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11
Fault
Broken cooling fins, damaged threads or broken screw
at the exhaust port.
Seizure marks in the cylinder wall (especially at the
exhaust port).
Surfacecoating in the cylinder wall worn(mainly atthe
topofthecylinder).
Thepistonhasseizuremarks.
Thepistonringisstuckinitsgroove.
@Coverthecrankcaseopeningwithapieceofpaperora
cleancloth.Remove thecirclips andpushoutthepiston
pin.Cleanthepiston topfromcarbon.
@ K.rbelgehauseoffn.ngmiteinemTu.habdecken.
Seegerringabnehmen u nddenKolbenbolzen heraus-
drticken. R ussablagerungen aufderOberseite des
Kolbens wegkratzen.
@ Recouvrirl'ouvertureducarterdevilebrequinavecun
chiffon. D eposeIescirclips etextraire I'axedupistona
lapresse.Nettoyer lacalamine surIedessus dupiston.
@Cubrirlaabetiuradelc&terconuntrapo.Desmorrtarlos
anillos deseguridadyextraerel b ulondelpiston.Quitar
elhollindelapartesuperior delpistdn.
o
s Tackvevhusoppningen medentrasa.Demontera15s-
ringarna ochpressaurkolvbulten.
Rengorkolvens ovansidafr%sot.
@ Removecarburettorandsilencerandcleanthecom-
bustion chamberinthecylinder andtheexhaustport
fromcarbon.
@
VergaserundSchalldampferabbauensowieRuSSab-
Iagerungen am Zylinderkopf und an derAuslassoffnung
wegkratzen.
o F
D6poserlecarburateuret Iesilencieuxet nettoyerlacala-
mineclans laculasse et clans laIumiered'echappement.
@DesmontarelcarburadOr,elsilen~iadorYlimPiarde
carbonilla rotoenlaIumbrera deescape.
@ Demonteraforgasareoch l juddamparesamtren90r-
cylindertopp ochavgasportfr~n sot.
Remedy
Inserious cases -change thecylinder. Repair t hethread
Heli-Coil-inserts.
Grindthedamagedspotwitha fineemeryclothsothat
theadheredaluminum disappears.
Whendeeperseizure scratches occur,thecylinder and
pistonshouldreexchanged.
Exchange thecylinder andpiston.
Carefully grindthedamagedspotwithafinefileora
emeryclotch. B efore thepiston isreassembled,
thecylinder
shouldbegrinded, a sabove.Whendeeperscratches
occur,thepistonshouldbeexchanged andalsothe
cylinder, i fnecessary.
Loosen thepistonringcarefully andcleanthegroove
verycarefully beforereassembly. Checkthepistonring
forwearbyplacingitinthebottompartofthecylinder.
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