kawasaki 750 jet ski carburetor adjustment

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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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KTM 250/ 300/ 380 SX,MXC,EXC ENGINE REPAIR MANUAL

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

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Repair manual KTM 250 / 300 / 380 Art No 3206004 -E 2-2C main jet jet needle jet needle air control screw idle adjusting screw idle jet throttle valve Idling range A Operation with closed throttle valve. This range is influenced by the position of the air control screw 1 and the idle adjusting screw 2 . Only make adjustments when the engine is hot. To this end, slightly increase the idling speed of the engine by means of the idle adjusting screw. Turning it clockwise produces a higher idling speed and turning the screw counterclockwise produces a lower idling speed. Create a round and stable engine speed using the air control screw (basic position of the air control screw = open by 1.5 turns). Then adjust to the normal idling speed by means of the idle adjusting screw. 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. Full throttle range D Operation with the throttle fully open (flat out). This range is influenced by the main jet and the jet needle. If the porcelain of the new spark plug is found to have a very bright or white coating or if the engine rings, after a short distance of riding flat out, a larger main jet is required. If the porcelain is dark brown or black with soot the main jet must be replaced by a smaller one. mixture too rich: too much fuel in proportion to air mixture too lean: not enough fuel in proportion to air 1 2 OPERATING RANGES OF THE CARBURETOR 2-3C Carburetor adjustment Basic information on 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 MOZ). Mixing ratio 2-stroke motor oil : super fuel 1:40 – 1:60. Basic information on a change of 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:

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Honda CARBURETOR ADJUSTMENT TOOLS

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Filed Under (Honda) by admin on 17-12-2011

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K&L CARBURETOR ADJUSTMENT WRENCHES These tools use tough and accurate bevel gear actuation instead of cable for professional use. The aluminum handle includes index marks for accurate tuning. Sold each. Three types available: 35-9653 Slot-type Pilot Screw Adjustment Wrench for Kawasaki/Suzuki/Yamaha 35-9658 Slot-type Pilot Screw Adjustment Wrench with longer tip for Kawasaki/Suzuki/Yamaha 35-9650 D-type Keihin Pilot Screw Adjustment Wrench for Honda 90-DEGREE 1/4″ HEX DRIVER This gear driven, 1/4″ hex driver set is made of high-grade aluminum and stainless steel. Strongest tool of it’s type on the market. Designed for use on hard-to-reach pilot air screws on inline fours. Can be used with any 1/4″ or 6mm hex bits. 35-7820 90-Degree 1/4″ Hex Driver Set: Includes straight slot, phillips, d-shape pilot screw bit, 6mm hex jet bit & 1/4″ – hex – 1/4″ drive bit. FCR CARB TOOL Set includes three bits – 6mm hex for main jets, long reach straight slot for pilot jets and 3mm allen for float bowl removal. Longer bits make this set ideal for reaching into recessed cavities when adjusting Keihin FCR carburetors. Sold as a set. 35-7978 FCR Carb Tool 12″ DRILL BIT For removal of carburetor plug. (mixture screw plug) 1/8″ bit x 12 inch length. 35-1186 YM-33217-16 JET DRIVER 35-2270 Perfect for removal of jets from small recessed passages

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Triumph SU CARBURETORS SERVICING AND TUNING

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Filed Under (Triumph) by admin on 29-10-2010

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Jets: These are made in various sizes ranging from.099 inches to.1875 inches, the larger sizes being used only for racing or very high performance engines. The two sizes most commonly found on production cars are the.090 inch and the.100 inch. The size of the jet will be found stamped on the jet head. The figure “nine”wilt indicate that it is the.090 inch and the figure “one”will indicate the.100 inch jet. When tuninga production car the jets size should be checked to make sure that it is of the size recommended by the manufacturers. Centering of Jet: If for any reason, the jet assembly has been removed, it will be ne cessary to recenter the jet. First, remove the clevis pin at the base of the jet which attaches the jet head to the jet operating lever. Withdraw the jet completely and remove the adjusting nut and spring, then replace the adjusting nut, without its spring, and screw it up toits highest position. Slide the Set into position until the jet head is against the base of the adjusting nut. When this has been done, find out if the piston is perfectly free by lifting it up with the finger and allowing it to drop. If the piston is not entirely free, slacken the jet screw and manipulate the lower part of the assembly, including the projecting part of the bottom half of the jet bearing, adjusting nut, and jet head. Make sure that this assembly is now slightly loose. The piston should then rise and fall quite freely as the needle is now able to move the jet into the required central position. The jet screw should now be tightened and a further check made to determine that the piston is still quite free. When complete freedom of the piston is achieved the jet adjusting nut should be removed, together with the jet, and the spring replaced. Experience has shown that a large percentage of carburetors, which have given trouble has been due to the incorrect centering of jets. Jet Needles— These are made in a great variety of sizes, probably now well over two hundred and fifty, and each type of engine hasaneedlethat has been selected, after very careful tests have been carried out, to give the best all-round performance. Most manufacturers actually give three alternative needles for each type and size of engine, these needles clearly being listed by the manufacturer “Standard”, “Rich”or”Weak”and before tuning is started the needle, which is marked on the shank should be checked against the manufacturer’srecommendation to make quite sure that the right needle is fitted; this is most important.

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KAWASAKI Jet Ski STX-12F SPECIFICATIONS

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Filed Under (Kawasaki) by admin on 05-11-2010

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FEATURES & BENEFITS Kawasaki 2007 SPECIFICATIONS: JT1200D7F Engine type……………… 4-stroke, water cooled, 4- cylinder Displacement…………… 1,199 cm3 Bore & stroke…………… 83.0 x 55.4 mm Compression ratio…… 11.2:1 Induction system……… DOHC 16 valve (4 valves per cylinder) Maximum power………. 92 kW (125 PS) / 7,200 r/min Maximum torque……… 125 N·m / 6,500 r/min Cooling system……….. inducted water Fuel system…………….. EFI with single 54 mm throttle Starting ……………………. electric Battery…………………….. sealed, 12V 18Ah Propulsion system…… axial flow, single stage jet pump Maximum thrust………. 3,675 N (375 kgf) Seating capacity………. 3 seater Fuel capacity…………… 62 L L x W x H…………………. 3,120 x 1,180 x 1,050 mm Dry weight……………….. 334 kg Colours……………………. Red NOTE: Specifications subject to change without notice ENGINE Ñ Chrome composite plated cylinders are lightweight, durable and quickly carry heat away from the combustion chamber and piston for supreme durability at high power output. Ñ Semi-dry sump uses a single feed oil pump. Ñ Tip over protection shuts the engine off if the craft tilts more than 61o. Ñ 4-valves per cylinder provides maximum valve area for optimum flow. Fuel system Ñ Electronic Fuel Injection (EFI) with a single Mitsubishi throttle body and an injector at each intake port. Ñ Long intake tract enhances low-end power. Ñ Large capacity, low-noise airbox. Ñ Finger-type throttle reduces hand fatigue. Water-jacketed semi-dry exhaust Ñ Double-walled exhaust manifold and dual waterboxes help reduce noise. Ñ Water surrounding the exhaust system lowers engine compartment temperatures for more power. Ñ Semi-dry exhaust system keeps cooling water out of the exhaust before the waterbox to prevent water from entering the engine if the boat should capsize. Ñ Emissions meet US EPA 2006 and CARB 2008 regulations. Lanyard engine stop switch Ñ Engine will not crank with lanyard removed. Ñ Fastened to the rider, lanyard cuts the ignition if the rider dismounts. DRIVE SYSTEM Three-blade oval edge stainless steel impeller Ñ The shape of the blades give maximum efficiency with minimum cavitation. Ñ Fully enclosed impeller for damage protection. Ñ Stainless steel pump insert increases durability and helps ensure reliable performance. Ñ Tough stainless steel is used for incredible durability. HULL Ñ One-piece chopper over foam (COF) hull construction is lighter than a conventional hand-laid hull of similar size. Ñ Cab forward design makes more space for the rider and passengers. Ñ Gel coat for deep, lustrous, scratch resistant finish. Ñ Open rear deck for carrying bulky items, putting on skis, etc. Ñ
An automatically retractable boarding step makes boarding from deep water easy. Kawasaki Smart Steering (KSS) Ñ A steering sensor is linked to the EMM to aid in boat handling when the throttle is quickly released from high speed. Detail features Ñ 62 litre fuel tank for increased range. Ñ LCD instrumentation includes digital speedometer, tachometer, hour meter, clock, trip distance, trip time, fuel level and warning lamps. Ñ Includes high tech. troubleshooting function for the fuel injection system. A computer hook-up allows easy retrieval of entire troubleshooting history. Ñ A remote cooling system flushing point is included. Ñ Front hatch made of ABS for reduced weight, increased durability and enhanced appearance. Ñ Mirrors mounted on the deck reduce weight and enhance appearanced

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Kawasaki KZ750 Twin Carburetor Installation Manual

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Filed Under (Kawasaki) by admin on 25-10-2010

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The first Kawasaki KZ750 twin was built in 1975 and sold as a 1976 model as a KZ750B1. For the first four years of production (1976-79), the KZ750B1 through B4 shared identical Mikuni BS38 carburetor assemblies. These assemblies are probably the heaviest twin-carb assemblies ever built and have a couple unique features. The biggest oddity is that the Kawasaki version of the BS38 uses a system where both the pilot jet and main jet are screwed into the float bowl. A good bowl gasket is critical because gas is drawn from the jets into the internal passages that lead to the venturi via channels beneath the gasket inside the float chamber. The pilot jets used are standard BS series fare in that they are Mikuni BS30/96 type but the main jets are unique to Kawasaki BS38 carburetor assemblies. They look like very small air jets and are frequently stripped as they require the correct sized small screwdriver to remove

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Kawasaki Sxi/ SXR Ignition twin cylinder Jet Ski ignition Installation Instructions

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Filed Under (Kawasaki) by admin on 25-10-2010

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1. Remove electronics enclosure from its mounting location. 2. Unplug and remove the OEM ignition. 3. Set the programming switches on the T3 to your settings. 4. Install the T3 Ignition in the same location in the electronics enclosure. 5. Test the T3 Ignition. 6. Close the electronics enclosure cover plate and mount the module in the PWC. Installation Remove electronics enclosure from its Mounting Location 1. Using a 10mm socket remove the mounting bolts on each side of the electronics enclosure. 2. Remove the enclosure cover and set aside the screws, 2 mounting flanges, ‘O” ring, and enclosure top. Unplug and Remove the OEM Ignition 1. Using 10mm socket, remove bolts from each side of the OEM ignition. Lift out the ignition and unplug all connectors attached to the OEM ignition. Now remove the protective metal plate that was under the ignition and two 3/16″ thick washers under that plate. 2. On 2004 models and newer remove the wire harness for the two black connectors just unplugged from the OEM ignition. Trace each wire from each black connector back to in-line connectors and separate each of these connectors. Set the two harnesses aside. Install the T3 Ignition in the Electronics Enclosure 1. Install the T3 ignition into the mounting bracket supplied with your T3. Slide the end of the ignition module under the lip at the rear of the bracket an press the wire end of the ignition firmly into the bracket. Attach the keeper bracket using two 5mm bolts supplied. Place the ignition/bracket in the location where the OEM ignition and metal plate were removed. Secure the ignition in place with the supplied bolts

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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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Yamaha Road Star NEEDLE/ JET KIT INSTALLATION INSTRUCTIONS

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Filed Under (Yamaha) by admin on 10-11-2010

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1. Remove the vacuum slide from the carburetor. 2. Remove the OEM needle, spacer and washers, noting order of assembly. 3. Counting from the top to the bottom, install the new Baron needle clip on groove #4 for 04-07 models and on groove #5 for 99-03 models of the replacement. NOTE: Baron adjustable needle – The top is the blunt end of the needle. 4. Reinstall the OEM spacer and washers as shown in this diagram. 5. Reinstall the vacuum slide along with the diaphragm spring. 6. Reattach the diaphragm cover back and tighten screws. NOTE: Verify that the slide maintains its full range of movement. 7. Drain the fuel from the float bowl and remove the bowl cover. 8. Remove the OEM main jet and replace it with a Barons genuine Mikuni main jet. Install the correct main jet as indicated in JET SELECTION area above on this page. Our install guides provide a basic outline on the proper installation of our products. Further tuning and/or fitment may be required. Page: 2 BA-2420RD NEEDLE/JET KIT – Yamaha Road Star (99-07) 9. Thoroughly clean the inside of the float bowl prior to reinstalling it. 10. Reassemble the carburetor by reversing the order of step #1 through step #10. Use the new cap head allen screws in place of the OEM phillips head screws. 11. Locate the fuel mixture screw – it will either be a screw head or a brass plug. If it is a screw head, skip to step #11c. 11c. If you see a brass plug with a small hole in the center, proceed as follows: With the drill bit, carefully and slowly drill through the fuel mixture plug. CAUTION: The fuel mixture screw is located directly beneath this plug. Be prepared to stop the drill and remove the bit the instant you break through the plug. Insert the self-tapping sheet metal screw into the drilled hole and remove the plug. With air/fuel screw now accessible, use a flat blade screwdriver to turn the screw clockwise until it seats, then carefully turn it counter-clockwise 3 1/2 turns. Refer to step #16 for assistance in fine tuning the setting of the air/fuel adjustment screw. 12. Reinstall the carburetor. We strongly suggest that you attach the throttle cables prior to mounting to intake manifold. 13. Reconnect the fuel line, ensuring the clamp is firmly in place. 14. Reinstall all vent hoses and electrical connectors that were previously removed, checking for any obstructions or blockage. 15. Reinstall the OEM air filter assembly or, if you are installing our Big Air Kit (BAK), follow the instructions that accompany that kit, then continue with next step. NOTES: When the BAK is installed, the vent hose that terminated on the rear of the OEM airbox can be relocated in any safe position that does not kink or pinch it. It is important to verify proper throttle operation before starting the engine.

How To Adjust the Accelerator Pump On the 40mm Mikuni Carburetor

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Filed Under (Yamaha) by admin on 21-01-2012

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1) The “blue” colored screw in the image is the duration adjustment screw. Underneath the head of the screw is a lock nut and the bracket arm that the screw is threaded into. To decrease the amount of fuel squirted the adjustment screw is turned “clockwise” or in. To increase the amount of fuel squirted the adjustment screw is turned “counter clockwise” or out. To get the max, amount of decrease remove the screw and take the lock nut off of the screw. Then replace the screw into the cam arm, then replace the lock nut underneath the arm on the screw. this gives you another 3/32″ of an inch in which the screw can be screwed in.
2) Turn the adjustment screw fully clockwise or IN. Start your engine, Blip your throttle open, if the engine stutters, (hesitates), it is not getting enough fuel so turn the screw counter clockwise to increase the amount of fuel squirted from the accelerator pump into the carburetor. Keep blipping the throttle and adjusting the screw till the carburetor starts to cough. Stop here and turn the screw back in till the coughing stops. Tighten down the lock nut. This should give you the best throttle response with the least amount of coughing and backfiring out the carburetor. Timing Adjustment Screw This is the “Green” colored screw just above the Blue duration adjustment screw. The” Mucker” said it best,,,,, This upper screw adjusts the “timing” of the squirt. By altering it’s setting, you can advance or delay the onset of the fuel squirt. But probably, it won’t have to be touched

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