aprilia pegaso 650 carburetor problems

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APRILIA PEGASO 650 STRADA Assembling instructions

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Filed Under (Aprilia) by admin on 06-11-2010

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Centre stand APRILIA PEGASO 650 STRADA Item-No.: 505.791 2 quantitem no. description 1 712.1002centre stand 2 151.124 bolt 17,7 x ø40 2 150.994 washer ø19 x ø30 x 2,7 4 150.995 washer ø8,4 x 3 2 150.841 hexagon bolt screw M 8 x 30 2 150.978 retaining pin 3,2 x 40 1 150.979 spring set Typ 5 1 275.001 limitation rubber The kit includes the following parts: Please check now the function of your centre stand and control all screw connections after the assembly for tightness! General: Centrestand cornering clearance: HEPCO & BECKER centerstands are carefully designed and tested to eliminate reductions in cornering clearance and ground clearance under most driving conditions on an unmodified stock motorcycle, and are certified to be compliant with European ABE safety standards. Use of any centrestand may reduce corning clearance or ground clearance under extreme driving situations. HEPCO & BECKER products should be installed by a qualified, experienced motorcycle technican. If you are unsure of your ability to properly install a product, please have the product installed by your local motorcycle dealer. HEPCO & BECKER takes no resposibility for demages caused by improper installation. All screws, bolts, and nuts, including all replacement hard ware provided by HEPCO & BECKER, should be tightened to the torque specified in the OEM maintenance manual for your motorcycle. If no torque specifications are provided in the OEM maintenance manual, the following torques may be used: M 6 – 9,6 Nm M 8 – 23 Nm M 10 – 46 Nm All screws, bots und nuts should be checked after driving the first 50 km to ensure that all are tightened to the proper torque. Medium strength liquid thread-locker (i.e., „Locktite”

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Aprilia PEGASO 650 FACTORY – Technical specifications

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Filed Under (Aprilia) by admin on 26-10-2010

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Engine Single-cylinder four-stroke with light alloy cylinder. Liquid cooling with three way pressurised circuit. Single overhead cam with chain timing drive; four valves. Anti- vibration balancer shaft. Fuel Unleaded fuel. Bore and stroke 100 x 84 mm. Total displacement 660 cc. Compression ratio 10:1. Max. power at crankshaft 48 HP (35 kW) at 6,000 rpm. Max. torque at crankshaft 6.01 kgm ( 59 Nm) at 5,000 rpm. Fuel system Integrated electronic engine management system. Electronic fuel injection. 44 mm throttle body. Ignition Electronic. Starting Electric starter. Alternator 290 W Lubrication Dry sump with oil pump. Gearbox 5 speed. Transmission ratios: 1st 12/30 2nd 16/26 3rd 20/23 4th 22/20 5th 26/20 Clutch Multi-plate in oil bath. Cable operated. Primary drive Spur gears. Transmission ratio: 36/75. Final drive Chain. Transmission ratio: 15/44. Frame Steel, open cradle, single spar frame. Front suspension 45 mm fork. Wheel travel 140 mm. Rear suspension High strength steel swingarm. Aprilia Progressive System (APS) rising rate linkages. Sachs hydraulic monoshock with adjustable rebound and preload. Wheel travel 130 mm. Brakes Front: FTE stainless steel floating disc, ∅ 320 mm. Four piston radial caliper with radial master cylinder. Rear: stainless steel disc, ∅ 240 mm. Floating caliper

Aprilia PEGASO 650 Technical specifications

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Filed Under (Aprilia) by admin on 06-11-2010

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Engine Single-cylinder four-stroke with light alloy cylinder. Liquid cooling with three way pressurised circuit. Single overhead cam with chain timing drive; four valves. Anti-vibration balancer shaft. Euro 3. Fuel Unleaded fuel. Bore and stroke 100 x 84 mm. Total displacement 660 cc. Compression ratio 10:1. Max. power at crankshaft 48 HP (35 kW) at 6,000 rpm. Max. torque at crankshaft 6.01 kgm ( 59 Nm) at 5,000 rpm. Fuel system Integrated electronic engine management system. Electronic fuel injection. 44 mm throttle body. Ignition Electronic. Starting Electric starter. Alternator 290 W Lubrication Dry sump with oil pump. Gearbox 5 speed. Transmission ratios: 1st 12/30 2 nd 16/26 3rd 20/23 4th 22/20 5th 26/20 Clutch Multi-plate in oil bath. Cable operated. Primary drive Spur gears. Transmission ratio: 36/75. Final drive Chain. Transmission ratio: 15/44. Frame Steel, open cradle, single spar frame. Front suspension 45 mm fork. Wheel travel 140 mm. Rear suspension High strength steel swingarm. Aprilia Progressive System (APS) rising rate linkages. Sachs hydraulic monoshock with adjustable rebound and preload. Wheel travel 130 mm. Brakes Front: stainless steel floating disc, ∅ 320 mm, four piston caliper. Rear: stainless steel disc, ∅ 240 mm, two piston caliper. Wheels Alloy wheels with twinned spokes. Front: 3.50 x 17″. Rear: 4.50 x 17″.

Single-Cylinder BMW G 650 X Model Series

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Filed Under (BMW) by admin on 16-11-2010

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introducing the new range of single-cylinder models, BMW Motorrad is broadening its model line-up with a clear focus on additional target groups. Proceeding from the same technical foundation, the Company has created three new motorcycles absolutely different in their features and characteristics: the G 650 Xchallenge Hard Enduro, G 650 Xmoto Street Moto, and the G 650 Xcountry Scrambler. With their outstanding product substance, their purist looks, and their exceptionally sporting riding characteristics, these single-cylinder models are filling attractive niches in the market. And through their low unladen weight of less than 160 kg or 353 lb according to the DIN standard, they offer dynamic performance for both the connoisseur and the sports-minded rider. Market launch of the new G 650 X model series is planned in good time for the beginning of the season in spring 2007. These new machines with the smallest engines in the BMW model range offer particularly the young and young-at-heart motorcycle rider exactly the right entry into the world of BMW motorcycles, but are not entry-level bikes in the conventional sense of the word: On the contrary, the G 650 Xchallenge Hard Enduro will thrill the customer who wishes to really benefit from the enormous offroad potential of his machine. The G 650 Xmoto Street Moto, in turn, with its very impressive active riding qualities, offers the genuine enthusiast a new dimension in riding pleasure. The G 650 Xcountry Scrambler, finally, stands for carefree riding pleasure and nimble performance both on the road and off the beaten track. Indeed, this unique machine is able to meet all kinds of requirements and offer virtually all riding qualities ranging from city use via country roads and small, winding lanes, all the way to offroad tracks presenting the most challenging requirements. The G 650 Xcountry therefore conveys the classic but relaxed feeling of riding a genuine Scrambler as well as the concept of “wandering” on your motorcycle into today’s world in a most modern style. And last but certainly not least, riding pleasure is guaranteed under all conditions and in every situation, since the G 650 Xcountry offers the same outstanding engine and running gear qualities as its two very sporting “sister models

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KTM 60 SX / 65 SX REPAIR MANUAL ENGINE

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Filed Under (KTM) by admin on 12-11-2010

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Carburetor adjustment Basic information about the original carburetor setting The original carburetor setting was adapted for an altitude of approx. 500 meters (1600 ft.) above sea level, and the ambient temperature of approx. 20°C (68°F), mainly for off-road use and central European premium-grade fuel (ROZ 95). Mixing ratio 2-stroke motor oil : super fuel 1:40 . Basic information of changing the carburetor setting Always start out from the original carburetor setting. Essential requirements are a clean air filter system, air-tight exhaust system and an intact carburetor. Experience has shown that adjusting the main jet, the idling jet and the jet needle is sufficient and that changes of other parts of the carburetor will not greatly affect engine performance. RULE OF THUMB: high altitude or high temperatures  choose leaner carburetor adjustment low altitude or low temperatures  choose richer carburetor adjustment * WARNING * -ONLYUSE PREMIUM – GRADE GASOLINE ROZ 95 MIXED WITH HIGH – GRADE TWO – STROKE ENGINE OIL . OTHER TYPES OF GASOLINE CAN CAUSE ENGINE FAILURE , AND USE OF SAME WILL VOID YOUR WARRANTY . -ONLYUSE HIGH – GRADE 2- STROKE ENGINE OIL OF KNOWN BRANDS ( I . E .SHELL ADVANCE RACING X). -NOTENOUGH OIL OR LOW – GRADE OILCAN CAUSE EROSION OF THE PISTON . USING TOO MUCH OIL , THE ENGINE CAN START SMOKING AND FOUL THE SPARKPLUG . -INTHE CASE OFA LEANER ADJUSTMENT OF THE CARBURETOR PROCEED CAUTIOUSLY . ALWAYSREDUCETHEJETSIZEINSTEPSOFONENUMBERTOAVOID OVERHEATING AND PISTON SEIZURE . NOTE: If despite a changed adjustment the engine does not run properly, look for mechanical faults and check the ignition system. Basic information on carburetor wear As a result of engine vibrations, throttle valve, jet needle, and needle jet are subjected to increased wear. This wear may cause carburetor malfunction (e.g., overly rich mixture). Therefore, these parts should be replaced after 1000 hours of using. Idling range – A Operation with closed throttle valve. This range is influenced by the idle adjusting screw 1 . Only make adjustments when the engine is hot. The idling speed can be changed by turning the idle adjusting screw. Turning it clockwise produces a higher idling speed and turning the screw counterclockwise produces a lower idling speed. Opening up – B Engine behavior when the throttle opens. The idle jet and the shape of the throttle valve influences this range. If, despite good idling-speed and part-throttle setting, the engine sputters and smokes when the throttle is fully opened and develops its full power not smoothly but suddenly at high engine speeds, the mixture to the carburetor will be too rich, the fuel level too high or the float needle is leaking. Part-throttle range – C Operation with partly open throttle valve. This range is only influenced by the jet needle (shape and position). The optimum part-throttle setting is controlled by the idling setting in the lower range and by the main jet in the upper range. If the engine runs on a four-stroke cycle or with reduced power when it is accelerated with the throttle partly open, the jet needle must be lowered by one notch. If then the engine pings, especially when accelerating under full power at maximum engine revs, the jet needle should be raised. If these faults should occur at the lower end of the part throttle range at a four-stroke running, make the idling range leaner; if the engine pings, adjust the idling range richer

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HSR Carburetor Total Kits Installation Instructions

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Filed Under (Mikuni) by admin on 31-10-2010

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Intake Manifold: 1. Install MAP sensor in Mikuni manifold (Twin Cam only). 2. Attach the Mikuni manifold to the engine. Align the manifold before tightening the bolts. The flange surface of the Mikuni manifold should be parallel with the front of the engine’s cam cover. Use a level or angle meter to check this. Tighten the manifold bolts. 3. Attach the rubber flange to the Mikuni manifold with the furnished 5/16″x3/4″ bolts and washers. Choke Cables: Mikuni & Harley-Davidson Route the cable with largest radius bends possible. Check the cable for free-play after installation. If there is no free-play, the engine may run rich and deliver poor performance or low fuel mileage. Harley Cable (Twin Cam Kits: 42-19, 45-4) : 1. Remove the Harley choke cable from the stock carb. 2. Remove the spring and plunger from the cable. 3. Remove the spring and plunger from the Mikuni. 5. Install the Mikuni spring and plunger onto the Harley choke cable. Change nothing else; be sure to use the Harley plastic nut, not the Mikuni nut (See Figure 1). Total Kit Installation Instructions The HSR series carburetors are precise yet durable instruments; however, like any other piece of fine equipment, they require correct installation and reasonable care to assure optimum performance and long life. Extra time spent during installation will pay off in both short and long term performance and reliability. This Mikuni HSR carburetor kit is designed to be a bolt-on application, and as such, is set-up and jetted properly for most applications. However, since Harley-Davidson motors are often highly modified, alternate tuning settings may be required. The Mikuni Tuning Manual helps make jetting alterations and adjustments an easy matter. NOTE: Carburetor Kits not designated as C.A.R.B. exempt, are not legal for motor vehicles operated on public highways in the state of California, or in any other states and countries where similar laws apply. WARNING NOTE: NOTE: WARNING CAUTION NOTE: NOTE: TK-2 6. Install the new assembly into the Mikuni carburetor. Be careful to only gently tighten the plastic nut. 7. Loosen the knurled plastic friction nut behind the choke knob and check for free-play (see Figure 2). Figure 1: Harley nut with Mikuni spring & plunger Figure 2: Choke cable adjustments Mikuni Cable (Evo Kits: 42-8, 45-2 & 45-3) : 1. Remove nut, spring and plunger from the Mikuni. 2. Install the nut, spring and plunger onto the cable. 3. Install the assembly into the Mikuni HSR carburetor. Be careful to only gently tighten the plastic nut. 4. Check for free-play. Adjust the cable as necessary. An optional choke cable mounting bracket is included in the Evo kits for custom installations. Carburetor Installation: 1. Insert the carb fully into the rubber flange, align with engine and tighten the clamp. 2. Slip the fuel hose onto the carburetor’s fuel fitting and secure with the enclosed hose clamp. NOTE: Some Twin Cam installations may require removal of a small amount of fin material from the cylinders to clear the float bowl. Throttle Cables The HSR carburetor uses stock 1990 and later Harley- Davidson cables. However, if your Harley is fitted with some other carburetor, you may need to purchase a set of cables. See your dealer for the correct cable set. 1. Route the throttle cables with large radius curves and so they do not interfere with other components. 2. Screw the cable adjusters together to make them as short as possible. 3. Connect the “close” cable first (see Figure 3). 4. Install the “open” cable next (see Figure 3). 5. Adjust the opening cable until the slide can be opened fully. Snug the adjuster lock nut. 6. Turn the handlebar to the right and adjust the throttle free-play with the closing cable adjuster to approximately 1/8″ (see Figure 4)

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ODYSSEY DRYCELL MOTORCYCLE BATTERY COMPATIBILITY

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Filed Under (Triumph) by admin on 30-10-2010

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BMW 1200 1200 1150 1100 1100 1000 1000 1000 1000 900 850 800 800 800 750 750 750 750 750 650 650 600 600 500 BUELL 1200 1200 1200 1000 DUCATI 860 750 500 HARLEY DAVIDSON 1570 1570 1450 1450 1340 1340 1340 1200 883 HONDA 1800 1500 1200 1100 1000 1000 900 750 750 650 650 650 600 400 200 150 150 125 K1200RS, LT R1200C R1150GS, R R1100GS/R R1100RS/T/S/LT “K” Models R100/7 100RS R100GS, R, RS, RT R90/6, R90S R850R R80GS, R80ST R80, R80RT R80/7/RT K75, RT K75C, S R75/5 R75/7 R75/6 R65 R65LS R60/5 R60/6, R60/7 R50/5 S1 Lightning X1, S3, S3T, M2 S2/T, RS1200, RR1200 RR1000 GT, GTS GT, Laguna Seca GTL, GTV, Sport FXST, FLST FXD FXD FXST, FLST FXD FXST, FLST FL/H/T/HT XL, XLH XLH, XLH GL1800, VTX1800C Gold Wing-All Gold Wing-All Gold Wing-GL1100 CBX1000, SS opt. Gold Wing-GL1000 CBR900R,RR CB750A (Hondamatic) VFR740R/ RVF750R NT650, SLR650, NX650 Vigor 650 XR650L VT600C, CD, CBR600 CBR400F CB-1 TR200 Fat Cat CH150 Elite FES150 FES125, Pantheon (97 -) (98 -) (00 -) (94-00) (90 -) (83-93) (76-84) (83) (87-95) (69-76) (95-97) (80-96) (84-95) (78-84) (85-95) (85-95) (70-73) (76-84) (69-76) (84-95) (78-84) (70-73) (69-84) (70-73) (96-99) (ALL) (ALL) (87) (2007) (2007) (99-06) (00-06) (97-99) (91-99) (80-96) (97-03) (97-02) (01-06) (88-00) (84-87) (80-83) (82) (75-79) (93-99) (76-78) (90/94) (88-91) (ALL) (93-06) (87-03) (89-90) (86) (87) (ALL) (ALL) #3561 #3561 #3561 #3561 #3561 #4989 #4989 #3561 #4989 #4989 #3561 #3561 #4989 #4989 #4989 #3561 #3561 #4989 #4989 #4989 #3561 #3561 #4989 #3561 #3591** #3591 #3591 #3591 #4989 #4989 #3561 #3591 #2528 #2528 #3591 #2528 #3591 #3560 #2528** #2528** #2528 #3560* #3560* #3560* #3560* #3560* #2519* #3560* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* PC680 PC680 PC680 PC680 PC680 PC925L PC925L PC680 PC925L PC925L PC680 PC680 PC925L PC925L PC925L PC680 PC680 PC925L PC925L PC925L PC680 PC680 PC925L PC680 PC545MJ PC545MJ PC545MJ PC545MJ PC925L PC925L PC680 PC545MJ PC545 PC545 PC545MJ PC545 PC545MJ PC680MJ PC545 PC545 PC545 PC680MJ PC680MJ PC680MJ PC680MJ PC680MJ PC310 PC680MJ PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 cc model (year) cat. # mfg sku # KAWASAKI 1500 1500 1300 1000 1000 900 900 750 750 650 636 600 600 KTM 640 620 400 400 MOTO GUZZ I 1100 1100 1100 1000 1000 850 850 750 650 650 650 500 POLARIS All SUZUKI 1400 900 750 750 750 650 600 600 600 600 400 TRIUMPH 600 YAMAHA 1600 1300 1300 1200 1100 1100 1100 920 600 600 VN 1500-A Vulcan VN 1500-C Vulcan KZ 1300 Touring KZ 1000-P Police Z1000 ZX900-C, Ninja ZX900-E, F Ninja KZ750-L, Ninja Zx750 Ninja ZX, 7RR KLX650C, R ZX636-B Ninja ZX-6R ZX600-G, J Ninja ZX ZX600-K Ninja ZX Adventure, Duke, RXC Adventure, Duke, LC4 LC4 E/XC RXC LC4 Cali/Spc/Jackl/Stone/EV Quota/Sport 1100 VII EV/Bassa California III,Quota,Millie Convert,Daytona, LeMans LeMans T3, T4, T5 Nevada,NTX,Strada,V7,V75 NTX V65 V65 Florida V50 Victory GV 1400GC RF900, R, S, ZS GSX750F Katana GSX-R750 GSXR750W DR650SE GSF600S Bandit GSX600F Katana GSX-R600 RF600R, S GSF400 Bandit Daytona 600 XV 1600 Road Star 1300 Royal Star XVZ Venture Royale XVZ12T Venture XJ1100 Maxim XS 1100, L, S XV 1100, S/ Virago XV 920/R/M Virago XJ600S Seca II XT600E (87-98) (96-97) (79-82) (82-05) (03-04) (98-99) (00-04) (93) (91-97) (93-96) (03-04) (98-02) (03) (99-02) (96-98) (96-98) (96-01) (94-05) (97-02) (98-99) (ALL) (86-88) (94-97) (98-03) (96-99) (94-95) (96-04) (96-03) (98-04) (97-03) (94-96) (91-93) (03-04) (99-03) (96-03) (86-92) (83-85) (82) (78-92) (86-99) (81-83) (92-98) (90-95) #3560 #3560 #3560 #3560 #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #4989 #2528 #4989 #4989 #4989 #4989 #4989 #3561 #3561 #4989 #3561 #4989 #2519* #3560 #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2519* #2528*** #2528*** #3560 #3560 #3560 #3560 #3560 #3560 #2519* #2519* PC680MJ PC680MJ PC680MJ PC680MJ PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC925L PC545 PC925L PC925L PC925L PC925L PC925L PC680 PC680 PC925L PC680 PC925L PC310 PC680MJ PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC310 PC545 PC545 PC680MJ PC680MJ PC680MJ PC680MJ PC680MJ PC680MJ PC310 PC310

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HARLEY DAVIDSON BIG TWIN SPIGET MOUNT CARBURETOR INSTALLATION MANUAL

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Filed Under (Harley Davidson) by admin on 26-03-2012

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A. BEFORE INSTALLATION OF YOUR NEW ZENITH CARBURETOR, NSPECT THE RUBBER MANIFOLD SEAL FOR NICKS,CRACKS, OR DEBRIS. APPLYING A LIGHT FILM OF PETROLEUM BASED LUBRICANT AROUND THE INSIDE LIP OF THE RUBBER SEAL WILL ALLOW THE CARBURETOR TO SLIP INTO PLACE EASIER. B. BEFORE ACTUAL INSTALLATION OF UNIT INTO MANIFOLD, THROTTLE CABLES SHOULD BE HOOKED TO THETHROTTLEWHEEL.MAKESURETHATTHE PULL CABLE IS LOCATEDPROPERLY TO OPEN THE THROTTLE PLATE (IN SOME APPLICATIONS THROTTLE CABLE SLACK MAY NEED TO BE ADJUSTED FOR PROPER HOOKUP AND OPERATION) SEE FIG. #1 C. AFTER THROTTLE CABLES ARE PROPERLY HOOKED UP,UNITCAN BE INSERTED INTO MANIFOLD. MAKE SURE THAT UNIT IS FULLY SEATED. WITH CARBURETOR SEATED INTO MANIFOLD AND FUEL LINE HOOKED UP TO FUEL INLET, INSTALL CHOKE CABLE AND HOOK TO CHOKE LEVER. PLACE AIR INTAKE GASKET ON END OF CARBURETOR, NEXT PLACE INTAKE ADAPTOR OVER INTAKE GASKET. SEE FIG#2 ZENITH MOD.16P12 SPIGET MOUNT CARBURETOR -HARLEY DAVIDSON ™ BIG TWIN INSTALLATION INSTRUCTIONS FIG. # 1 FIG. # 2 D. WITH ADAPTOR IN PLACE, LOCATE THE STOCK AIR BOX OVER THE ADAPTOR, UTILIZING THE STOCK AIR BOX GASKET (THERESHOULDBENO GAPS BETWEEN ADAPTOR, AIRBOX OR CARBURETOR WHEN PROPERLY INSTALLED) STAND-OFF SPACERS PROVIDED ARE TOBEPLACEDBETWEENAIR BOX& ENGINE HEADS BEFORE INSTALLING THE VENT/RETAINING BOLTS. FOR EVALUATION ENGINES STOCK VENT BOLTS CAN BE USED WITH LARGERI.D. SPACER PROVIDED. SEE FIG#3 E. WITH AIR BOXSECURELY IN PLACE, INSTALL THE AIR FILTER COVER RETAINING BRACKET AND FILTER USING THE STOCKBOLTS, AND REPLACE AIR FILTER COVER AND SECURE WITH STOCK BOLT. SEE FIG#4 F. AFTER INSTALLATION IS COMPLETE AND FUEL FLOW HAS BEEN RE-ESTABLISHED, CHECK FOR ANY LEAKS BEFORE STARTING ENGINE. H. AFTER STARTING ENGINE, SOME ADJUSTMENTS OF IDLE AND MAIN JET MAYBE REQUIRED FOR PROPER OPERATION. AFTER ADJUSTMENTS HAVE BEEN MADE AND WITH ENGINEAT IDLE, TURN WHEEL FULLYTOLEFTANDRIGHT.ANYCHANGEIN IDLE SPEED INDICATES THROTTLE CABLES ARE TOO TIGHT AND MORE SLACK MUST BE PROVIDED.

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HSR Carburetor Total Kits Installation And Tuning Manual

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Filed Under (Tips and Review) by admin on 31-10-2010

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1. Disconnect the battery ground wire from the battery. 2. Turn the fuel petcock to the “OFF” position. 3. Elevate the rear of the fuel tank for better access to the carburetor area. 4. Remove the coil, horn or other devices on the left hand side of the engine to allow free access to the intake manifold bolts. 5. Remove the complete air cleaner assembly, including the backing plate. 6. Disconnect any vacuum hoses and the fuel hose from the stock carburetor. 7. Disconnect the choke cable from the frame. 8. Remove the stock carburetor. 9. Evo: remove the stock manifold. 10. Twin Cam: unplug MAP sensor, remove manifold and then remove the MAP sensor from the manifold. Installation: Intake Manifold: Twin Cam only: Install MAP sensor in Mikuni manifold. 1. Attach the Mikuni manifold to the engine. Align the manifold before tightening the bolts. The flange surface of the Mikuni manifold should be parallel with the front of the engine’s cam cover. Use a level or angle meter to check this. Tighten the manifold bolts. 2. Attach the rubber flange to the Mikuni manifold with the 5/16″x3/4″ bolts and washers. To ease installation, use liqiud detergent to lubricate the manifold seals. Choke: Evo: We recommend that you use the Mikuni choke cable that is furnished with the carburetor. However, you can use the stock Harley cable (’90-’99 models only) if you follow the Twin Cam choke cable instructions. Twin Cam: 1. Remove the Harley choke cable from the stock carb. 2. Remove the Harley spring and plunger from the Harley choke cable. 3. Remove the Mikuni spring and plunger from the Mikuni carburetor. 5. Install the Mikuni spring and plunger onto the Harley choke cable. Change nothing else; be sure to use the Harley plastic nut, not the Mikuni nut. 6. Install the new assembly into the Mikuni. Be careful to only gently tighten the plastic nut.

Tuning the HSR42/ 45 Carburetor

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Filed Under (Tips and Review) by admin on 31-10-2010

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your Mikuni HSR is fitted with the tuning parts we found to work with the great majority of engine performance modifications. However, the large number of differing exhaust systems and cams available makes it impossible to accommodate all possible combinations with one carburetor set-up. Your HSR will almost certainly run correctly on your engine without exchanging any parts. But, if it doesn’t, you may alter its tuning to suit your engine’s needs by following this guide. Some exhaust system designs strongly interfere with carburetor tuning. For instance, it is very difficult to get smooth and responsive carburetion through the entire rpm range with straight pipes and completely open exhausts. In addition, very small volume, small diameter mufflers are often ‘seen’ by the engine as straight pipes and present the same tuning difficulties. Very long duration cams often cause relatively poor running below about 3,000 rpm, depending upon the individual cam’s intake valve closing point. Such cams cause reverse airflow out the mouth of the carburetor (often called “reversion” or “standoff”) that can be mistaken for a carburetor tuning problem. Harley-Davidson Screamin’ Eagle performance parts are proven and predictable. If you have any doubts about a particular exhaust system, air cleaner or ignition, you may substitute the Harley Screamin’ Eagle parts as a “reality check.” When re-tuning is required, it usually involves small alterations to the idle and/or main system. The following pages supply enough information to make such alterations relatively simple. Please note that there is no point in attempting to tune any carburetor unless the engine is sound and in a good state of tune. If you have any doubts about the general condition of your engine, have it checked by your dealer or an experienced mechanic before attempting to fine-tune your Mikuni.

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