Operating instructions
Contents
1. Use up all fuel that was produced as a mixture with the oil we recommend the MOBIL Racing 2T From now on fuel and oil should be mixed in the proportion 40 1 DO NOT PROCESS THE RUNNING IN AT IDLE SPEED You should get following results if the engine is settled up and in run correctly Propeller 261FS APC 16 12 7300 7400 3266 APC 16 10 8100 8300 3266 Mejzlik 18 8 8100 8200 3266 7200 7300 3270 These values are only approximate and may vary with the factors described in the previous section as well as with the type of the exhaust system used Possible faults of the engine and how to dispose those If the engine does not start check and possibly replace the spark plug check the spark put the plug into the cable end and by turning the engine you ll see the necessary spark Note The plug must touch a metal part of the engine check fuel lines check for proper mechanical function by turning the engine over check that carburetor s nozzles are adjusted correctly remove the carburetor cover from the feed side check the filter and blow off carburetor with compressed air Caution When using compressed air use eye protection When re assembling be careful of maintain the proper order of the components check the vacuum feed line Mechanical faults if the engine can not be turned over easily must always be handled by a professional service department Service suggestions After each 202. Serial Number Dealer Buyer s name and address Produced by MVVS spol s r o t Kpt Jaro e 35 60200 Brno Czech Republic Ph 420 545 211 683 fax 420 545 211 418 E Mail mvvs mvvs cz Http www mvvs cz
3. Operating instructions MVVS 26 IFS 3094IU MVVS 26 IFS SP 3094SP Version 1 10 Before using the engine carefully read these instructions Congratulations on choosing the gas engine MVVS 26 ccm MVVS 26 has been designed and manufactured for propeller powered radio controlled model planes It is able to meet all of your expectations of an acrobatic racing engine Technical specifications 3 8 PS 9000 RpM 3 1Nm 8000 RpM Weight of complete 936 g Fuel Unleaded 95 octane fuel engine without ignition Weight of ignition unit 165 g Oil with petrol in mixture 1 40 RpM range 1400 9500 fo o O The value in the table above stands for the weight of a completely assembled engine including the spark plug carburetor drive washer and prop screws Power output varies with the exhaust used The value given in the table stands for the maximum available power output Engine s dimensions t Safety precautions 1 Never use the engine for any manned vehicles 2 When operating model planes always follow the rules and laws in effect in your country 3 The manufacturer declines all responsibility for all damages arising from the operation of models and other appliances droved by MVVS engine 4 Always use original spare parts 5 Never tamper with the engine construction 6 Before each flight check that all the propeller screws are tightened up and in good condition If you use a spin
4. Thermo isolation washer 10501 Cylinder head N0501 Cylinder head 26 SP 0502 Cylinder head screws set 0503 Cylinder head gasket 0601 Cylinder sleeve N0650 Cylinder piston ass 0701 Piston 0702 Piston ring 0801 Piston pin N1001 Crankshaft 11101 Drive washer 1102 Drive washer ke 1103 Propeller nut 1106 Drive washer shim 3224 Walbro Carburetor 1321 Carburetor flange 1305 Carburetor flange gasket 2pcs g 1307 Carburetor screws 2pcs 1308 Nuts 2pcs 1309 Nut s washers pes 1405 Ignition sensor fixing screws a 3314L Electronic ignition unit ICU L 3309 Spark plug 0802 Piston pin circlips _3227D 26 Diffusor 26 SP Warranty The MVVS gas engines come with a three year guarantee against defects in workmanship and materials Only original buyers of the engines are eligible warranty claimants The warranty cannot be transferred with a change in ownership This guarantee does not cover any normal wear that might occur damage arising from accidents damage arising from the use of an unbalanced or damaged propeller damage arising from the use of a too small or a too big propeller damage arising from the use of low quality fuel damage arising from the use of other than original spare parts and accessories damage arising from sucking a foreign object into the engine damage arising from any improper use Certificate of Warranty Date
5. e engine 2 turns following the instructions in paragraph 1 above Then proceed according to instructions given in paragraph 2 3 If the engine does not start even after another set of turns open the choke valve and the throttle to maximum and give the engine approx 4 turns Switch the ignition off and on again and restart the engine with throttle turned slightly down and the choke valve set open 4 If the engine still would not start unscrew the plug and check its contacts Clean any possible petrol moisture i e an indication of engine overflow and screw it in again Further starting should only be done with the throttle turned down If the plug is dry then probably not enough fuel has been drawn into the carburetor If that is the case check the fuel feed and then return to the instructions given in paragraph 1 Having started the engine leave it running for about 5 minutes at a higher idle speed Then run it in for about 10 min while changing revolutions from idle to 1 2 3 4 of the range and shortly holding each position gradually prolong the holding periods After 10 minutes of operation open the throttle at maximum for a period of about one minute At this point stop the engine and let it cool down Then restart it and check the adjustment If everything is all right you can first take off During first few flights do not overload the engine and do not let it run at high revolutions for long periods of time very important at hot weather
6. hours of running or year change the spark plug After 100 hours of operation time commit the engine to the professional service department for check up Re assembling These operations are very complicated and it is not recommended to do it on your own Please commit to professional service Possible guide instructions we publish are as follows Demount rear cover head and carburetor It is not possible to re assemble the engine unless the cylinder part of the engine is heated up to 80 100 C Then it is possible to remove steel piston insert without rotating Next step is piston and connecting rod removal Crankshaft has to be in the top dead centre TDC Pull off the connecting rod from pin on the crankshaft in direction to rear cover out of the crankcase After getting off the drive washer and Woodruff safety key it is possible to pull out the crankshaft again in direction to rear cover out of the crankcase You will get the bearing out after heating up again between 80 100 C Assembling passes off in opposite meaning Spare parts list E 1308 aa 1309 1307 Tt 9502 No Description Nor Description NO101 imino N0951 0202 Front bearing 0203 Rear bearing 0301 Rear cover 0302 Rear cover screws set E 1104 Propeller washer 0304 Pressure nipple 0306 Rear cover O ring 0403 Sealing ring 0404 Carburetor screw Carburetor flange E 1310
7. inutes more If the engine does not respond to acceleration fast enough keep closing the L needle until the engine starts to cut out in response to throttle opening At that point reopen the L nozzle by 5 10 minutes Step IV If the engine reacts correctly set it at full speed If revolutions do not drop the engine has been adjusted successfully If revolutions seem to drop open the adjusting needle H by about 5 10 minutes Caution The engine must be stopped while you adjust the carburetor in order to prevent injury by the propeller Starting and running in a new engine Before you first start the engine make sure that the plug is screwed in and tightened up and that the plug socket is fitted in place and fastened down properly Fix the ignition sensor in proper position above the magnet with screws enclosed Unless the spark plug is inserted in plug socket never turn the engine with ignition turned on This could lead to ignition damage 1 Make sure that the ignition is switched off the choke valve is closed and the throttle valve is about half opened Then give the engine 3 4 turns provided that carburetor is not overflowing If it is overflowing only give the engine 1 2 turns 2 Switch the ignition on close the choke valve set the throttle at slightly higher idle speed and give the engine a few quickly turns If even after the fourth turn with the choke valve closed you do not hear a suggestion of the engine starting give th
8. ler Always replace the propeller when damaged 18 Make sure that no part of your body intersects the plane of the spinning propeller 19 Always wear close fitting well fastened clothes when starting or operating the running engine Never wear loosely hanging clothes ties scarf etc 20 Never try to stop the engine by any part of your body 21 Always stop the engine either by turning off the ignition switch or by completely closing the carburetor throttle valve Selecting a suitable propeller It is usually the case that propellers of the same dimensions coming from different manufacturers are not the same Oftentimes not even propellers of the same dimensions produced by a same manufacturer are not the same The engine power is best utilized when the propeller dynamics curve and engine power curve revolutions power output intersect in the area of the engine top power output Unfortunately no propeller manufacturer provides this information Engine power output is also a variable quality It depends above all on the silencer used and can considerably vary The situation is further complicated by environmental parameters temperature and atmospheric pressure in particular low temperature and high pressure increase propellers input requirements by 20 in comparison with input at hot weather MVVS 26 has been designed to generate maximum power at 8500 RpM according to the type of exhaust used If you wish to utilize the maximum power
9. ner check that it is tightened up too When mounting the spinner always follow the assembly instructions 7 Before each flight check that all the propeller screws are tightened up and in good condition If you use a spinner check that it is tightened up too When mounting the spinner always follow the assembly instructions 8 Before starting the engine always make sure that the model is safely fixed in place and cannot start moving 9 Fuel is combustible and therefore must be kept in an enclosed container at a safe distance from the engine when it is running 10 When preparing fuel carefully follow the manufacturer s or dealer s instructions 11 Small objects must be kept at a safe distance from the engine when it is running Never throw any objects towards the spinning propeller 12 Be careful in choosing the location where you wish to start the engine Avoid dusty or sandy areas 13 Start the engine in well ventilated areas only Never start the engine indoors 14 When starting the engine make sure that bystanders especially children are at a safe distance of at least 10 meters 15 The engine power output makes it possible to fly big models Mal operation of such models may cause serious damage Start using the MVVS 26 in model planes only after you have mastered operating smaller models 16 Periodically check that the engine is firmly fixed to the engine mounts Never start a loose engine 17 Always use a balanced propel
10. ounting the engine in the model use seals to protect all openings and prevent the pollution of the engine s inside with sawdust residual abrasives etc Exhaust Use only factory made exhausts pipes designed for this type of engine preferably brand name MVVS engines with which you also get the power output guaranteed The manufacturer declines all responsibility for all engine damages arising from the use of improper exhaust systems When mounting the exhaust follow the manufacturer s instructions Make sure to secure sufficient cooling of the exhaust 3270 compact medium level of power output 3266 tuned pipe with adaptor 3265 provides the highest power output with the flat torque curve useful for the model planes 3266 3270 3265 Carburetor adjustment Basic setting adjusting needle L for low RpM range 1 turn and 50 minutes for WT 793 adjusting needle H for high RpM range 1 turn and 35 minutes Minutes refer to hands of a clock Walbro WT 793 Choke Pressure pulse inlet The new engine comes adjusted to the basic setting After the engine has been run in adjust it following the instructions below start the engine and warm it up let the engine run at idle speed for approx 5 seconds Step I Accelerate to 2 3 of the throttle range within approx sec faster acceleration Repeat three times if the engine accelerates quickly and without a hiccup go to Step III If acceleration is not
11. output choose a propeller which allows the engine to reach these revolutions or slightly lower revolutions given the unloading of the propeller depending on the speed of flight on the ground We do not recommend using propellers with which the engine reaches more than 9000 RpM on the ground Suggested propeller dimensions 16x8 16x10 16x11 16x12 17x8 17x10 17x 12 18x8 Fuel Always use unleaded 95 octane petrol mixed in the proportion 40 volume units of petrol to 1 unit of Mobil Racing 2T oil If necessary quality brand name synthetic oil intended for racing two stroke engines can be used too Mix it in the proportion 30 1 Never use inexpensive oil developed for garden appliances or synthetic oils intended for the operation of methanol model engines The manufacturer declines all responsibility for all engine damages arising from the use of low quality fuel Store fuel in containers designed for this purpose Do not use mixed fuel older than 90 days Assembly Since air is used to cool the engine sufficient air circulation under the cowl must be ensured Never forget about a hot air outlet which must be bigger than the intake Gas engines heat up to a much greater degree than methanol ones Do not forget that the engine needs oxygen from the air to be able to operate Therefore ensure access of air to the engine intake as well Caution intake of warm air from beneath the cowl may cut the engine power output Caution When m
12. smooth go on to Step II Step II Faulty acceleration with hiccups and a tendency to cut out is usually attributable to a poor fuel mixture in the medium revolutions range Stop the engine and recheck the fuel feed the hose pipe must not be pinched or broken if fitted check also the fuel filter permeability Restart the engine and test acceleration again If problems persist adjust the carburetor Open the adjusting needle L by 5 min and retest acceleration If acceleration is smooth open the needle by another 3 5 min this should be done because the needle was previously set at a boundary value if atmospheric conditions changed during flight the problems might recur If the engine continues to not accelerate properly open the low speed needle by 10 minutes If the engine s operation does not improve shut it off and check the basic setting Set the adjusting needle L at 1 turn and 50 min and the adjusting needle H at 1 turn and 10 min restart the engine and test the acceleration If the engine runs correctly go to Step III If it continues to not accelerate properly open the low speed needle by another 10 minutes If acceleration is faulty the defect is likely to lie somewhere other than an adjustment Step ITI If the engine accelerates correctly according to the above test set it at idle speed and accelerate to full speed Repeat twice more If the engine functions correctly go to Step IV If it cuts out open the L needle by 5 10 m
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