Exhaust System - Polaris 1999 Sportsman 400 Service Manual

78
greater) will actually decrease the
performance ofthe cooling system .
14 . Place a funn el into the radiator fille r neck and
refill the radiator and engine.
15. Slow ly add the 50% coolan t and 50 % distilled
w ate r mi xture throu gh the radiato r filler neck . Add
it slow ly so it w ill expe l as muc h air as possib le
from the engine anti radiator. Top off the coolant to
the bo ttom ofthe tiller neck. Do not install the radi -
ato r cap at this time .
16. Be sure to fill the sys tem eom plete ly. If the sys -
tem is completely drai ned, loosen the clamp (B,
Figure
66) o n the hose to the then nostat housing.
Pull the hose loose and fill the sys tem w ith coolant
at the radiator, while allowing air to escape from the
loosened
hose.
When
coo lant begins to flow from
the therm ostat and hose con nection, reattach the
hose and tig hten the clamp securely.
17. Squ ee ze the coo lant ho ses to purge air fro m the
coo ling system whil c filling w ith coolan t.
18. Remove the fill cap, then refi ll the coolant res-
ervoir to the FUL L mark , install the cap and tig hten
sec ure ly.
NOTE
Fill the cooling system
slov v
ly so the
coolant can expel the air
within
the
radiator and eng ine.
19.
Roc k the
ATV
a bo ut
20°
to the left and then to
the right several times . T his w ill help bleed
off
some of the a ir trapped in the cooling system. If'ncc-
essary, add additional coolant mixture to the system
un til the coo lant leve l is to the bo tto m of the filler
nec k.
20.
Install the radiator ca p (Figure 62) . Tum the ra-
diator ca p clockwise to the firs t stop. T hen push
down and tum
it
clockwise until it stops.
CA UTION
If the radiator cap is not installed ('or-
rectly , coolant loss and engine over-
healing will ocelli:
2 1.
Start the engine and run it at idle until it reaches
operating temperature. Make sure there are no air
bubbles in the coo lant and that the coolant level sta-
bilizes at the correct level. Addcoo lant ifnccessary.
22. Test ride the
ATV
and readj ust the coolant level
in the
reservoir if necessary.
CHAPTER T HREE
Exhaust System
1. Inspect the exhaust system for cracks or dents
that could
alter
performance.
2. Remove the
rear fender as described in Chapter
Fifteen.
3. Check the tightness of the muffler mounting
bolts (Figure 67) and the atta ching springs (Fig ure
6H).
4. Mak e sure the fro nt spri ngs (F ig ure 69) are se-
cure.