a Replacement Parts list, Troubleshooting guide, and Warranty information can
be found on the separate sheet packaged with your new engine. for service and
support in North america only, please contact us using the information below:
IMPORTANT
It.is.of.the.utmost.importance.that.the.engine.never.be.
leaned. out. too. much.. When. running. the. engine,. you. should. always. be.
able.to.see.a.faint.trail.of.smoke.coming.from.the.tuned.pipe..If.you.can’t,.
stop.the.engine.immediately.and.richen.the.high.speed.needle.valve.(turn.
counterclockwise). You should also make sure there is plenty of air flowing
over.the.cylinder.head.to.keep.the.engine.from.overheating.
After.your.engine.has.been.broken.in,.you.can.set.the.high.speed,.low.speed,.
and.mid-range.needle.valves.for.optimum.engine.performance.
WARNING
Be.careful.to.never.lean.out.the.engine.too.much..Remember.
that.the.lubricants.for.your.engine.are.suspended.in.the.fuel..If.you.lean.out.
the.fuel.mixture.too.much.you.will.also.be.lowering.the.amount.of.lubricant.
entering.your.engine..Less.lubricant.means.more.chance.of.your.engine.
overheating.and.possible.engine.failure.
setting the low speed Needle Valve
q
. Start.the.engine.and.adjust.the.high.speed.needle.valve.as.per.the.procedures.
above..Close.the.throttle.until.the.engine.slows.down.enough.so.that.your.
vehicle's.clutch.is.disengaged.and.the.wheels.don’t.turn.when.your.vehicle.is.
lifted.from.the.ground..Allow.the.engine.to.idle.for.about.10~15.seconds.
IMPORTANT
We. suggest. using. a. temp. gun. to. frequently. check. the.
operating.temperature.of.your.engine.during.use..The.optimal.operating.
temperature.is.between.230º.and.260ºF.(110º~127ºC)..Do.not.let.the.engine.
exceed.280ºF.(138ºC)..If.the.engine.exceeds.280ºF.(138ºC),.stop.the.engine.
immediately.and.re-tune.the.carburettor.to.a.richer.setting.
In North America:
Global Services
18480 Bandilier Circle
Fountain Valley, CA 92708
Phone: (714) 963-0329
Fax: (714) 964-6236
Email: [email protected]
SH.engines.are.distributed.exclusively.in.North.America.by.Global.Hobby.Distributors
All.contents.copyright.©.2008.Global.Hobby.Distributors..Version.1..January.2008
Page 4
FINE-TUNING YOUR ENGINE
q
. After.the.engine.has.been.running.for.about.10.seconds,.remove.the.glow.
starter.from.the.glow.plug..Advance.the.throttle.in.short,.quick.bursts.and.drive.
your.vehicle.for.about.2~3.minutes..If.the.engine.is.running.rich.enough,.you.
should.notice.smoke.coming.from.the.tuned.pipe.and.the.engine.should.sound.
like.it’s.running.very.rough..Also,.your.vehicle.will.barely.be.moving.because.
the.engine.is.running.so.rich.that.it.won't.produce.much.power..This.is.what.
you.want.for.now..If.there.is.not.smoke.coming.from.the.tuned.pipe,.richen.the.
high.speed.needle.valve.1/4.turn.(turn.counterclockwise)..After.2~3.minutes.
stop.the.engine.by.pinching.the.fuel.line.to.the.carburettor.
q
. Let.the.engine.cool.for.approximately.10.minutes,.then.restart.it..Set.
the.high.speed.needle.valve.mixture.to.a.slightly.leaner.setting,.about.1/8.
turn.more.in.(turn.clockwise)..Repeat.the.procedure.above,.advancing.the.
throttle.in.short,.quick.bursts.and.driving.your.vehicle.for.about.2~3.minutes,.
then.stop.the.engine.again.and.let.it.cool.for.approximately.10.minutes.
q
. Repeat.the.procedure.above,.leaning.the.high.speed.needle.valve.about.
1/8.turn.more.each.time..In.all,.you.should.run.the.engine.a.total.of.about.
45~60.minutes..After.45~60.minutes.of.run-time.the.engine.will.be.broken.in..
Run.the.engine.with.the.high.speed.needle.valve.set.slightly.rich,.but.lean.
enough.to.power.your.vehicle.adequately..At.this.point.the.engine.should.hold.
a good setting on the high speed needle valve and you can begin to fine tune
the.needle.valve.settings.to.increase.performance.
setting the High speed Needle Valve
q
. Start.the.engine.and.remove.the.glow.starter.from.the.glow.plug,.then.allow.
the.engine.to.warm.up.for.about.10.seconds.
q
. After.the.engine.has.warmed.up,.drive.your.vehicle.as.you.normally.would..
If.the.engine.seems.to.be.running.rich.(i.e.,.not.reaching.maximum.power),.
lean.the.high.speed.needle.valve.about.1/16.of.a.turn.(turn.clockwise).at.a.time.
until.the.desired.setting.is.achieved..Always.make.sure.that.you.run.the.engine.
slightly.rich.-.you.want.to.be.able.to.see.a.faint.exhaust.trail.at.all.times.
IMPORTANT
To. get. more. power. from. your. engine. you. can. use. fuel.
containing.up.to.30%.nitromethane..We.must.caution.you.though,.that.once.
you.run.the.engine.with.increased.nitro.you.may.not.get.satisfactory.results.
if.you.decide.to.go.back.to.a.lower.nitro.content.
q
While holding your vehicle off the ground (making sure to keep your fingers
away.from.the.moving.parts),.quickly.open.the.throttle.in.a.short.burst...If.the.engine.
just.stops.running.as.soon.as.the.throttle.is.advanced,.the.low.speed.needle.valve.
is.too.lean.and.the.engine.is.not.getting.enough.fuel..With.the.engine.stopped,.
richen.the.low.speed.needle.valve.about.1/16.of.a.turn.(turn.counterclockwise)...
q
. Restart.the.engine.and.repeat.the.procedure.above.until.the.engine.will.
transition.smoothly.and.quickly..Very.slight.hesitation.in.the.transition.is.normal.
q
. If.you.quickly.advance.the.throttle.and.the.engine.seems.to.be.very.rich.
during.transition.(i.e.,.lots.of.smoke.coming.from.the.tuned.pipe.and.very.rough.
sounding),.the.low.speed.needle.valve.is.too.rich.and.the.engine.is.getting.too.
much.fuel..With.the.engine.stopped,.lean.the.low.speed.needle.valve.about.
1/16.of.a.turn.(turn.clockwise).
q
. Restart.the.engine.and.repeat.the.procedure.above.until.the.engine.will.
transition.smoothly.and.quickly..Very.slight.hesitation.in.the.transition.is.normal.
setting the Mid Range Needle Valve
q
. Start.the.engine.and.adjust.the.high.and.low.speed.needle.valves.as.per.
the.previous.procedures..Turn.the.mid.range.needle.valve.in.no.more.than.
1/8th.of.turn.incremenets.to.adjust.the.engine's.mid.range.transition..If.the.
engine's.mid.range.is.rich,.lean.the.mid.range.needle.valve..If.the.engine's.
mid.range.is.lean,.richen.the.mid.range.needle.valve..
do not adust the mid
range needle valve until after both the high and low speed needle valves
are properly adjusted.
q
. Now.drive.your.vehicle.as.you.normally.would.for.a.while.to.get.a.feel.for.
how.the.engine.reacts.to.throttle..Now.that.you.know.the.proper.way.to.tune.
the.engine,.you.can.make.slight.adjustments.to.the.carburettor.until.you.are.
satisfied with the performance.
l
After you are finished running the engine for the day, pinch the fuel line to
stop.the.engine..This.will.allow.the.engine.to.burn.any.excess.fuel.out.of.the.
crankcase..Remove.the.glow.plug.from.the.engine.and.squirt.several.drops.
of.after-run.oil.into.the.glow.plug.hole.and.the.carburettor.opening..Turn.the.
crankshaft.several.times.to.distribute.the.oil.throughout.the.engine,.then.
reinstall.the.glow.plug.and.copper.washer..The.after-run.oil.will.prevent.the.
inside.of.the.engine.(especially.the.crankshaft.bearings).from.rusting.
l
Check.the.engine's.cylinder.head.bolts.and.backplate.screws.after.each.
day.of.use.to.ensure.that.they're.tight..This.will.prevent.air.leaks.from.causing.
erratic.engine.performance.
l
.After.running.the.engine.for.the.day,.turn.the.crankshaft.so.that.the.piston.is.
at.bottom.dead.centre..If.you.leave.the.piston.at.top.dead.center,.the.piston.
may.lock.in.place.when.the.engine.cools.down.
ENGINE MAINTENANCE AND SERVICE INFORMATION
