CSC RX3 - Valve Adjustment

CSCRX3ServiceManual
www.CSCMotorcycles.com
45
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Reinstallbothoilfillcaps(theonewiththeslotandtheonewiththeextensionforturningbyhand).
Startthemotorcycleandletitrunforacoupleofminutes,andcheckforleaks.
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CSCMotorcyclescanprovideyouwitheverythingyouneedtochangeyouroil,including
recommended 
regularandsyntheticoil.Weofferacompleteoilchangeservicepack.Callusat9094450900toorder
theseitems.
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ValveAdjustment
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CSCrecommendsinspectingthevalvegapat500miles,andadjustingthevalvesevery5000miles.Ifthe
motorcycleisriddenaggre ssively orathigh
rpmforextendedperiods,youmayneedtoincreasethe
valveadjustmentfrequency.
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TheCSCRX3hasahighperformance,singleoverhead
cam,4‐valveengine.
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Therearetwoexhaustvalvesandtwointakevalves.
TheCSCRX3hasasinglecamshaftwithtwolobes,
andtworockerarms.
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One
rockerarmactuatesbothintakevalves;theother
rockerarmactuatesbothexhaustvalves.Thecam’s
lobesarewhatactuatetherockerarms.Asthecam
lobeliftstherockerarm,therock erarmpivotsonits
shaft.Therockerarmhasonearmthatfollowsthe
camlobeupand
down,andtwoarmsthatactuateits
twovalves.Theengineopenstheintakevalvesto
admitthefuel/airmixture,anditopenstheexhaust
valvestoexpeltheexhaust.
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Whentheengineisatthetopofitscompressionstroke,allofthevalvesareclosed.Thisallowsfor
compressionofthefuelairmixture,igni tion,andtheresultinghighcombustionpressures willdrivethe
pistondown.
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Ifanyleakageoccursaroundanyofthevalveswhilethisis
occurring,theenginewilllosepowerandit
could“burn”avalveifthecombustingfuel/airmixescapesaroundthevalvewhileitisstillburning.
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Whenengineersdesignanengine,theywantittodotheabove,buttheyhavetoaccountforthe
thermalexpansionthatoccursas
enginetemperatureincreasesduringnormaloperation.Inorderto
compensateforthisthermalexpansion,theengineersdesigninagapinthecamlobe/rockerarm/valve
train.Astheenginewarms,thisgapapproacheszero,andeverythingworksthewayitissupposedto.
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Thevalvescloseagainstthevalveseat
everytimetheygoupanddown.Asthevalvepoundsagainst
theseatwhentheengineruns,verysmallamountsofdeformationoccurinboththevalveandthevalve
seat.It’smicroscopic,butitgrowsovertimeastheengineruns.Asthiswearincreases,ithasthe