customers are discovering discharged batteries after transporting their motorcycle for an extended period of time.

Transport Mode arms the security system with motion detection disabled for one ignition cycle: This allows movement of the vehicle in an armed state.

If the motorcycle is being transported and was not placed in Transport Mode, the security alarm will activate due to motion detection. This will eventually drain the battery.

Battery failure due to not using Transport Mode when transporting the motorcycle is NOT covered by warranty: This is not a defect in materials or workmanship.

Details about entering and exiting Transport Mode are located in the Owner’s Manual.