CSC TT250 - Page 78

TT250Owner’s andServiceManual
www.CSCMotorcycles.com
77

Rotatetheenginebyhandbyattachinga14mmdrivetothe
crankbolt.
Therearethreetimingmarksonthecrankshaftindicator
wheel.Oneisadoublescribelinethatshowswhenthe
ignitionisfullyadvanced.We’renotinterestedinthatone
forthevalveadjustmentoperation;this
informationis
includedhereforreferenceonly.
ThenextmarkisascribelinewithanF.Thisshowswhenthe
sparkplugfires.We’renotinterestedinthatmark,either,
forthevalveadjustmentoperation.It’smentionedherefor
referenceonly.
Here’sthemarkwe’reinterestedin.It’sa
scribelinewitha
T.Thatshowswhenthepistonisattopdeadcenter,which
iswherewewantittobeforthevalveadjustmentoperation.
YoushouldmanuallyrotatetheenginesothatthisTmark
andthescribelinearealignedwiththeslotandbothvalves

arefullyclosed.

Rotatetheengine’scrankshaftthroughthefull360degrees
atleasttwicetocheckvalveposition.Ononerotation,you
mayseethatoneofthevalvesisnotfullyclosed.Ifthat’s
thecase,DONOTadjustthevalveswiththeengine
crankshaftinthisposition.
Rotatetheengineanother360
degreestobringtheTmarkandscribelineintoalignment
withtheslotinthethreadedarea.Bothvalvesshouldbe