O.S.Engines 2CB Manual
Contents
1. 0 PAF ae BU x Mixture control screw 22481628 22481628 22781601 y J ML Nipple 22681953 22681953 22681853 ALWRItee RO ta Pi BC REMTSELEARHVEF The specification are subject to alteration for improvement without notice O S I yy 4 Jil fa eR OH 4t 7546 APRA RIESRSINZ TAS BIS WA 06 702 0O 225 1X O S ENGINES mrcco cro 6 15 3chome Imagawa Higashisumiyoshi ku Osaka 546 Japan TEL Osaka 06 702 0225 reserved Printed in Japan2. AC ED LCRBLT lt EAL EEEO 1 Ttek KIUL FDE EEA TIIE tho 3 TA K 2 SCORGAOARMBA E lt ADRA A o T ae TOT MED 22 Yur RUA CH Ye SUMING GH BLT HEY 4 Avy beet he Se LETE Yr DWED T I w Aking gE TRAE 2 OMB 41 OTL S GE TIJ RRF ED o H amp BREIT o TS EAL PMMA ye PEF ORED REEL DE RO DAOR E a AS wa dto AHN Sr oO PIED WAAL TL hat Oe TE o TMB 2 ie MARIAM ISMESRILL TK ZEN THEFT amp Mii iBS Fv TE R OBS HSMO THA 2 OAD ELEM CLK Te BR 2 RA aD CREE CO oTi ey On PE OMMRAKAL LAN PLOETER G Te BATA emini So DEARA KAD A bs Sa Soh RR EOE amp HR HEI LARRY TS BAR EN TOE EL FH TE RIESZ GbE WREKE EBE S gt 7 OMIT 4 ve OPEHLA te toes b Et You FA TL AKAT S AOE YN EMSA G RAL Zl GoOAMGIKOBM COM KR AIT oT Ha 1 Uy Ahya THY bh AOSMIRSEMN ET 2 u F amp RAS SHRIMN ES uy NMa ATUL THK oO TOKEFOCE SL EGWVEIMEDITICE ro 3 a A Geen rye a gt 4 ZKE beROIE PL AR 7 Kv ANALL T Reet Bein aicbry sR ale Son aiid createed Ue Aik A HENS LOT EU SALVO IE Myo oR FAIR gt 2s vases ha be C DAROED OMIE CHA AC lt EB Ey DAND MU ys EEO AS OSDO D D amp ORL APB OME amp bt CCH RU YY LORIE ABO S OWULO MD Wy ery ye TRIPA ILIASE AEH SAME AHO ETAL Fh Spk SACHA BAS PAR BAR EN TOS LOD HONE CHGAMLEPEL 5 Ker re Td bes WTO OM Dy rP paleo AWy bP AMA F 4 Fh Y RROME ILE MHOV ET ZEEL TIA SPF A Dk ERO D kZ ESO hulk amp bie a b If instead of being set too rich the Mix
3. CHEILGDNET Eo CFL 74 yhty TEL IY KRROL AK YADPUSREPAODC TL74 2 HRT LAER DIRE FS kILTI EATS FO GAB PRAE LCL Eo AMT KORINE bLAR y7 yD A TO CESOS Ay b VIF 1L RREN YE HTL I AREORA HCLE aritti m AbyS kOSZHTI F ete KLE COMRMCT I FLMC AMC NEDLIEES LOAETHUAAED GER COM D CHALIASETEL URE da CD FES A ta UO EHUN D 5RR ERE 7 XL Cle LAAT DEAE CRE AMIN S LYE HE JILTEMEL TREO TA EMBRAER LOM YS 1 xiko HoT EN SE Sv COFVFILA lld RON ZVNOMBBHMHWETS D Z KN EURIEK Ary hi a y ARE I t SE L RRO IER GHAR ABT SZAODNEO CH D Vo KIVA TAI EV THEORG HOMEL LM T ENS EEL PPCM Md APES HS LO HEA MILT A A ob OBR ee oL FCs 8 A B Akyst Ay hiba OBE SUM amp IML ET XH TLA OBS 1 evo Y VaR Ce GAY pK eK eI MEOMMOMG LMC LILA RNA Te ML ES He k Cae BBY OD Fb 2 Sob efi git ke CA 2 fic ait a BHO BE die Oi RS Ee EF 2 74 FLAN L CERME TA UY 7 TORR AOM KETO t Ay bb y Afke ACTA C MSRPINT A KU o 7TA y bLA SIL LTA ET COUR WAOS SARAL EZD oam T Wika EA DMWVIThHTSERITLAS REMATCH LEL PEEL OBRATA KU o ZOEN amp 10RD TF Zik EWL ET COMA T Ra eH tA 47 C F bHLTIC Hav GE amp AQ0ybhUA 4 OUPRe Bante len Ty Ly SEED CLEAMSM KERODI VO hY LTE E rE LUPT KUL TERY HRSEC RIOD HORORON Under average operating conditions the carburettor will normally function satisfactorily as factory set Simply start the engine in the normal way and adjust the needle valve for maxi mum r p m On closin
4. O S 2B 2CB D 2CK 4y 7UL4 ZDy LM Rat AS INSTRUCTIONS FOR OS TYPE 2B 2CB D amp 2CK AUTOMATIC CARBURETTOR COX AFLR ADybs BROUMRSBILICML CERELAMREAZL ALBRLAKL RZRERVI EY WRSMLUBIADS TEAC MDEOA CERROMBMRAIMEBRET This new carburettor incorporates an automatic mixture control device which ensures that the engine receives a correctly balanced mixture of fuel and air at all throttle settings The device progressively reduces the effective size of the fuel jet orifice as the throttle is closed thereby preventing the engine from running too rich at low speeds This also means that an airbleed is no longer required and with its elimination maximum suction is maintained at the fuel jet at all times This is a most important factor where manoeuvres have to be executed at low engine speeds and through wide variations of fuel level within the fuel tank Ty YUE RALARORG MI SOME DET CORR SRE OIE ENRAIAR OL EY me Y gt ATE MIE WSN DA HENEN EARAAO IM BAL PRED hit DENY YY AIR CMO TS ME CMR TA ED ET LCOKRGMOY Andy bro F OMMC ENR ENDE HR ARAA y beT LOPEL O Ay be PAL Tae ers te a ES CLOFHYTFLI lt AG pM F OLOWELEOTH ROPNE LOW Mic boch RORRATIE Y vA RS kI GRAE HEOIR DIS Nn A bE A COE LOY TE yte CHR EL THD Eta L LAS MHS N SARE AR RIFE ARETE EY EO aye A 8 ABEE ET FORE ORE CMR SN TAT Bg RHES 1 4 OIG Sit ay Th OMMBON oz Ae gt CWMHL TSC Haw AHL Fe 7 4 etplta KLEE FILME L SCP PREV AOKR AMRIT Eff Mt 4
5. g the throttle the engine should idle at between 2 500 and 3 000 r p m and also run steadily at all intermediate speeds However different fuels and or climatic conditions may require minor readjustments for optimum results Throttle Rotor Set Screw Lock Nut Needle Valve nxn Mixture Control Screw Photo shows carburettor FROT type 2B 2B NOTE In the event of the factory carburettor settings having been accidentally disturbed or otherwise interfered with provisional settings may be re established as follows 1 Release Throttle Rotor Set Screw Locknut and unscrew Throttle Rotor Set Screw just sufficiently to allow the throttle to close completely 2 With the Throttle Rotor set as above carefully screw in the Mixture Control Screw until it stops Do not force Mixture Control Screw beyond this point as its tapered tip may damage the fuel jet hole Now unscrew the Mixture Control Screw 1 1 2 turn from this point 3 If necessary fine tune the carburettor in accordance with the procedure explained below ADJUSTING THE CARBURETTOR Three adjustable controls are provided on this carburettor 1 The Needle Valve located on left hand side of carburettor 2 The Mixture Control Screw located on right hand side 3 The Throttle Rotor Set Screw angled at rear of body The Needle Valve is used in the same way as on all model engines i e for adjusting the high speed mixture strength Star
6. r to clean the filters periodically If despite the use of filters foreign matter should reach the carburettor causing it to malfunction it should be carefully dismantled and cleaned as follows 1 Remove complete carburettor from engine Clean off any external dirt 2 Remove throttle rotor set screw 3 Withdraw rotor from carburettor body taking care not to lose the rotor spring placed behind rotor 4 Remove needle from needle valve assembly followed by hexagonal retaining nut and ratchet spring Now push nozzle unit through body from outside 5 Remove fuel inlet nipple 6 Immerse parts in solvent e g gasoline alcohol or carbon tetrachloride and clean thoroughly 7 Re assemble in reverse order Note that periphery of nozzle flange is specially shaped to key into carburettor body Bo m PARTS LIST ae 5 3 K Code No da EA Description SCBD 20K Hy Fva HX Carburettor complete 22681005 22481040 22781010 R C KJLI L R C Needle valve assembly 22681908 45181919 22681908 MN Bf AbyN KX Rotor stop set screw assembly 22681306 22681306 22681306 RO yb beP Throttle lever 22681419 22481410 22781411 a 2 R2R 75 Vog Rotor spring 22481506 22481506 22481506 7 hL AE y k Throttle lever fixing nut 22481420 22481420 22781420 FEA A n ftat Throttle fixing screws 25081700 25081700 25081700 ry TL Ny EY Carburettor rubber gasket 22615000 22615000 2261500
7. t the engine and with the throttle fully open gradually close the Needle Valve until it is running at its maximum speed Caution Do not close Needle Valve to too lean a setting as this will cause the engine to overheat and slow up Set the Needle Valve very slightly to the rich side of the peak r p m setting Make sure that the engine is fully proken in about 1 hour of total running time in short runs before operating it continuously at full throttle l The Mixture Control Screw is for adjusting fuel mixture strength at part throttle and idling speeds Having set the Needle Valve as detailed above close the throttle The engine should idle continuously and steadily without further adjustment a If however the engine begins to idle unevenly open the throttle If the engine then hesitates before picking up to full speed it is probable that the idling mixture is too rich Check this by closing the throttle again and letting the engine idle fora little longer before again opening up If the engine now puffs out a good deal of smoke and hesitates or even stops it will be neces sary to close the Mixture Control Screw Do this by turning it clockwise about 10 20 degrees turn should be sufficient Copyright 1988 by O S Engines Mfg Co Ltd All rights ZAFT EEL BL PL KUL PP SHS ME SHC LKERILEDTLEDEAY BROKHSUTHAOZUBEH L4aOPSDLBNTMRYALATSLICULESBARYIT tC COB PI KIMBALL EV OKABICO EH LCRBGAPR lt K Go TUSPERBL EMS BR
8. ture Control Screw is set too lean the engine will stop when the throttle is closed or will lose speed while idling and then cut out abruptly without smoking when the throttle is opened again In this case turn the Mixture Control Screw counter clockwise about 30 degrees and make sure that the mixture gets rich then turn it clockwise gradually Mixture Control Screw adjustment is not critical and by re membering the symptoms of rich and lean running quoted above it is a very simple matter to establish the best setting lll The Throttle Rotor Set Screw is for establishing the mini mum idling speed If the engine runs too fast with the throttle closed the Rotor Set Screw should be turned counter clockwise to allow the throttle opening to be reduced SUBSEQUENT OPERATION AND CARE Once the required settings have been established it should be unnecessary to alter them Such slight needle valve alterations as may be necessary to cope with differences in atmospheric condi tions or fuels do not affect the other two adjustments The engine should start readily with the throttle in the idle position It is important that the carburettor operates under clean condi tions Make sure that fuel is properly filtered before use We advise fitting a filter to your fuel can and another filter in the delivery tube between tank and engine to reduce the risk of the carburettor jet becoming partially clogged and upsetting running adjustments Remembe
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O.S.Engines 2CB Manual