NGH GF30 - Carburetor Setup and Adjustment; Carburetor Setup Procedure; Factory Setting Status; Carburetor Adjustment Guide

2
Carburetorsetupandadjustment:
NGH-GF30
four-stroke
gasoline
engine
used
Walbro
WT
carburetor
is
designed
for
NGH
unique.
It
has
the
perfect
stability
of
idle
speed
and
acceleration
sensitivity.
It's
better
to
remove
fuel
from
the
carburetor
after
a
set
of
fl
ight
to
avoid
carburetor
rubber
components
deteriorating
over
time,
which
may
lead
to
engine
performance
failure.
Methods:
Start
engine
without
connecting
the
fuel
pipe
until
all
fuel
oil
in
the
carburetor
exhausted.
SetupCarburetor:
①—Choke： Closeitbeforethefirststarttheengine,andquicklyrotatingpropeller,thefueloilsuctionwithinthetank
intothecarburetor,whenyoustarttheengineshouldbeopenit.
②—Thethrottlecontrolarm： Infinitelyadjustable-speeddevice,controltheturningspeedoftheengine.
③—Nozzle： Connecttheoiltankandsupplythefueltoengine.
④—Highspeedneedle(H).： Afterfullyopenthethrottlecontrolarm ②,adjustthehighspeedneedlecangetthebest
highspeed.
⑤—Idlingspeedneedle(L)： Put ② returntotheinitialposition,adjusttheidlingspeedneedlecanobtainsatisfactory
lowspeed.
⑥—Idlemixtureadjustmentscrew： Adjustingthefuelandairmixingratioatidle,itactuallycontroltheinitial
positionof ②,adjust ⑥ and ⑤ willobtainthebetteridlingspeed.
Theinitialsetupofthecarburetorisfactorysettings,theenginefirststartdon’tneedtoadjust.
Thefactorysettingstatus:
④—Highspeedneedle,Fullyclosed(clockwise)beforeexiting(anticlockwise)1.25-1.5rings；
⑤—Idlespeedneedle,Fullyclosed(clockwise)beforeexiting(anticlockwise)1.5-1.75rings；
⑥
—
Idlemixtureadjustmentscrew,Thethrottlecontrolarmattheotherendofthelimitpawlnearthescrewconeabout
0.6mm.
AdjustCarburetor:
Whentheenginerunning,youwanttoadjustthecarburetor,pleaseadjustitbasedonfactorySettings:
Intheprocessofadjustingthecarburetor,pleaseuseahigh-qualitytachometertodetermineyouradjustedresults,the
tachometeryouneedtobuyone.
Firstadjustthehighspeedneedle:Engineruntimewillbeturnedonatfullthrottleposition,adjustthehighneedleand
watchthechangeofthetachometer,maketheenginerpmreachthemaxperminute.Engineworkinastablehighspeed
(pleasenote:donotlettheenginerunboundaryforalongtime,thisisabigdamageforengine).
Adjusttheidlespeedneedle:Thethrottlereturntotheidleposition,adjusttheidlespeedneedleandwatchthechange
ofthetachometer.Lettheengineruninastablestateofidlespeed(Advice17x8woodenpropelleridlespeedat
1800rpm).
Whennecessarytheidlemixtureadjustmentscrewjointadjustmentstoensuretheengineidlespeedstability,smooth
acceleration;Iftheengineisidlingstartdifficult(ExcludeCDIignitionpowershortage,excessivefuelcombustion
chamber,sparkplugproblemsandsoon).Thisshowsthatair-fuelratio(A/F)islowatidling,pleaseadjustidlemixture
adjustmentscrew,increaseairratio,oradjustidlingneedletoreducetheamountoffuel,A/Fratiotoachieve
appropriateproportion.(Tip:Thelargerenginepropeller,themoreperfectloweridlespeedyouwillget.)
Whentheenginehighspeedandidlespeedadjustmentiscompleted,trytoruntheengineaccelerationperformance.
Firstlettheenginetorun10secondsatidlingandthequicklymovethethrottlecontrolarmatfullthrottleposition,
therewillbethefollowingthreesituations:
A.Enginespeedisresponsiveandsmoothtransitiontothehighestspeed,instructionsfortheadjustmentoftheengineis
verygood.
B.Engineaccelerationhasacoughperformance,graduallytransitiontothehighestspeed,illustratetheidlespeed
needlesetrelativelyrichoil,theidlespeedneedletomakeasmalladjustment(clockwiserotation),andthentryagain,
trytoacceleratethereactionconstantadjustmentuntiltheenginereachesyourrequest.
C.Rapidthrottlewhentheenginesuddenlystoppedrunning,thisshowsthattheidlespeedneedlesetrelativelyleanoil,
theidlespeedneedletomakeasmalladjustment(anticlockwiserotation),andthentryagain,trytoacceleratethe
reactionconstantadjustmentuntiltheenginereachesyourrequirements.