high performance harley davidson modifications, cylinder head design, twin cams, evolutions, evos, shovelhead, fuel injection tuning, caruretor tuning, dyno tuning, engine rebuild, engine rebuilds, harley engine rebuilds
The Harley-Davidson ® High - Performance Cylinder Head Design and Engine Modification Shop
Complete Engine Rebuilds - Fuel Injection and Carburetor Tuning - Chassis Work - Parts - and More ..
Very competitive pricing

Harley-Davidson® High-Performance & Reliability Specialists


johnson engine technology, high performance, performance modifications, contact information, parts, service, performance pacages, how to schedule an appointment, testimonials, dyno runs, photos, job status, warranty information


Ryder's bike left our shop in July of 2002. On 1/6/09 (7 years later) on his own inclination Ryder emailed us an updated testimonial as follows:
WHAT DID J.E.T. DO?: Bored to  1550cc (95 Cu.In.), JET Ported heads, TW-37 cams, HD 44CV Carburetor, JET 44CV intake manifold, K&N reusable Air cleaner, Dyna ignition module, Cycle Shack exhaust
TESTIMONY: Just wanted to expand on "do what you did to Walton's bike" testimonial.   I'm very pleased with the results on the JET 95 CuIn upgrade to my 02' Softail Duece.  I have since taken the bike cross country from Seattle, WA back to Stonington, CT and put over 14K miles on the bike since the upgrade.  Still has that same smooth power like the day it left your shop.

Thanks Again.
Ryder Thompson
Charleston, SC
(read more testimonials from satisfied customers)


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AirStack =




2007 and later HIGH-PERFORMANCE PACKAGES for your Harley TC



NEW PRODUCTS: (click on pics for more info)  

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10% discount for Active Duty service men & women

J.E.T. Pistons for XBs and 1200 Sportsters
Manufactured by CP Pistons for J.E.T.


J.E.T. Tees
(free with complete performance package)
          The New & Improved J.E.T. AirStack
  J.E.T. Modified Stock Throttle Body
48mm and 51mm
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  Read the latest Testimonial!  You'll be sure to want yours modified too!  


The J.E.T. 51mm CV Intake Manifold

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J.E.T. CVN Cylinder Head CNC Porting     EFI Fuel Mapping of OE ECU Using Direct Link Software
  high performance cylinder head design, cvn cylinder head porting, johnson engine technology       fuel injection mapping, fuel injection remapping, OE ECU remapping, OE ECU mapping,

buell xb racing, buell xb 12R, road racing

Johnson Engine Technology, Inc. has Buell ® XB performance packages for both street and race use.

Click here to enter the J.E.T.'s road racing website, jetroadracing.com.


2005 J.E.T. Modified Buell XB12R

J.E.T.= 102 HP, 88 FT LBS


Johnson Engine Technology™ is in the business of Harley - Davidson ®/Buell® high performance cylinder heads and engine modification.  Whether you want to smoke your tires or just your friends, Johnson Engine Technology,Inc™ (J.E.T.) is the place to go to get the job done right the first time.  We are a full machine shop and with over 20 years of engine modification knowledge and experience, J.E.T. has much to offer the Harley Davidson / Buell owner.

What do we do?

-J.E.T. cylinder head design -engine modification
-J.E.T. intake manifolds   -complete engine rebuilds
-J.E.T. 560 camshafts  -transmission work
-J.E.T. custom push rods     -piston modification
-efi and carburetor engine tuning -chassis work
  Check out our SERVICE page for your specific service needs.

We at Johnson Engine Technology,Inc.™ (J.E.T.) efficiently solve the battle of Harley Davidson ®/Buell ® high performance vs reliability. By reliability we mean keeping the mechanical side of the engine in proper working order at all times.  By performance we mean the ability to make peak horsepower (HP) and torque (measured in ft lbs), while still having extremely good low end and mid-range power.  Just with J.E.T. heads alone , Johnson Engine Technology, Inc.™ can provide you with increased horsepower and torque, better gas mileage (40-50 miles/gal), cooler running temperature, and smoother running.  For information about J.E.T. heads, go to our ABOUT J.E.T. page.  You could also benefit from reading the published article titled "The Johnson System,Getting More From Less" by Kevin Cameron.  Or you can see the proof yourself by checking out our J.E.T. DYNO RUN page which compares various J.E.T. modified Harley - Davidson and Buell motorcycles to stock bikes.


God Bless America
God is blessing America!


I have put on just over a thousand miles since you completed my 95" build.  What can I say...Wow!  It's incredible...the added power is great, but I can't believe how smooth and refined this engine runs.  It runs smoother now than stock or when I had it at Stage 1... more
David Allen

West Warwick, RI


"Dear everyone at Johnsons, 
I had a great ride home...the motorcycle performance was outstanding...the roll on power that I had climbing the hills made the bike feel even better than I could have hoped for..."
Andy Bruns

Cazenovia, NY

Thanks for the fine job your team performed on the parts that I sent you. It is always a pleasure to open up the boxes and see everything clean and neatly fit and ready for assembly. The combustion chamber CNC work is very nice and I would like to make sure that all of the heads that we send in the future are relieved in that fashion..."
Mark Simiola
Lyme, CT
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