f'G?\HONDA NUSO· NUSOM 4. FUEL SYSTEM TROUBLESHOOTING THROTTLE VALVE DISASSEMBLY CARBURETOR REMOVAL FLOAT/FLOAT VALVE/JETS DISASSEMBLY JETS/FLOAT VALVE/FLOAT ASSEMBLY 4-1 FLOAT LEVEL INSPECTION 4-5 4-1 CARBURETOR INSTALLATION 4-6 I 4-2 THROTTLE VALVE INSTALLATION 4-6 I 4-3 REED VALVE 4-8 i 4-3 FUEL FILTER AND TANK 4-9 10 I 4-5 I I SERVICE INFORMATION GENERAL ciJution when working with gasoline. Always work in il well·ventilated area ;Jnd 'lway from sparks or fjarnes. VVhen disassemblmg fuel system parts, nOtC the locations of the a·rings. Replace them with new oncs during assembly. Bleed air from the OJI outlet line whenever it is disconnected. 5PECIFICATlONS _ L:,enlUri __ r __ I' ! Identifrcation number r PA13E I Float , 12.2 ± 1.0 mm (0,48 -! 0.04 in) ! Ail' screw opening 2 turns Qut lelle spl1ed 1.800 ± 150 rpm I Throllie grip free play 2-6 mm 1118-1/4 in) TOOL Floin level Gauge 0740 I 10000 TROUBLESHOOTING Engine cranks but won'! start 1, No fuel in lank 2, Clogged lube 3. Clog(Jcd fllcl stri!!rW! 1. Too much fuel getting to cylinfJer 5. CI09!/cd ail' cleaner 6. F(lulty control box lean mixture 1. Carburetor fuel jets clogged 2. Fuel Cilp vent clogg\!d 3. Clogged fuel filter 4. Fuel line kinked (}r restricted 5. Float valve faulty 6. Float level tOO low 7. Air lIent tuhe clogged Engine Idles IO(l9hly, Of' runs poorly 1. Idle speed incorrect 2 Rtch t1)tXtllHl 3. Lean mixture 4. Clogged air cleaner 5. Inlet pipe leilking (:i. Fltcl contaminated Rich 1. Faulty float vallie 2. Float level 100 high 3. Carburetor air iets closs Daw of Issue: Nov .. 1981 ID HONDA MOTOR CO., lTD. 35 4-1
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f'G?\HONDANUSO· NUSOM 4. FUEL SYSTEM
TROUBLESHOOTING
THROTTLE VALVE DISASSEMBLY
CARBURETOR REMOVAL
FLOAT/FLOAT VALVE/JETSDISASSEMBLY
JETS/FLOAT VALVE/FLOATASSEMBLY
4-1 FLOAT LEVEL INSPECTION 4-54-1 CARBURETOR INSTALLATION 4-6 I4-2 THROTTLE VALVE INSTALLATION 4-6 I4-3 REED VALVE 4-8 i4-3 FUEL FILTER AND TANK 4-9 10I4-5 I
ISERVICE INFORMATIONGENERAL
ciJution when working with gasoline. Always work in il well·ventilated area ;Jnd 'lway from sparks or fjarnes.VVhen disassemblmg fuel system parts, nOtC the locations of the a·rings. Replace them with new oncs during assembly.Bleed air from the OJI outlet line whenever it is disconnected.
5PECIFICATlONS _L:,enlUri __ r__ I'! Identifrcation number r PA13EI Float
CARBURETOR REMOVALTurn the fuel vallie OF F and disconnect the fuel line,air venl tube, hvstarter tubes and oil out leI line tromlhe carburetor.
Remove the carburetor attaching nulS.
BYSTARTER TUBE
AIR VENTTUBE
FUEL LINE
OIL DUTLETLINE
FUEL SYSTEM
BYSTARTER TUBE
I
CARBURETORATIACHING NUTS
Remove the holts attaching Ihe rear fender.Relnove the ail cleaner bracket atlaching boilS andthe air cleaner with bracket.Remove :he carburelOr and disconnect Ihe dram tube'rom 11.
AIR CLEANER'L..-// 7"
BOLTS MOUNTINGBRACKET
FLOAT /FLOAT VALVE/ JETSOISASSEMBLYPlace a drain pan under the carburelOr and loosen thecarburetor dlain screw to allow tuel 10 drain in thedrain pan.Remove the float chamber from the carbu,elor body_
Oil,e 01 lnut: Nov., 1981EO HONDA MOTOR CO., lTD.
31 4-3
FUEL SYSTEM
HONDANU50·NU50M
Remove the carburetor float and lIoat valve byremoving the attaching screw.
Remove the float pin.
FLOAT/FLOAT VALVE INSPECTION
Check the valve seat for wear or damage.Check Ihe float for deformation or fuel inside thefloat.
Remove the air screw, record the number of rotationsuntil it seats lighllv, so it can be returned to theorlgimll position.
----,/){J 1101 force the screw agaillst its seQr 10
Assemble the rubber carburelOr cap and thrOlllelIill\'(' spring.
RUBBER SEAL,
CARBURETORCAP
/'THROTTLEVALVE SPRIN
FUEL SYSTEM
Connect the throttle cable \0 the throttle ...
Slide the throttle valve imo lhe carburetor body,
NOTE ----,
Align the groove in the valve with the throuleSlOp screw on the carburetor body.
Tighten the carburetor cap.Perform the following adjustments and operation:Throttle cable free play adjustment (Page 3·51Oil pump control cable adjustment lPage 3·61011 pump and line bleeding {Page 2·71Idle soeed :Jdiustment (Page 3·61.
Date of Issue: No..... 1981CD HONDA MOTOA CO., lTD.
THROTTLE CABLE
CAP
GROOVE
THp....TTl VALVE
4-7
FUEL SYSTEM
REED VALVEREED VALVE REMOVAL
Remove the carburetor (Page 4·3).
Oisconnect the bystarter lube from the intake pipe.Remove the intake pipe and reed valve.
NUSO·NU50M
BYSTAATER TUBE
INTAKE PIPE REED VALVE
REED VALVE INSPECTIONCheck the reed '1alve for damaged or weak reeds.Check the valve seat for cracks, damage or clearancebetween Ihe seal and reed. Replace the valve ifnecessary.
CAUTION:Do /lOt disassemble or bend the reed stopper.To do so can cause loss of power and t'nginedamage. If the sropper, reed or valve sear i.ffaulty, replace them as a unit.
REED VALVE INSTALLATION
The installation sequence is essentially the reverseof removal.Connect the bystarter lube to the intake pipe.After installation. check for leaks.