S&S Cycle 49-State EPA Certified Engines - Manual (Page 2)

INSTALLATION OVERVIEW
This S&S® 49-State EPA Certified Engine is approved for use in assembled highway motorcycles and conforms to USEPA regulations applicable to the
model year in which it was produced. A small volume manufacturer, kit manufacturer or assembler using this engine does not have to apply for a
separate emission certificate with the EPA. A vehicle built according to the requirements given is considered a certified vehicle by the EPA.
Included in these instructions are requirements the manufacturer of the motorcycle, kit manufacturer, or assembler is required to follow in
order to insure the engine meets exhaust emission standards. Prior to starting installation of this engine these requirements should be read and
understood.
Failure to meet the requirements outlined in the instructions is a violation of the Clean Air Act and will make the manufacturer of the motorcycle, kit
manufacturer, or assembler subject to penalties and fines.
INSTALLATION REqUIREMENTS
No changes may be made to the engine that could reasonably be expected to increase its exhaust emissions for any pollutant. This includes changes
to the fuel metering system; changes to the ignition system; changes to the camshaft; and modifying, recalibrating, removing, or failing to properly
install any other specified component. The following requirements must also be met when installing this engine. Specifications for your engine are
listed at the end of the instruction sheet.
Gear Ratio
This engine may only be installed in a highway motorcycle or kit with an N/V ratio less than or equal to the N/V ratio given for your engine. The N/V
ratio is the engine RPM divided by the vehicle speed in miles per hour in high gear. This determines the maximum RPM of the engine for a given
vehicle speed in high gear. To find the N/V ratio for your application divide the engine speed by the vehicle speed while traveling in high gear. The
following table gives maximum RPM’s for the given speed and N/V ratio.
N/V Ratio Speed (mph) Maximum RPM
43.3 55 2382
43.3 60 2598
43.3 65 2815
43.3 70 3031
NOTE: This N/V ratio is equivalent to 1990-99 Harley-Davidson® FXD and FLH models with stock gearing and tire size.
Weight
This engine may only be installed in a highway motorcycle with a final weight that is equal to or less than the weight listed in the specifications for
your engine at the end of this manual.
Exhaust
The exhaust system used on the motorcycle must meet backpressure specifications. The total (stagnation) pressure must be in the range given in
the specifications for your engine found at the end of this manual. This measurement is taken 6.5” from the inlet of the front exhaust header with
the engine operating at 2000 RPM in neutral. The total stagnation pressure can be measured using a pitot tube facing into the exhaust stream and
a manometer that reads in inches of water.
Label
A unique label with the heading “Vehicle Emissions Control Information” is provided with the engine. This label contains the engine family
identification, engine tune-up specifications, and the serial number of your engine.
The label must be installed on the motorcycle frame or on a part that is permanently attached to the frame and the label must be located so that it
is visible with the seat removed.
NOTE: Clean the area where the label will be affixed before installing it. Once affixed the label is permanent and can not be removed without the label
being destroyed.