Basic Stage One Engine

The Stage One engine represents a minimum investment of money and time for improving the performance of a 80 CID Harley-Davidson. Most people can perform these simple modifications themselves. Modifications over stock engine are underlined in the specification list below. The estimated cost for these modifications is under $200. The improvements in performance for performing these minor changes is quite good for the dollars spent. Increases up to 18 HP and 17 Ft.Lbs of torque can be seen in some engines.
This modifications performed on an Low Rider was able to produce 13.8 second quarter mile times with a top speed of 93 MPH at the drag strip. These performance results should be a typical quarter mile result for 600 pound bikes (FXR, FXST, FXD) with an 80 CID Evolution motor.

Year: 1994
Model: EVO
Bore: Stock
Stroke: Stock
Displacement: 1340cc
Cases: H-D
Assembly: H-D
Crankshaft and Flywheel: H-D
Heads: H-D
Intake Valves: Stock Diameter
Exhaust Valves: Stock Diameter
Valve Springs: H-D
Porting: None
Compression Ratio: 8.5:1
Pistons: H-D
Cam: Stock H-D - 208° Duration Intake- 202° Duration Exhaust - .472 Lift
Pushrods: H-D
Carb: Stock CV w/modifications - Idle Mixture out 3.5 turns, Stock needle raised 1/8 inch
Carb Jetting Information: Stock Jets
Manifold: Stock
Air Cleaner: Screaming Eagle K&N
Ignition: Stock Module
Ignition Timing: 32° BTDC
Coil: Stock H-D Dual Fire
Pipes: Stock headers with HD Slip-on Baloney cuts
Dyno Tuning Facilities: CycleRama, Pinellas Park, FL. (813) 546-0889