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Performance and Technical information on stock engines for Harley-Davidson motorcycles. Stage One Harley-Davidson engines involve no internal changes to be made. All modifications are made by bolt-on changes or modifications to external components on the engine. These components include air cleaners, carburetors, exhaust systems and ignition systems. 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. A 1998 FXSFB produced 62 HP with a stock engine, K&N OEM replacement air cleaner element, drilled out air box and stock mufflers with the baffles drilled out. The Horsepower Gallery provides an extensive list of bikes , the power they produced and the major engine components. Camshafts Some of the most popular cams for use in Stage 2 engine are listed below with an approximate grouping of cams with similar specifications and performance. tage 1 improvements must be in place Install the camshaft and new Torrington cam bearing Change Oil and Filter Install new spark plugs Road test the bike Dyno Tune the bike The results of the Dyno testing are excellent as this bike’s performance continues to improve. The test results showed the engine producing 73.9 horsepower @ 5950 RPM and 78.1 ft. lbs. of torque @ 4100 RPM. This particular engine combination uses 3 very popular components: The Andrews EV-27 cam, a Crane HI-4E ignition module and a Thunderheader.

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