O.S.Engines 7B 26781008 Manual
Contents
1. 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 for a 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 necessary to close the Mixture Control Screw Do this by inserting a small screwdriver into the recessed screw on the right hand side and turning it clockwise About a quarter turn should be sufficient oT AEF LR amp EULT kt 3 FA FUL FSCOMAMMOARMBA E lt i EMMA kato TR ETOT uay Ahy AAS OMDB ON A At SH ela ESE Ey LEINS 4 any kein TOMIA L CRY YS lakih t l WPS HE DILL SECHMMA 2 DOMME 371 Ho TK AEN GE FI7 PERE OMMARho LINGALA Fa Tey OU HET Po CCH St MRL OEM amp HR HAH AME KA BAH ENCORE EF a TE Y O MIA zib bhd PAUL Y gt TER A TL amp OOP i EA FP OMS Errol EF GE TBBWxvFELSA it HT bv t OTL AIL o TLL AT CUMS Sb OD TFeuvix C amp eae ame v 7 d dir A Ae Sa gest SNTHVETOC VEV 77 HERL TZS TBARS te K ET ES e in CEPE amp amp DELAL aN aH EDE y TL s 4 rtk FIOM CH y TL 2 a F OpicAne OPE SEW COM Bitta FAK PL ESAS Ue AHERE ESZEDEN Et yr DLA f H ORR 7 BR 1 u Af u y Aa RIP YS ROLE NYA tYPR TSPeyvyy yk S ale RAP IN DOM L t IO oO 7 OPMlCADTOSGU F AT 7 7 wee GK IEE T ESD 2 w2. Au u bia a aN REPRO IESE GEOM AME BA HE OE TH 2 PA KIIREL THIS TAKES FREDET ANI Ati 4 OBO IE W EEE LPR ATT SE EKG MIL SA MOD PPAR OL ee dD A B Aky N Shit FHI RY FNE amp ET SDNL CT LORY aMLAMHFALD EIEN AW y peny AMEER AW y poba LRA Eo TRANH Minha Sash FORD AG sy bE rt Ok Yo SO WMA S A ET xv L nA 1 Ay bee OM Cee Ye ARL AN RiT sy Teh iS Ree TAMEL BoP e E Cee iaki ND KIL TERRE OD LM AS CR AE T OREO HEI OD Oi SE Fo 2 KIT A FANS T CEEE FA FD 7 CE CMOMME RIT EOE A0y bos y A PAIL LL 5 BINT 4 FU gt 7 CRM Ay bo A umes SMM LT HE To COM PAID SBA L GAG RMo na L Cll WEAR AWOTEMTSZRICLAS HAMART ECT EL PRLS CUE 4 KU gt 7 CSMORENET amp LORD MAT hohe MIL SMILED COMGIAT 1 FLAN SOL Te amp g Kad TRR A ie 4a 1 lha 45 90 EbLTC REY FA LIWE OL TOW bOI 2 HEIL 45 90 FO Zo TS REY E Aus bho 9 amp eS LANL ee Ye ANKLE OCT LEJA IK YH KAR rit Ce el CT 4 KU SMR ATK SET SHON BOM eT lt Few tlh FA FUSE TH hed RBM SMLA Lk IkKEs CLE DAY MRZI UO CHOGUOBFE ELJ DLN THEA LHP SRIACLASGHGM BAPE KS HH COMBA TKS 7 Alit Wil AIL EDL TCHR FA EMAL IOMBI EEDD Y y AMIEL CHF oT HEV BA BEROP 1 Cty kL Kase TONM EEZ TIZV ETA 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 maximum r p m On closing the throttle the eng
3. F OMALI LAL CT 4 KIII OL TOD e x CASARE bh h t KI di CURT AIA EDL Crd FeR T eB RH eT lt So 3 w 7 A AY LIA H FEIE TA KIL TOMS ARR a yW Tha 4 TA FLW OLTE LANDETO 2 AA b k DMR ey b LTR 5 OQI AT TeARIBILANTHS E y MHA a 7 A hrie RANTRE L ET 6 Fe 7L YIEE NPRM TCA a A IENDE ay TL yD Eit EPOR ADRE GET MBO ITOH amp MPP SOECT HEDHI CTI k 44 7 F OMM 2 DAMN eta SONS ARIAT RISHME BELTS Atty bh Sire 1 OLD amp INGER Ay be INO Re k IM UTC Hat LY Yo OWMAKBI kA ELTA TLE RSH TMA ITY WTF miy Yr Operas 2 PAY PATTIES SOS ETT b If instead of being set too rich the Mixture 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 about one half turn counter clockwise Mixture Control Screw adjustment is not critical and by remembering the symptoms of rich and lean running quoted above it is a very simple matter to establish the best setting I The Throttle Rotor Set Screw is for establishing the minimum 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 CARBURETTOR INSERT A muffler pressurised fuel system should be used with the Type 7B carburettor for best results If however ordinary suction fee
4. O S 7B8 5B 4BK 4D8 4ER y L 4 AZOy hI MRA INSTRUCTIONS FOR O S TYPE 7B 5B 4BK 4D amp 4E AUTOMATIC CARBURETTOR COX YH a ZO y hUi MTBBOUM SBM L TEREL AGRE AZAL AGBRLAK A ROTE PHRSR LURE TU R C MLEOA CORROMBEYRSILMEKET 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 main tained 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 YY VASA EPMO AM tO MET IORA EPA OIE OE OMG MORI Pets kN ATIE MSA HSN SDAI PRENET EAMG AO ROET amp PAHO tit LENT Y AE CUr 4 ae C Sos SOE MHAAOUG AZ bP A OMIWIL ROR EOE Pag Avy fer AGEL EDAN a ba y a AL CL PrP OWN Me BARS My Trey tt Amy hI y OOM i treo bh RODAF EOI ee lurve t tle YS AW KS OO EE PA tt AVES MSA k DIAM COT EV Fyrer ARPES SHO kt BL F AYEN RFE Ew AW hhe AEM LOAM eK eK Oe REY COMI OI ARJO Sinmi fe So Dll amp ee Mee A Ab p75 TANMEL TK Kw LOX TL YIN KOZ DOMBA DS AHO EH D Z KIND Zhit Matlh
5. d is to be used it is advisable to fit the carburettor insert which is supplied as follows 1 Unscrew rotor set screw and remove rotor 2 Remove the mixture control screw 3 Insert the carburettor insert into the throttle rotor throat 4 Reassemble carburettor 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 conditions 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 conditions 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 a ap OR PARTS LIST Description 7B Code No Ens 4BK Code No 4D Code No 4E Code No Carburettor Complete 26781008 25181009 24981029 25381006 25383000 Rotor spring 26781506 26781506 26781506 26781506 26781506 Throttle lever 26781402 26781402 24981405 24981405 24981405 Hex key wrench 26381548 26381548 26381548 26381548 26381548 X Throttle lever set screw 26381501 26381501 26381501 26381501 26381501 Api R
6. ine should idle at between 2 000 and 2 500 r p m and also run steadily at all intermediate speeds However different fuels and or climatic conditions may require minor readustments for optimum results P Jb N IL J N Needle Valve gee 1 Mixture Contr N BADI Y amp t MAX 60FSR 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 Valve recessed screw on right hand side 3 The Throttle Rotor Set Screw angled at rear of body L The Needle Valve is used in the same way as on all model engines i e for adjusting the high speed mixture strength Start 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 broken 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
7. otor set screw Assembly 26781619 26781619 26781619 26781619 26781619 Km x m 7 R Needle valve Assembly 26881931 24981930 26781938 24981930 26781938 y 7 L 7 mm ft E x Throttle fixing screw 25081700 25081700 25081700 25081700 Tv Carburettor gasket 22115002 22115002 22115002 22115002 0S I2 siy JII Fa T546 ARR REEKS 3 TE 6 HSS Baad LVS LO Aw Pie lt BOE a LAH ES The specification is subject to alteration for improvement without notice HEA Stt 06 702 O 2 2 5 ft GS ENGINES mrs coro 6 15 3 chome Osaka 546 Japan Imagawa Higashisumiyoshi ku TEL Osaka 06 702 0225
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O.S.Engines 7B 26781008 Manual