CSC RX3 - Page 53

CSCRX3ServiceManual
www.CSCMotorcycles.com
52

Enginediagnosisprocedure:Poorengineperformance.
Poorperformance
Erectthemainstand,suspendthewheelsandrotatethewheelswithhands
Freerotationofwheel
Ins
p
ectthetire
p
ressure
①inspectifthebrakeisdragged
②Inspectifthewheelbearingisexcessivelywornor
damaged
③Inspectifthespacerbrushofwheelhubismissedorif
itisexcessivel
y
short
Inflexiblewheelrotation
Lowerpressure
Normalpressure
Inspectifthetirevalvecoreis
leakedandifthetireisbroken
Removethesparkplug,blockthesparkplugthreadholewithfingers,
pressstartbutton
Feeltheviolently‐pushinggasandhearthe
puff
Feelnoviolently‐pushinggas.Itmeansthecompression
pressureofcylinderisinsufficient
Normalcompressionpressure
Insufficientcompressionpressure
Starttheengine,slowlyaccelerate
andobservethechangeofengine
speed
①Inspectiftheexternaljointofenginehasany
leakage
②Inspectifthevalvetimingmechanismworks
properly.
③Inspectifthevalvelashisexcessivelysmall.
④Inspecttheairtightnessbetweenvalveand
valveseat.
⑤Inspectifthepistonringisfractured,
clampedintheringslot
orhaspoorelasticity
⑥Inspecttheabrasionofpistonringand
cylinder
Theengine
speedgoesup
withgreater
throttleopening.
Theenginespeeddoesnot
goupwithgreaterthrottle
opening.
Yes
①Inspectifthesupplyoffuelissmoothandifthefuel
pressureiswithin240‐250KPa
②inspectifthefuelfilter,theaircleanerandtheexhaust
silencerareblockedornot.
Inspectiftheignitiontimingis
correct.
No
①inspectiftheCDIigniterfailsornot
②Inspectifthemagnetorflywheelandthe
triggeringcoilareloosenedornot