Rev Tech® High-Performance Kits for Evolution Big Twin Models
These kits fit FXR models (except FXRT and FXRD) 1984 through 1992, and include all of the Rev Tech® high-performance parts described on this page.  The complete kit is the same as the one installed on our Rev Tech® motorcycle which won the Dyno shoot out at Sturgis in 1992 and Daytona in 1993.  When installed on a stock 80 cubic inch motor, this kit is capable of producing at least 90 horsepower.

Rev Tech® Adjustable Tapered Pushrods
These American-made adjustable pushrods are the same as the ones installed in our Rev Tech® FXR that makes 92 horsepower at the rear wheel.  Constructed form tapered aluminum tubing with chromemoly adjusters, they are the perfect choice for use with our Rev Tech® '40' cam.
Rev Tech® / SuperTrapp Chrome 2-into-1 Exhaust System
This exhaust system packs more horsepower with less weight, and provides both wave and outlet anti-reversionary tuning capabilities that boost power over the entire RPM range.   This unique Rev Tech® SuperTrapp pipe design features an adjustable disc system at the exhaust tip.  Adding discs increases the size of the exhaust opening and reduces back pressure; decreasing the number of discs reduces the exhaust gas outlet and decreases noise.  This ability to add or remove discs enables the rider to wave tune the exhaust for maximum power.
Rev Tech® Electronic Single-Fire Ignition System
This ignition system is a high energy inductive storage system that replaces the Original Equipment electronic ignition.  It's Hall cell triggered and unaffected by RPM changes, dirt, oil or any other contaminants that may get into the ignition housing.   It utilizes magnets in the rotor to turn the coil on and off producing the correct dwell time of 180º (camshaft).  This minimizes coil heating and keeps the primary resistance low which keeps the primary current and energy output at optimum levels.   These same magnets are mounted in a planar configuration relative to the Hall cell at a radius of just under an inch resulting in perfect timing accuracy because the module-to-module timing is inherent in the design and never needs to be adjusted.   Benefits of the single-fire system include increased gas mileage, prolonged spark plug life, easier starts, and a smoother ride with more available horsepower.  All of this is accomplished by not firing both sparkplugs every time a cylinder comes to top-dead-center, but only the necessary plug.  This means that the piston which is in the overlap position and still has any raw gas in the cylinder will not be fired needlessly, and the motor will not be fighting itself.
Rev Tech® Coils
These high-performance ignition coils produce up to 30,000 volts of spark energy to insure a clean fuel burn and maximize ignition efficiency in this four-plug ignition system.
Heavy-Duty Motor Mount and Coil Bracket Kit
This heavy duty motor mount and dual coil bracket with cover mounts the Rev Tech® dual coil set securely and gives a nice clean look to your motorcycle.

Rev Tech® Cylinder Heads for Evolution® Big Twin and Sportster® Models
True 'bolt-on' race-quality high-performance heads for street bikes. Completely American-made and cast from '356' aircraft-quality aluminum heat-treated to T6' and then machined and assembled by some of the biggest names in the industry. Unlike other companies manufacturing or modifying cylinder heads, RevTech® heads are ready-to-install with no 'down-time.' The intake ports have been reshaped and raised .100" using 'D-shape' technology to increase flow, yet still work with all of the stock intake manifolds. The combustion chambers have been cast and machined into semi-bathtub shapes that are more turbulent and thermally efficient than stock chambers, and are available in stock and high-compression versions to fit Evolution® Big Twin and Sportster®   models, and two versions for Evolution® Big Twin models with big bore cylinders. The high-compression heads have compression ratio of approximately 10:1 (stock bore and stroke, and stock pistons with valve-relief pockets). The valves, valve seats and spring components are high-performance automotive-quality parts.The one-piece stainless steel valves have nitrided stems, hardened tips and swirl-polished heads. The 1.940" diameter intake valves permit the cylinders to fill with air more efficiently creating large increases in torque and horsepower. The tulip shaped exhaust valves have 1.610"-diameter heads and the special heat-treated, high nickel-content valve seats are compatible with all types of fuels. The 3-piece valve springs feature a flat wound damper spring to eliminate spring surge and will work with cams up to .600" lift. All RevTech® cylinder heads are set up for dual 12mm spark plugs and come complete with a pair of spark plugs as well as a pair of socket head plugs for single spark plug applications. A hardware kit containing the exhaust and top motor mount studs is also included. Sold in sets.

'Street Legal' Stock Compression Heads
These heads are approved for use on pollution controlled motor vehicles. You get the same bench-tested high flow porting and high-performance valve train in a street-legal package. Not intended for use on fuel-injected models.

High Compression Heads for Stock Bore
Smaller combustion chambers give approximately 10:1 compression for an even bigger jump in performance.
Not intended for use on fuel-injected models.

High Compression Heads for Evolution® Sportster® Models
Smaller combustion chambers give approximately 10:1 compression for an even big-bigger jump in performance. Not intended for use on fuel-injected models

High Compression Cylinder Head and Piston Kits for Evolution® Sportster® Models
Heads are matched with high-compression forged pistons manufactured for Custom Chrome® by J.E. Pistons. Kits include heads, pistons, and rings. For all 4-speed 1200ccEvolution® Sportster® models 1986 thru 1990.

No shortcuts were taken during the development of these high-performance cylinder heads.Hundreds of Dyno runs were conducted to compile all the necessary data needed to demonstrate that Rev Tech® heads are one of the most cost-efficient ways to get maximum performance out of any motor. The RevTech® heads produce greater 'average air flow' than any heads available, resulting in more torque, horsepower and overall performance from your motor (see charts).Any motor will be greatly affected by whatever cam, carburetor, exhaust and ignition system is used.Custom Chrome® recommends the use of its full line of RevTech® high-performance cams, carburetors-, ignition and exhaust systems to obtain maximum performance and reliability.

Benefits
Increased horsepower and torque
Set up for dual 12mm spark plugs
Reshaped, more turbulent and thermally efficient combustion chambers
Easy installation. Compatible with all stock hardware
No waiting for stock heads to be modified
Exhaust studs and top motor mount studs supplied .