Valve Troubleshooting - Polaris 1999 Sportsman 400 Service Manual

116
I
Valve deposits
I
Valv e sti cking
I
Valve burni ng
I
Valve seat/fa ce wear
I
Valve damage
CliAPTER FOUR
VALVE TROUBLESHOOTING
Check:
Worn val ve gu ide
Carbon buildup fro m Inco rrect
eng ine tuning
Carbon buildup from Inc orrect
carburetor adjustment
Dirty or gum med fuel
Dirty engi ne oi l
Check:
Worn valve guide
Bent valve ste m
Depos its collected on valve stem
Valve burning or ov erheati ng
Check:
Valve sticking
Cyli nder head war ped
Valve seat distorted
Valve clearance Inc orrect
Incorrect valve sp ring
Valve spring wo rn
Worn valve seat
Carbon buil dup In engine
Engi ne ig nitIon and/or carbu retor
adju stments inc orrect
Check:
Valve burn ing
Incorrect valve cleara nce
Abrasive mater ial on valv e fa ce
and seat
Check :
Valve burning
Incorrectly ins talled or servi ced
valve guides
Incorrect valve cle arance
Incorrect valve, spri ng seat and
ret ainer assembly
Detonation caused by incorrec t
ign ition and/or ca rburetor
adjustments