Operating instructions
ENGINE ELECTRICAL
System
111-
Electronics
MR
Adjustments
Fuel/air ratio at engine RPMs below 3500 can be adjusted Slightly richer or leaner from the standard program
mixture by adjusting the MR control. This adjustment is to compensate for individual engine differences on Type I
and
1991
and 1992 Type
II
systems. This adjustment affects the same area as
an
air screw on a
carbo
To
adjust the MR control, remove the rubber plug. Install the select monitor, power up the system and press
buttons F-
21
. A correct reading on the monitor is between 2 and 3, with 2.5 being the most desirable. NOTE: At
high altitudes, a higher number will result
in
earlier drive-away after startup. Turning the MR screw clockwise will
increase the observed number and richen the mixture. Turning the screw counterclockwise will lower the number
and lean the mixture. The leanest setting will be 0 and the richest will approach 5.
Type
II
System - 1993
To
Current
The production setting is 2.5. Adjusting the MR control screw on 1993 to current model 500s will only affect cold
starts and cold drive-awa
y.
(It is designed to assist the driver when using poor or summer grade fuels.) If a lean
condition is suspected, change the number to a higher value. If a rich condition is suspected, change to a lower
number. Approximately two minutes after starting, this adjustment has little effect; after 10 minutes it has no
effect.
Select
Monitor
Readings
Mode
Description
Normal Reading
F21
Mixture Enrichment 2.5
MR
Adjustments For
Altitude
And Temperature
The following tables list MR screw settings for various temperatures and altitudes. Whenever performing MR
adjustments, take the operator's riding
location and weather conditions into account before making an
adjustment. Numbers anywhere within the ranges
li
sted should provide acceptable operation.
Type I Systems - 1990 Through Current Rxls
Production Settings 2.5
Ambient
Temperature
Below +20°F (-6°C)
0-3000 Ft. or
2.5
0-900 m
3000-6000 Ft. or
3.0-3.5
900-1800 m
.
6000-9000 Ft. or 3.5-4.5
1800-2700 m
9000-12000
Ft.
or
3.5-4.5
2700-3700 m
Type
II
Systems - 1991-1992 500 EFls
Production Settings 2.5
Ambient
Temperature
Below +20°F (-6°C)
0-3000
Ft.
or
2.5
0-900 m
3000-6000 Ft. or 2.5
900-1800 m
6000-9000
Ft.
or
2.5-3.5
1800-2700 m
9000-12000 Ft. or
2.5-3.5
2700-3700 m
8/94
+20°
to
+50°F
(_6°
to
10°C)
3.0-3.5
3.5-4.0
4.0-4.5
4.0-4.5
+20°
to
+50°F
(_6°
to
10°C)
2.5-3.5
3.0-4.0
3.0-4.0
3.0-4.0
4.58
Above
+50°F (10°C)
3.5-4.5
3.5-4.5
4.5
4.5
Above
+50°F (10°C)
3.0-4.0
3.5-4.5
3.5-4.5
3.5-4.5