Stage 1 EVO
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Stage 1 EVO
Stage 1 Modifications
Build a 64 horsepower 1340 Evolution engine
Performance and Technical information on basic modifications to a stock Harley-Davidson 1340 Evolution motorcycle engine.
Build the ultimate in a stock bike engine
or
How to get 64HP from your 1340 Evolution engine.
One of the first things most people do shortly after they get their new motorcycle is start to modify the engine. In the time honor tradition of Harley-Davidson, the first thing to go on most bikes are the stock mufflers in an effort to improve the sound. This is usually the first in a long list of changes to the engine. Changes to the carburetor and ignition system also rank very high on the first to change list. These changes are done to improve the performance of the bike.
There are many companies out there that are competing for the dollars that Harley owners are willing to spend on their bikes. As an owner, you will be bombarded with a vast array of promises, claims and inaccuracies in an effort to get your money. Reading between the lines on many of the performance claims can be bewildering.
Does the Harley-Davidson world need another stock engine modification article? I decided it does, since the results obtained by the engine upgrades listed here provided significantly better results than those documented by the popular magazines aimed at the V-Twin crowd.
How to build your own Stage One engine
Stage One engines involve no internal changes to the engine. All modifications are made by bolt-on changes to external components on the engine. These components include air cleaners, carburetors, exhaust systems and ignition systems. No special tools or training is required to perform these modifications, although it is recommended you are comfortable working on your own motorcycle.
Over the past several years we have installed and tested many manufacturers components. The list of parts used in building the ultimate 'bolt-on parts' engine is the end result of this testing. The best and least expensive of the individual components was selected and tested as a single package. The fact that virtually all the parts used for the project are from Harley-Davidson is a coincidence. There was no plan or idea to use mostly Screamin' Eagle parts for this project.
All the parts used are readily available through your Harley-Davidson Dealer except for the spark plug wires, which can be ordered directly through Magnecor. The components were installed and tested on a 1997 FXD Dyna Super Glide. No special tuning was performed to achieve the results listed. All components were installed according to the manufacturer instructions supplied.
Building the ultimate 'bolt-on parts' engine
Install the mufflers
Install the air cleaner kit
Re-jet the carburetor
Install the ignition module
Install the ignition coil
Install the spark plug wires
Road test the bike
Dyno Tune the bike
The results of the Dyno testing simply astounded us. The test results showed the engine producing 63.8 horsepower @ 5350 RPM and 72.5 ft. lbs. of torque @ 3650 RPM. Three separate runs provide identical results. These performance numbers produced where real. The results were so surprising that additional research was done to make sure that Harley-Davidson hadn't come up with new cam design since 1996. The stock cam is still the same Harley "N" grind that has been around since 1992.
The Dyno Run Sheet show the improvement in power.
The results are due to a well matched set of parts being bolted-on to the engine. Seems that a little of that money the Dealers send back to Milwaukee is going into engine performance research.
The ability to create the same results with other manufacturers parts is a distinct possibility. There is an optional parts list of components that should perform as well as the parts tested. Please be aware that the parts listed in the Optional Stage 1 parts list have not been dyno teste
Build a 64 horsepower 1340 Evolution engine
Performance and Technical information on basic modifications to a stock Harley-Davidson 1340 Evolution motorcycle engine.
Build the ultimate in a stock bike engine
or
How to get 64HP from your 1340 Evolution engine.
One of the first things most people do shortly after they get their new motorcycle is start to modify the engine. In the time honor tradition of Harley-Davidson, the first thing to go on most bikes are the stock mufflers in an effort to improve the sound. This is usually the first in a long list of changes to the engine. Changes to the carburetor and ignition system also rank very high on the first to change list. These changes are done to improve the performance of the bike.
There are many companies out there that are competing for the dollars that Harley owners are willing to spend on their bikes. As an owner, you will be bombarded with a vast array of promises, claims and inaccuracies in an effort to get your money. Reading between the lines on many of the performance claims can be bewildering.
Does the Harley-Davidson world need another stock engine modification article? I decided it does, since the results obtained by the engine upgrades listed here provided significantly better results than those documented by the popular magazines aimed at the V-Twin crowd.
How to build your own Stage One engine
Stage One engines involve no internal changes to the engine. All modifications are made by bolt-on changes to external components on the engine. These components include air cleaners, carburetors, exhaust systems and ignition systems. No special tools or training is required to perform these modifications, although it is recommended you are comfortable working on your own motorcycle.
Over the past several years we have installed and tested many manufacturers components. The list of parts used in building the ultimate 'bolt-on parts' engine is the end result of this testing. The best and least expensive of the individual components was selected and tested as a single package. The fact that virtually all the parts used for the project are from Harley-Davidson is a coincidence. There was no plan or idea to use mostly Screamin' Eagle parts for this project.
All the parts used are readily available through your Harley-Davidson Dealer except for the spark plug wires, which can be ordered directly through Magnecor. The components were installed and tested on a 1997 FXD Dyna Super Glide. No special tuning was performed to achieve the results listed. All components were installed according to the manufacturer instructions supplied.
Building the ultimate 'bolt-on parts' engine
Install the mufflers
Install the air cleaner kit
Re-jet the carburetor
Install the ignition module
Install the ignition coil
Install the spark plug wires
Road test the bike
Dyno Tune the bike
The results of the Dyno testing simply astounded us. The test results showed the engine producing 63.8 horsepower @ 5350 RPM and 72.5 ft. lbs. of torque @ 3650 RPM. Three separate runs provide identical results. These performance numbers produced where real. The results were so surprising that additional research was done to make sure that Harley-Davidson hadn't come up with new cam design since 1996. The stock cam is still the same Harley "N" grind that has been around since 1992.
The Dyno Run Sheet show the improvement in power.
The results are due to a well matched set of parts being bolted-on to the engine. Seems that a little of that money the Dealers send back to Milwaukee is going into engine performance research.
The ability to create the same results with other manufacturers parts is a distinct possibility. There is an optional parts list of components that should perform as well as the parts tested. Please be aware that the parts listed in the Optional Stage 1 parts list have not been dyno teste
Stage I
Joined: Aug 2011
Posts: 1
Likes: 0
From: minnesota
stage 1
Hi, I have an early (1991) 1340 evo that I would like to get a little more power from so I can keep up a little more with my friends with their newer and more powerful bikes.
I noticed in you article that you made reference to the cams in the 1992 and newer bikes.
What kind of difference in performance can I expect to get out of my 1991 49 state bike if I do the upgrades you are recommending,
Thanks,
Miles
I noticed in you article that you made reference to the cams in the 1992 and newer bikes.
What kind of difference in performance can I expect to get out of my 1991 49 state bike if I do the upgrades you are recommending,
Thanks,
Miles
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