85 engine electrical.pdf - Vintage Snow

ENGINE ELECTRICALSystem 111- ElectronicsMR AdjustmentsFuel/air ratio at engine RPMs below 3500 can be adjusted Slightly richer or leaner from the standard programmixture by adjusting the MR control. This adjustment is to compensate for individual engine differences on Type Iand 1991 and 1992 Type II systems. This adjustment affects the same area as an air screw on a carboTo adjust the MR control, remove the rubber plug. Install the select monitor, power up the system and pressbuttons F-21 . A correct reading on the monitor is between 2 and 3, with 2.5 being the most desirable. NOTE: Athigh altitudes, a higher number will result in earlier drive-away after startup. Turning the MR screw clockwise willincrease the observed number and richen the mixture. Turning the screw counterclockwise will lower the numberand lean the mixture. The leanest setting will be 0 and the richest will approach 5.Type II System - 1993 To CurrentThe production setting is 2.5. Adjusting the MR control screw on 1993 to current model 500s will only affect coldstarts and cold drive-away. (It is designed to assist the driver when using poor or summer grade fuels.) If a leancondition is suspected, change the number to a higher value. If a rich condition is suspected, change to a lowernumber. Approximately two minutes after starting, this adjustment has little effect; after 10 minutes it has noeffect.Select Monitor ReadingsMode Description Normal ReadingF21 Mixture Enrichment 2.5MR Adjustments For Altitude And TemperatureThe following tables list MR screw settings for various temperatures and altitudes. Whenever performing MRadjustments, take the operator's riding location and weather conditions into account before making anadjustment. Numbers anywhere within the ranges listed should provide acceptable operation.Type I Systems - 1990 Through Current RxlsProduction Settings 2.5Ambient TemperatureBelow +20°F (-6°C)+20° to +50°F (_6° to 10°C)Above +50°F (10°C)0-3000 Ft. or 2.50-900 m3000-6000 Ft. or 3.0-3.5900-1800 m .6000-9000 Ft. or 3.5-4.51800-2700 m9000-12000 Ft. or 3.5-4.52700-3700 m3.0-3.53.5-4.04.0-4.54.0-4.53.5-4.53.5-4.54.54.5Type II Systems - 1991-1992 500 EFlsProduction Settings 2.5Ambient Temperature0-3000 Ft. or 2.50-900 m3000-6000 Ft. or 2.5900-1800 m6000-9000 Ft. or 2.5-3.51800-2700 m9000-12000 Ft. or 2.5-3.52700-3700 mBelow +20°F (-6°C)+20° to +50°F (_6° to 10°C)2.5-3.53.0-4.03.0-4.03.0-4.0Above +50°F (10°C)3.0-4.03.5-4.53.5-4.53.5-4.58/944.58