HIRTH ENGINE SETTING VALUES 55 HP Engine Fan cooled engine Engine 55HP FC Ign. Timing @ 2000 Carbureted 14 BTC Spark Plug Heat VI * 280 Spark Plug Gap.020-.024 No. of Carburetors Two Carburetor ID # Bing 54 Carburetor (38mm) Main Jet 160 Idle Jet 45 Jet Needle 6P2 Position 1 Needle Jet 2.72 Needle Position 1 Do not exceed RPM 5800 Peak HP RPM 5500 HP (4i Peak RPM 55 Peak Torque RPM 5000 Peak Torque Ft. Lb. 53.2 Maximum CHT 535 F Maximum EGT @ full power 1256 F Maximum EGT @ cruise RPM 1330 F Spark Plug * Compression Pressure 120 PSI Useful Links: * Optional Plugs : NGK BR 8 HS : Champion RL86C or #830, L78C : Nippon Denso W24 FSR-u : Bosch W3AC Official Bing Manual: www.bingcarburetor.com/manual.html Online Rebuild Manual: www.800-airwolf.com/pdffiles/articles/part%2052.pdf Online Tuning Manual: www.ultralightnews.com/enginetroublshooting/techtips/techtips2.htm Online Cleaning Guide: http://www.light-sport-aircraft.org/bing-54-carburetor-1.htm Assy 17738 Form 16941
Single ignition wiring diagram Form 17119
Spare part list - 55 HP Single Ignition Crankcase 2703 Figure Qty. Designation Part No. Neoteric Part No Remark 1 1 Crankcase, complete 270 ABIU Incl. Pos. 2. 3 2 2 Alignment pin DIN 1474 5x12 3 8 Stud screw DIN 835 M8x85 Loctite 58629 4 2 Sealing ring DIN 7603 5629 A6.5x9.5x2A1 5 1 Hose nipple 270 K4 5630 6 1 Rubber cap 083.18 7 l Hexagon head screw DIN 933 M6x10 8 7 Cylinder screw DIN 912 M8x50 Md = 23 Nm. Loctite 242 1 Set of gaskets 27/6 5861 Part 17116
Crankshaft 2703 Description Fig. Qty. No. 1 1 Crankshaft, complete 2 1 Deep groove ball bearing 3 1 Deep groove ball bearing 4 1 Deep groove ball bearing 5 2 Circlip 6 2 Shaft sealing ring 7 1 Space ring 8 Remark / Notes Neoteric Part # 7911 Includes items 2-7 5460 5461 5462 7912 5453 7913 Needle Bearing, Blue dot (#1) 7909 * Connecting Rods are Color-Coded with a Paint Dot on the Piston end. Needle Bearing, Yellow dot (#2) 6082 Needle Bearing, Red dot (#3) 6083 Engines built from 2010 onward also include a Number Code next to the Paint Dot. The coding corresponds to the correct Needle bearing size. (Approx 0.0003" [0.008mm] graduation between each size) 5464 Blue (#1) is the smallest and Green (#5) is the largest. Connecting rods with a Red (#3) dot are most common. 2 Needle Bearing, White dot (#4) Needle Bearing, Green dot (#5) 7910 If the paint dot is missing and no number code can be found, all bearings must be tried for the best fit. Part 17118 rev2
Exhaust system 2703 4 Fig. No. Quantity Designation Part No. Neoteric Part No Remark 1 2 Exhaust gasket 268 A4 5245 2 4 Cylinder screw DIN 912 M8x20 2288 Md = 23...26 Nm 3 1 Exhaust manifold 278 A1U 5548 Prepared for temperature meas. 4 4 Exhaust Spring 054.1 5421-2 M8x1x10 SHCS 6934 Removed from EGT Holes (not in sketch) Form 17120
Fan cooling system 2703 Flat Belt Cooling Fan (Old Style) Flat Belt (Old Style) Poly V Belt Cooling Fan (Current) Poly V Belt (Current) Form 17121 rev3
Fan cooling system 2703 Fig. No. 1 1 Fan housing, complete 273 BC1U 2 3 Alignment sleeve DIN 7346 8x10 Qty. Designation Ref. No. Neoteric Part No Note Includes Fig No. 4, 5, 7, 8, 9, 10, 11, 12 3 4 Cylinder screw DIN 912 M6x45 3258 Md = 9,6...11 Nm 4 1 Hexagon head nut DIN 985 M12x1,5 5 1 Washer DIN 125 B13-St 6856 7* 1 Flat belt 043.4/5 3409 7 1 Poly Flex belt 6390 8 2 Locking ring 9 2 10* 1 10 1 Deep groove ball bearing Fan wheel Assy, Flat belt Fan wheel Assy, Poly V DIN 472, J32 x 1,2 DIN 625 6002 2RZ/C3 273 AB1U 11 1 Bushing 263 A6 6885 Md = 27...30 Nm 6887 323 C1U 6391 12 1 Eccentric shaft 263 A7 6857 13 2 Thread screw 050.8/2 5997 14 4 Washer DIN 9021 B6,4 5996 15 4 Thread screw 050.8/2 5997 l6 1 Air guide cowl 273 J3U 5346 17 1 Metal plate 323 A7 6183 18 2 Hexagon head nut DIN 985 M4 2694 19 2 Washer DIN 125 B4,3 20 2 Screw DIN963 M4x10 2693 21 1 Washer DIN 988 S 13x19x1.5 3408 (5879 modified) *Used up to model year 2008 (Engine #901105 & Lower) Currently used, from 2008 onward (Engine #901106 & Higher) Incl. Pos. 8, 9, 10, 11 *Used up to model year 2008 (Engine #901105 & Lower) Incl. Pos. 8, 9, 10, 11 Currently used, from 2008 onward (Engine #901106 & Higher) Form 17363 rev2
Start device 2703 Fig. No. Quantity Designation Part No. Neoteric Part No Remark 1 3 Cylinder screw DIN 912 M6x35 6911 Md = 9,6...11 Nm 2 3 Spring ring DIN 7980 6 6940 3 1 Starter, mounted 265 A1U 5267 4 3 Cylinder screw DIN 6912 M8x35 Md = 23...28 Nm 5 3 Tab washer 053.8/8 5995 6* 1 Driving dog with starter, Flat 6203 *Used up to model year 2008 (Engine #901105 & Lower) 6 1 Driving dog with starter, Poly-V 275 AB3U 6389 Currently used, from 2008 onward (Engine #901106 & Higher) 7 2 Cylinder screw DIN 912 M8x30 2348 Md = 23...28 Nm - 2 Cylinder screw 275 L1 With starter 028.12 mounted 8 2 Tab washer 058.8/8 5995 9 1 E-starter 028.10 6498-1 Solenoid starter 028.12 5417 10 1 Starter-relay 032.20 6522 Form 17684 rev2
Fuel mixture (2-carburetor-version) 2703 Fig. No. Quantity Designation Part No. Neoteric Part No Remark 1 2 Gasket 277 A7 2 2 Intake manifold 277 G1 6567 3 8 Serrated lock washer 053.8/6 6902 4 8 Cylinder screw DIN 912 M6x20 2292 Md=9,6-11 Nm 5 4 Gasket 277 D7 5454 6a 1 Heat shield plate, right 277 P11 6b 1 Heat shield plate, left 277 P10 7 2 Rubber flange 078.1/3 6567 8 4 Tab washer DIN 137 B8,4 9 4 Cylinder screw DIN 912 M8x25 Md=23-28 Nm 10 2 BING carburetor 54/38/131 5333 Main Jet:160, Idle Jet:45, Needle Jet: 2.72 Jet Needle 6P2 Pos:1, Air screw: 0,5-1 11 2 Air filter 066.16 6622 Form 17685
Hirth HT4 Air Box Assembly Cutouts on FI Air Boxes Only; Carbureted Air Boxes have no Cutouts Fig. No. Qty Designation Neoteric Part # Remark 1 2 Rivet 2156 2 1 Fiberglass Air Box, Carbureted 5584 2 1 Fiberglass Air Box, FI 7764 3 2 Air Filter 6622 Includes item 4 4 2 Hose Clamp 2201 5 2 Large Washer 2516 6 2 Small Washer 2352 - - Air Box Assembly, Carbureted 5583 Includes item 1-6 as shown above - - Air Box Assembly, FI 7765 Includes item 1-6 as shown above Form 16619 rev2
Carburetor 2703 Form 17686
Carburetor 2703 Fig. No. Quantity Designation Part No. Neoteric Part No Remark Dual Carb Jets 1 1 Main jet 073.12/4/160 5876 Bold printed numbers are showing special sizes of jets 2 1 Needle jet 073.19/22/2.72 6177 and 3 1 Jet needle 073.19/11/6P2 I 6976 needles! 4 1 Idle jet 073.19/3/45 Note: 2 carb version Jets. 5 1 Adjusting screw for 073.19/4 idle 6 1 O-Ring 073.19/5 7 1 Throttle slide 073.19/10/2305 8 1 Mixture tube 073.19/2 9 1 Filter bushing 073.17/39 10 1 Bracket plate 073.19/12 11 1 Spring plate 073.19/36 12 1 Adjusting screw 073.17/7 13 1 Spring 073.17/8 14 1 Spring 073.19/14 15 1 Cover plate 073.19/15 16 1 O-Ring 073.19/16 17 2 Screw 073.3/5 18 1 Adjusting screw 073.6/16 7828 Kit Must purchase 7828 kit. 19 1 Nut 073.2/4 7828 Kit Must purchase 7828 kit. 20 2 Socket 073.17/31 7828 Kit Must purchase 7828 kit. 21 2 Float 072.19/7 22 1 Pin 073.17/14 23 1 Float pin 073.19/9 24 1 Clamping spring 073.17/41 25 1 Float chamber 073.19/6 26 1 Gasket 073.17/10 27 1 Spring clamp 073.17/11 28 1 Starting piston 073.19/17 7828 Kit Must purchase 7828 kit. 29 1 Sleeve 073.17/16 7828 Kit Must purchase 7828 kit. 30 1 Spring 073.19/18 7828 Kit Must purchase 7828 kit. 31 1 Starter housing 073.19/19 7828 Kit Must purchase 7828 kit. 32 2 Hose 073.19/1 33 1 Rubber cap for 073.19/31 primer connection 34 1 Float chamber 073.19/8 35 1 O-ring 073.19/33 Assy 17743 Form 17687rev2
Ignition lighting system single ignition 2703 Fig. No. Qty. Designation Part No. Neoteric Part No Remark 1 1 Hexagon head nut DIN 985 M16x1,5 6939 Md=140-150 Nm 2 1 Washer 161 A6 3 1 Flywheel with gear ring 021.43/2 4 2 Cylinder screw DIN 912 M5x20 5 4 Washer 212 A5 5994 6 1 Washer DIN 125 B5,3 6936 Md=4-4,5 Nm 7 1 Stator plate complete 021.43/1 5591 8 1 Flywheel alignment pin DIN 7 4m6x6 9 1 CDI - Box 021.43/6 5664 Mounted with silicone 10 2 Coil Mounting Screw M6XP1X12 SHC SS 2469 Included in item 15 15 2 Ignition coil 021.41/3/2 5682 30 2 Ignition cable, complete 274 BA10U 5827 31 1 Spark plug Denso 023.29 5668 W24 FSR - U10 32 1 VAPE R82 DC 029.8 5338 5641 Regulator 14V 33 Magnet Support 021.41/20 5724 34 1 Spark plug lead, short 5666 34 1 Spark plug lead, long 5665 34 1 Spark Plug lead set 5661 Includes plug boots Assy 17741 Form 17683
Single Cylinder ignition 2703 Fig. No. Quantity Designation Part No. Neoteric Part No Remark 1 2 Cylinder 272 U1 5860 2 2 Cylinder base gasket 272 A2 5455 3 1 Cylinder head F 302 Al 6181 Single Ignition 5 16 Cylinder screw DIN 912 M6x35 12.9 6232 Md = 11 Nm 6 16 Washer 212 A5 5994 7 8 Washer 190 A6 6162 8 8 Hexagon head nut DIN 934 M8 Md = 23...26 Nm 9 2 Piston set 014.72 5849 Incl. Pos. 11, 12, 13, 14 10 2 Piston 014.72/0 11 2 Piston pin 014.72/4 5972 12 4 Piston ring 014.72/1 6302 13 4 Retaining ring 014.72/5 6301 Part 5860
Miscellaneous 2703 Fig. No Quantity Designation Part No. Neoteric Part No Remark 1 Gasket Set DI27/3 5861 Includes: 2 Sealing Ring 055.24/1 5453 2 Cylinder base 272 A2 5455 gasket 2 Outlet gasket 268 A4 5245 1 Intake gasket 277 A2 2 Gasket 277 D7 5454 2 Sealing ring DIN 7603 A6, 5x9, 5629 5x2 Al
HIRTH ELECTRICAL COMPONENT RESISTANCE VALUES Volt Meter Terminal 1 Volt Meter Terminal 2 (Red Lead) (Black Lead) Value Unit Part Notes Yellow Wire Yellow Wire 0.080 Ohm 5591-55/65Hp Stator Coil Yellow Wire Mount Plate 450000000-550000000 Ohm (Magneto) Primary 1 Primary 2 0.351-0.429 Ohm Primary Secondary 450000000-550000000 Ohm Secondary 1 Secondary 2 2699.1-3298.9 Ohm 5682-55/65Hp Ignition Coil See Figure "A" Black & Green Wire Black & White Wire 0.396-0.484 Ohm Yellow & Brown Wire Black & White Wire 0.405-0.495 Ohm Black & Blue Wire Black & White Wire 0.387-0.473 Ohm Ground Black & White Wire 450000000-550000000 Ohm Secondary 1 Ground 1385.1-1747.9 Ohm Secondary 2 Ground 1386-1694 Ohm Secondary 3 Ground 1386-1694 Ohm Yellow Wire Yellow Wire 0.100 Ohm 6097-100Hp Ignition Coil 6564-100Hp Stator Coil (Magneto) See Figure "B" Black Red 2.950 Volts (DC) Red Black > 5.000 Volts (DC) Yellow Yellow 2.300 Volts (DC) 5338 - Hirth Voltage Regulator * Must have a multi-meter with a diode test to diagnose voltage regulator
HIRTH 55 HP ENGINE FAN CURVE Form 17005
Form 708