The. throttle. arm. angle. can. be. adjusted. to. better. suit. your. particular.
vehicle's. throttle. linkage. setup..
Using. a. 1.5mm. hex. wrench,.
loosen.the.grub.screw.at.the.base.
of.the.throttle.arm,.then.adjust.the.
angle. of. the. throttle. arm. either.
forward. or. backward. and. firmly.
tighten.the.grub.screw.
The.carburettor.is.held.in.place.using.the.pinch.sleeve.and.socket-cap.screw.
installed. in. the. crankcase.. Slide.
the.base.of.the.carburettor.into.the.
crankcase,. being. careful. to. keep.
the.carburettor.perpendicular.to.the.
front.of.the.engine..With.your.thumb,.
push down on the carburettor firmly
so the base of the carburettor fits
completely.into.the.crankcase.and.the.carburettor.O-ring.seals.the.gap.between.
the.two.parts..While.holding.the.carburettor.in.place,.GENTLY.tighten.the.socket-cap.
screw.with.a.2mm.hex.wrench.to.draw.the.pinch.sleeve.into.place.
The.idle.stop.screw.adjusts.the.closure.of.the.carburettor.barrel..The.idle.stop.
screw. should. be. adjusted. so. that.
the. carburettor. barrel. stays. open.
about.1/16".(1mm)..Turning.the.idle.
stop. screw. clockwise. will. cause.
the.carburettor.barrel.to.stay.open.
more..Turning.the.idle.stop.screw.
counterclockwise. will. allow. the.
carburettor.barrel.to.close.more..If.the.carburettor.barrel.stays.open.too.far,.
the.engine.will.idle.very.high.and.your.vehicle's.clutch.will.never.disengage..
If.the.idle.stop.screw.is.closed.too.far,.the.engine.may.die.during.idle.or.when.
you.engage.your.vehicle's.brakes..Ideally,.the.engine.should.idle.smoothly,.
yet.slow.enough.so.that.the.clutch.stays.disengaged.
WARNING
..The.socket-cap.screw.only.needs.to.be.tightened.enough.to.
keep.the.carburettor.from.turning.in.the.crankcase..Overtightening.the.
socket-cap.screw.can.cause.severe.damage.to.the.base.of.the.carburettor.
The.engine.does.not.include.an.exhaust.system..The.exhaust.system.is.typically.
designed.for.the.particular.car,.truck.
or. buggy. that. you. have. and. is.
generally. included. with. your. kit..
The.engine.is.designed.to.be.used.
with.a.tuned.pipe..To.extract.optimal.
power.and.performance.from.your.
engine,. we. strongly. suggest. the.
use.of.a.1/8th.scale.tuned.pipe.designed.for.the.powerband.that.you.desire..
The.engine.uses.a.standard.1/8th.scale.round.slip-on.header.held.in.place.
with.a.spring.around.the.cylinder.head..
fuel Recommendation
For the break-in period you should use a fuel specifically designed for R/C
car.engines.that.contains.no.more.than.20%.nitromethane.and.10%~14%.
oil.content..Once.the.engine.has.been.adequately.broken.in.(about.45~60.
minutes.of.run-time).you.can.switch.to.an.R/C.car.fuel.containing.up.to,.but.
no.more.than,.30%.nitromethane.and.10%~14%.oil.content..We.recommend.
using.XTM.Racing.or.Trinity.Monster.Horsepower.fuel.
WARNING
..We.do.not.recommend.using.fuels.designed.for.R/C.airplane.
engine.use..These.fuels.do.not.contain.the.proper.amount.of.lubricants;.
therefore,.they.will.cause.the.engine.to.overheat.or.run.erratically.and.severe.
damage.to.the.engine.can.result.
glow Plug Recommendation
The.glow.plug.can.make.a.big.difference.in.how.your.engine.performs..For.both.
the.break-in.period.and.normal.use,.we.recommend.using.a."cold".or."medium".
heat-range glow plug intended specifically for performance engines like the SH
Engines.#.5.or.the.SH.Engines.#.4..After.the.break-in.period.you.may.want.to.
use.a.different.heat-range.glow.plug..If.the.engine.has.a.hard.time.idling,.you.
may.want.to.use.a.hotter.glow.plug,.like.the.SH.Engines.#.3.
WARNING
. . Do. not. use. glow. plugs. intended. for. four. stroke. airplane.
engines.or.glow.plugs.with.an."idle.bar"..Using.the.wrong.type.of.glow.plug.
will cause the engine to run erratically and make it difficult to tune properly.
The.wrong.type.of.glow.plug.could.also.damage.the.engine.
If at any time the engine becomes difficult to turn over - STOP! The engine
has become flooded (hydro-locked) and the excess fuel must be removed or
damage.to.the.engine.could.occur..To.remove.the.excess.fuel.from.the.engine.
follow.the.steps.listed.below:
l
. Completely.close.the.high.speed.needle.valve.(turn.clockwise).until.it.
bottoms.out..
do this gently. don't force it!
l
. Remove.the.glow.plug.from.the.cylinder.head.
l
. With.a.rag.over.the.top.of.the.engine,.turn.over.the.engine.using.your.starter.
box.to.expel.the.excess.fuel.from.the.engine.
l
. Make.sure.that.the.glow.plug.has.not.been.fouled,.then.reinstall.it.
l
. Reset.the.high.speed.needle.valve.(turn.counterclockwise).3.full.turns.out.
from.bottom.(fully.closed).
IMPORTANT
..After.running.the.engine.for.the.day,.turn.the.crankshaft.so.
that.the.piston.is.at.bottom.dead.center..If.you.leave.the.piston.at.top.dead.
center,.the.piston.may.lock.in.place.when.the.engine.cools.down.
1mm
Grub.Screw
Socket-Cap.
Screw
Page
CARBURETTOR INSTALLATION
IDLE STOP SCREW
EXHAUST SYSTEM
THROTTLE ARM POSITION
FUEL AND GLOW PLUG RECOMMENDATIONS
WARNING ABOUT HYDRO-LOCKING
CARBURETTOR INTAKE RESTRICTORS
The engine features intake restrictors that you can use to fine-tune the power
output. of. the. engine..The. engine.
comes. stock. with. an. 8.5mm.
restrictor. already. installed. in. the.
carburettor..A. 7.5mm. restrictor. is.
included.separately..To.change.the.
restrictor,.remove.the.restrictor.by.
firmly twisting and pulling it out of
the.carburettor..Apply.a.light.coat.of.after-run.oil.to.the.o-rings.on.the.new.
restrictor, then firmly push it into the carburetor.
do not run the engine without
a restrictor in place.
