Displacement...............................................................................3.497cc
Bore.............................................................................................16.27mm
Stroke..........................................................................................16.75mm
Maximum.RPM............................................................................38,000rpm
Power..........................................................................................2.8hp@38,000rpm
Weight..........................................................................................464gr
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.
Ceramic.Piston.(XB).with.8-Port.Chrome-Plated.Brass.Sleeve.(Liner)
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. Aluminium.Piston.(XB-1).with.8-Port.Chrome-Plated.Brass.Sleeve.(Liner)
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.
Dual.Ball.Bearing-Supported.Crankshaft.and.Dual.Bushing-Supported.Connecting.Rod
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.
Three-Needle.Slide.Carburettor.and.Heat-Dissipating.Cylinder.Head
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.
7.5mm.and.8.5mm.Carburettor.Intake.Restrictors
P/N PT2008-XB
P/N PT2008-XB-1
Cylinder.Head
Carburettor
Assembly
Crankshaft
Fuel
Nipple
Throttle.Arm
High.Speed
Needle.Valve
Low.Speed
Needle.Valve
Due.to.manufacturing.changes.and.
improvements,.your.engine.may.
differ.slightly.from.that.shown.
Crankcase
Idle.Stop.Screw
Page
SH .21 XB AND XB-1 PRO COMPETITION OFF-ROAD ENGINE OPERATING INSTRUCTIONS
INTRODUCTION
BECOMING FAMILIAR WITH YOUR ENGINE
CAUTION - PLEASE READ BEFORE USE!
Thank.you.for.choosing.the.SH..21.XB/XB-1.PRO.Competition.Off-Road.engine..
All.SH.engines.are.designed.for.high.power.output.and.easy.handling.
The SH .21 XB/XB-1 PRO Competition Off-Road engines are designed specifically
for.1/8th.scale.off-road.racing.and.feature.competition-grade.aluminium-alloy.
parts,.a.ceramic.piston.(XB)./.Aluminium.piston.(XB-1).with.8-port.chrome-plated.
brass. sleeve. (liner),. dual. ball. bearing-supported. crankshaft,. three-needle.
slide.carburettor.with.7.5mm.and.8.5mm.intake.restrictors,.heat-dissipating.
cylinder.head.and.superb.attention.to.detail.and.quality..All.SH.engines.are.
manufactured.using.CNC.manufacturing.equipment.to.ensure.every.engine.is.
produced.to.the.exacting.quality.that.you.would.expect.from.an.engine.of.this.
caliber..SH.engines.offer.the.best.in.reliability,.power.and.cost.
SH.engines.will.consistently.give.you.dependable.performance.and.reliability.
and.will.be.a.source.of.satisfaction.and.pleasure.if..you.follow.these.instructions.
as.to.the.engine’s.proper.and.safe.use..You.alone.are.responsible.for.the.safe.
operation.of.your.engine,.so.act.sensibly.and.with.care.at.all.times..This.engine.
is.not.a.toy..It.is.a.precision-built.machine.whose.power.is.capable.of.causing.
serious.injury.to.yourself.and.others.if.abused,.misused.or.if.you.fail.to.observe.
proper.safety.precautions.while.using.it.
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Never use any fuel in your engine other than glow fuels specifically designed
for.use.in.model.car/buggy.engines..Use.of.any.other.types.of.fuel.can.cause.
severe.damage.to.the.engine.and/or.personal.injury.
NEVER usE gasoliNE/PETRol oR diEsEl fuEl!
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Never operate your model on any public streets. This could cause traffic
accidents,.personal.injury.or.property.damage.
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. Before.starting.the.engine,.make.sure.that.the.throttle.trim.is.set.to.the.idle.
position..Starting.the.engine.at.any.setting.above.idle.can.cause.the.model.
to.lurch.out.of.your.hands.
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. When.the.engine.is.running,.there.are.certain.parts.that.rotate.at.high.speeds..
Be.careful.not.to.touch.the.drive.shafts,.gears,.clutch.assembly.or.other.
moving.parts..Serious.injury.could.result.
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. It.is.normal.for.the.engine.to.get.very.hot.during.operation,.especially.the.
cylinder.head.and.exhaust.system..Never.touch.the.engine.or.exhaust.system.
while.they.are.hot.
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. Model.car.engines.produce.vibration.when.they.are.running..It.is.important.
to. periodically. check. the. engine. mounting. screws,. exhaust. mounting.
screws.and.other.assemblies.to.ensure.they.are.tight..Running.the.engine.
with.the.engine.mounting.screws.loose.can.lead.to.severe.engine.and/or.
chassis.damage.
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. Glow.fuel.engines.emit.exhaust.vapors.that.are.poisonous.and.can.be.
dangerous.to.your.health..It.is.important.that.you.operate.your.engine.in.a.
very.well-ventilated.area,.preferably.outdoors.
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Glow.fuels,.like.those.used.in.your.model.engine,.are.poisonous..Follow.all.
the.precautions.that.are.printed.on.the.fuel.manufacturer's.container.
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Keep.glow.fuels.out.of.the.reach.of.children...
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Glow fuels are extremely flammable. Keep glow fuels away from high heat,
sparks, and flame.
Please.read.through.these.operating.instructions.in.their.entirety.to.familiarise.
yourself.with.the.features.and.operation.of.your.new.SH..21.XB/XB-1.PRO.
Competition.Off-Road.engine..
Should.you.encounter.any.problems.with.your.engine,.we.have.included.a.
separate.Troubleshooting. Guide. with. these. Operating. Instructions. to. help.
you.solve.them..Please.use.the.photos.below.to.familiarise.yourself.with.the.
components.of.your.new.SH.engine...
Mid.Range
Needle.Valve
Exhaust.Port
