Polaris 1999 Sportsman 400 Service Manual page 220

214
V-belt
Drive pulley
Low speed
CHAI'T ER EIGHT
•
Driven pulley
High speed
Driven pulley
load resistance increases. such as when going up-
hill, the pulleys change the reduction ratio; engine
speed will remain nearly the same, but the vehicle's
speed will drop. When the load decreases, the pul-
leys automatically shift toward a higher ratio; en-
gine speed remains the same but the vehicle's speed
will
increase .
The Engine Braking System (EBS) was incorpo-
rated into the clutch dri ve unit on all models pro-
duced since 1999. This sys tem has a unique feature
that allows engin e braking to occur when the vehi-
cle is coasting or going
dov. . . . .
nhill. Engine braking
occurs when the forward rotational speed of the
one-way clutch within thedriveclutchassembly ex-
ceed s the speed of the engine and the drive clutch.
At this po int the one-way clutch locks to the drive
clutch shaft and becomes the driving clutch. Enginc
braking will conti nue until the drive clutch speed
exceeds one-way clutch speed. or until the throttle
is applied and eng ine speed reaches clutch
engage-