TAKEGAWA VM26 Carburetor Kit Instruction Manual

MIKUNI VM26 Carburetor Kit Instruction Manual

(For exclusive use in the Super Head 4VALVE+R-equipped motorcycle)

Item No.

：０３―０５―００３１ (Carburetor set)

：０３―０２―２５６５ (Manifold kit)

Compatible Models and Frame No.:

Monkey & Gorilla ：Z50J - 2000001∼2699999

Monkey R

：AB27-1000001∼ 1899999

：AB22-1000017 ∼

◎ Please note that, in some cases, the illustrations and photos may vary from the actual hardware.

Read all instructions first before starting the installation

◎ We do not take any responsibility for any accident or damage whatsoever arising from the use of the kit not in conformity with the instructions in the

 manual.

◎ We shall be held free from any kind of warranty whatsoever of products other than this product if the glitch takes place on the other products than

 this one after the installation and use of this product.

◎ This carburetor kit is for exclusive use in a motorcycle equipped with a TAKEGAWA-made Super Head 4VALVE + R Bore Up Kit and Bore Stroke Up

 Kit. This kit is compatible only with a stock engine and Super Head 4VALVE + R.

◎ Do the installation work correctly referring to the relative Honda’s genuine service manual for the above-mentioned compatible models.

◎Please note that this kit is designed for exclusive use in the above-mentioned compatible models and frame numbers only and that it cannot be mounted

 on other models.

◎ You are kindly requested not to contact us about the combination of our products with other manufacturers'.

◎ Setting of a carburetor must be adjusted depending on the natural phenomena like the weather, temperatures and barometic pressure, and machine

 and carburetor themselves. Arrange the setting to match the engine and other conditions. For your information, the carburetor is shipped out in a state

 described on page 2.

◎ In installing this kit, a stock throttle housing is not used. Therefore, a brake lever and others need to be prepared by the user.

◎This kit is designed for exclusive use in the closed racing. So, do not drive your motorcycle on a public road after the installation of this kit. Drive your

 motorcycle at a legal speed, abiding by the laws.

Caution

The following show the envisioned possibility of injuries to human bodies and property damage as a result of disregarding the following cautions.

・Make sure the engine and muffler are cool before starting the installation. (Otherwise, you will burn yourself.)

・Do the installation with right tools. (Otherwise, breakage of parts or injuries to yourself may take place.)

・Always use a torque wrench to screw bolts and nuts tight and securely to the specified torque.

  (Otherwise, these parts may get damaged or fall off, resulting in accidents.)

・As some products and frames have sharp edges or protruding portions, please work with your hands protected.

  (Otherwise, you will suffer injuries.)

・Before riding, always check every section for slack in parts like screws. If you find slack ones, screw them securely up to the specified    

  torque. (Otherwise, improper tightening may cause parts to come off.)

・Always use new gaskets, and seals. And check those parts to be reused for wear and damage. If you find worn or damaged parts, replace

  them with new ones.

Warning

The following show the envisioned possibility of human death or serious injuries to human bodies as a result of disregarding the following cautions.

・Always start the engine in a well-ventilated place, and do not turn on the engine in an airtight place.

  (Otherwise, you will suffer from carbon monoxide poisoning.)

・When you notice something abnormal with your motorcycle while riding, immediately stop riding and park your motorcyle in a safe place to    

  check what has gone wrong. (Otherwise, the abnormality could lead to accidents.)  

・Before doing work, make sure your motorcycle is secure on level ground for safety's sake.

  (Otherwise, your motorcycle could overturn and injure you while you are working.)  

・Check or carry out maintenance of your motorcycle correctly according to the procedures in the instruction manual or service manual.

  (Improper checking or maintenance could lead to accidents.) 

・If you find damaged parts when checking and performing maintenance of your motorcycle, do not use these parts any longer, and replace them

  with new ones. (The continued use of these damaged parts could lead to accidents.)

・As gasoline is highly flammable, never place it close to fire. Make sure that nothing flammable is near the gasoline. Since vaporized accumulation of  

  gasoline is at high risk of explosion, work in a well-ventilated place. (Otherwise, it may cause a fire.)

◎ Please be informed that, mainly because of improvement in performance, design changes, and cost increase, the product specifications and   

 prices are subject to change without prior notice.

◎ This manual should be retained for future reference.

- 1 -

∼ Kit Contents ∼

０９―０２―０２２１ Optional part

１

８

１１

０３―０２―２５６５

２

３

５

９

４

１３

６

７

１８

１３

１４ １５

１６ １７

１２

Throttle cable, 710 mm

０９―０２―００７１

Factory preset mode of the carburetor

Main jet

Pilot jet

Jet needle

Clip position

Throttle valve

Air screw opening

# 190

# 22.5

5E75

3rd from top

# 1.5

1±1/4 turns

No. Repair Part Item No.

1 Carburetor assembly

2 Inlet pipe

3 Insulator

4 Insulator band

5 Inlet pipe gasket

6 Cap screw, 6x15

7 Cap screw, 6x25

8 Fuel cock

9 Air filter

10 Throttle COMP.

11 Throttle Cable, 810 mm

12 Pair of throttle grips, for right- & left-hand

13 Fuel hose, 200 mm

14 Main jet, #180

15 Main jet, #185

16 Pilot jet, #17.5

17 Pilot jet, #20

18 Hex wrench, 5 mm

Part Name

1 03-03-0321

1 17112-4SM-T10

1 00-03-0210

1 00-00-0050

1 00-03-0007

2 00-00-0042

2 00-00-0089

1 03-03-001

1 03-01-1064

1

1 09-02-0081

1 09-02-0002

1 00-03-0203

1 00-03-0076

1 00-03-0077

1 00-03-0154

1 00-03-0155

1

1

1

1

1

1

1

1 in packs of

1

1

2

10

1

1

10

1

1

※Please note that in ordering repair parts, be sure to quote the Repair Part Item No. Otherwise, we may not be able to accept your orders.

 There are some parts, however, for which we are not in a position to accept your order in just the quantity to be used. In this case, please

 take them in the quantity packed.

VM26 Pilot Jet

Item No.

00-03-0151

Product Name

#10

00-03-0152

00-03-0153

00-03-0154

#12.5

#15

#17.5

00-03-0155

00-03-0156

00-03-0157

00-03-0158

00-03-0159

#20

#22.5

#25

#27.5

#30

VM26 Main Jet

Item No. Product Name

00-03-0060 #100

Item No.

00-03-0074

00-03-0061

00-03-0062

00-03-0063

00-03-0064

#105

#110

#115

#120

00-03-0075

00-03-0076

00-03-0077

00-03-0078

00-03-0065

00-03-0066

00-03-0067

00-03-0068

00-03-0069

00-03-0070

00-03-0071

00-03-0072

00-03-0073

#125

#130

#135

#140

#145

#150

#155

#160

#165

00-03-0079

00-03-0080

00-03-0081

00-03-0082

00-03-0083

00-03-0084

00-03-0085

00-03-0086

#210

#220

#230

#240

#250

#260

Product Name

#170

#175

#180

#185

#190

#195

#200

☆Setting of a carburetor must be adjusted depending on the natural phenomena like the weather, temperatures and barometic pressure, and machine and

 carburetor themselves. Arrange the setting to match the engine and other conditions.

☆ A standard air cleaner cannot be installed to this carburetor kit. Therefore, the engine will go wrong if water gets into the engine and please refrain from

 driving in the rain. Besides, before washing your vehicle, cover the carburetor with a plastic sheet or the like to prevent water from getting into the   

 carburetor.

- 2 -

∼ Installation Procedures ∼

Please check the kit contents.

In the case of Monkey R : In the case of Monkey R :

(Installation)

(Preparation for Installation)

○ Detach a seat, turn the fuel cock   ○ Pass the supplied throttle cable  

 off, detach a fuel tube from the  through the frame.

 Caution:Check that the engine

     and muffler are cool

     and that the

     motorcycle is secure

     on level ground!!

In the case of Monkey and

Gorilla :

Bolt

Fuel tube

 Caution: Apply the specified   

     torque.

 Torque: 5 N・m (0.5 kgf・m)

Screw, 6x25

COPY

 from the float chamber to a tray.

○Unfasten the inlet-pipe-tightening

 bolt and air-cleaner-mounting  

 bolts. Remove a throttle valve from

 a carburetor. Then remove the  

 carburetor with the air cleaner  

 box, the inlet pipe and all.

 carburetor,

 unfasten a fuel-cock-mounting bolt

 and a tank nut, and remove the fuel

 tank.

○ Loosen a band screw on the

 connecting tube of the carburetor,

 unfasten two bolts, and remove the

 air cleaner.

○ Pass the supplied throttle cable  

 through the lower throttle housing,

 and connect the inner cable to the

 throttle pipe. And attach the throttle

 housing to the handle with two   

 screws.

※ Apply grease to the rubbing

 surface of the throttle pipe, the cable

○ Attach a socket set screw, packed

 in the Cylinder Head Kit, in the case

 of the Moneky and Gorilla, to two  

 taps A, and in the case of the

○ Fasten the insulator to the inlet

 pipe with two socket cap screws.

○ Remove a top cover of the

 supplied carburetor, and pull out

 the spring and the throttle valve.

 Pass the inner cable of the throttle

 cable through the carburetor top

Air cleaner case

Screw, 6x25

 Caution: Apply the specified  

     torque.

 Torque: 10 N・m

       (1.0 kgf・m)

Inlet pipe

 Monkey R, to two taps B, on the

 cover and then through the spring.

 cylinder head surface to which to

 And compressing the spring, fix

 attach the inlet pipe, and tighten the

 the top cover to the throttle valve.

 screws to the specified torque.

 Fix the throttle valve to the

 carburetor by aligning a notch on

Screw

 Caution: Apply the specified   

 the throttle valve with the throttle

○ Remove a top cover from the

     torque.

 stop screw.

 carburetor.

 Torque: 5 N・m (0.5 kgf・m)

○ Unfasten two screws on the   

 throttle cable holder, and remove the

 throttle with the housing and all.

Ａ

Ｂ

Throttle cable holder

○Remove the throttle valve from the

 carburetor, and separate the  

 throttle valve from the throttle  

 cable. Then pull out the top cover

 from the throttle cable.

○ Unfasten a pan screw on the  

 throttle housing to remove the  

 throttle housing.

○ Referring to the service manual,  

 demount the engine from the frame.

 And with reference to the

 installation procedures for the

 Super Head 4VALVE + R, install the

 Super Head 4VALVE + R to the

 engine, and mount the engine onto

 the frame.

Ｂ

Ａ

○ Place an inlet pipe gasket between

 the cylinder head and the inlet pipe,

 and fix it by tightening 6x25 socket

 cap screws to the specified torque.

 Caution: Apply the specified   

     torque.

 Torque: 10 N・m (1.0 kgf・m)

In the case of Monkey :

○ Fit the carburetor into the    

 insulator, and fasten the

 carburetor with a clamp band.

○ Fix an ground wire to the frame

 with an air-cleaner-mounting bolt.

 Caution: Do follow the

     instructions in the   

     service manual.

     Be sure to tighten to the

     specified torque !!

Screw, 6x25

Inlet pipe

Screw, 6x25

- 3 -

○ Pull the choke lever to start the

 engine. Gradually push the lever  

 back and warm up the engine till the

 revolution becomes smooth, and

 finally push the lever back to its

○ Attach an air filter, which please

 fix by tightening a band.

○Adjust the free play at the throttle

 grip to be about 5 mm by turning

 the adjuster of the throttle cable.

Less free play

More free play

Adjuster

About 5 mm

COPY

 Snap the throttle a few times to  

 make sure that the throttle moves

 original location. In case the engine

 does not run idle after the warm-up

 of the engine, or the engine idling  

 speed is high, adjust the setting by

 turning the throttle stop screw.

○ Jetting and other set up with your

 engine specification, please do this

 set up at safe and closed area such

 as racetrack.

 smoothly without sticking and that

 the throttle valve is fully open.

※ Also check that the throttle has

 free play even when a steering

 handle is turned all the way to the

 right or to the left.

※ In some case, need to adjust the

 fuel cock mount angle.

 Warning:Care about torque  

     when you tight fuel

     cock nut. Over   

     torque may damage

     sealing.

○Insert a fuel tube and fasten it with

 a tube clip. Open the fuel cock and

 chock for gas leaks. (Do not leave

 the cock open for long time.)

○ Dispose of the blow-by gas from

 the crankcase by yourself.   

 (Some racing and regulations  

 specify the blow-by gas

 disposal.)

○ In sending back the blow-by gas

 to the carburetor, connect the  

 blow-by hose with the union on

 the air-filter.

- 4 -

Co.,Ltd.

 3-5-16 Nishikiorihigashi Tondabayashi Osaka Japan

TEL : 81-721-25-1357 FAX : 81-721-24-5059

URL : http://www.takegawa.co.jp

How to Set the Carburetor

・When the carburetor does not match the engine and the engine fails, the engine failures are caused by either too dense or too lean air-fuel mixture.

・The engine failure symptoms for the engine are as follows:

When the air-fuel mixture is too dense:

・The explosion sound with a dull thud continues intermittently.

・The engine malfunctions further if you use the choke.

・The engine malfunctions when you warm it up.

・The engine works well if the cleaner is detached.

・The motorcycle belches dense (or, black) exhaust gas.

・The plug smolders, getting blackened.

When the air-fuel mixture is too lean:

・The engine overheats somewhat.

・The engine starts working well If you use the choke,.

・The engine does not accelerate well. (No smooth acceleration)

・Revolutions change, generating weak power.

・The plug burns white.

  Whether or not the engine revolution is in proportion to the throttle operation

 ・When the acceleration is not smooth or even, make the air-fuel mixture dense.

 ・Make the air-fuel mixture lean when the engine revolution goes up heavily and belches black gas.

 The mixture ratio at this throttle position can be adjusted by the location of E-ring in the grooves. The air-fuel mixture becomes dense as the

 location of the E-ring moves down from the 1st to the 5th groove.

○Main jet (The throttle position at 3/4 - 4/4)

 The air-fuel mixture ratio at this throttle position can be adjusted by changing the number of the main jet. The larger the main jet numbers, the

 denser the mixture ratio becomes.

 In view of the engine and muffler specifications, select the most appropriate main jet to get the highest revolutions.

○Pilot jet (First of all, please adjust the air screw.)

 ・In case you have given more than three turns to the air screw to tighten it, use a pilot jet with a small number.

 ・ If you have tighten the air screw (clockwise) to the full, use a pilot jet with a larger number.

  Check whether you have made a right choice of the pilot jet by seeing if the engine starts up revolving smoothly from the idling to running

  at slow speed.

 ・When the engine revolves up unevenly, the pilot jet number is too small. (At idle)

 ・ When the motorcycle belches black exhaust gas and produces heavy exhaust sound, the pilot jet number is too big. (At idle)

 ・After replacing the pilot jet, you need to readjust the airscrew.

○ Air screw

 The air screw adjusts the air mass flow at the time of engine’s revolving at slow speed. (At idling)

 ・Give the air screw a right turn → The air-fuel mixture gets dense.

 ・Give the air screw a left turn → The air-fuel mixture gets lean.

 Loosen the tightened air screw back to the 1.5-turn position. And then from this position, give to the airscrew a right or left turn of 1/4 to 1/2

 till the engine revolves at the highest speed.

 Loosen the idle stop screw till you get the steady idling revolutions. And once again adjust the position of the airscrew to get the highest

 revolutions.

●On how the barometric pressure, temperatures and humidity affect the setting:

 ・At highlands or at high altitudes, the barometric pressure and air density go down and the air gets into the carburetor in less amounts.

  This makes the air-fuel mixture dense which was adjusted at low altitudes.

 ・Under the weather conditions with very low temperatures, the air density increases, which makes the air-fuel mixture lean.

 ・Under the rainy and humid weather conditions, the air density decreases, which makes the air-fuel mixture dense.

◎ Please be informed that, mainly because of improvement in performance, design changes, and cost increase, the product specifications and   

 prices are subject to change without prior notice.

◎ This manual should be retained for future reference.

Co.,Ltd.

3-5-16 Nishikiorihigashi Tondabayashi Osaka Japan TEL : 81-721-25-1357 FAX : 81-721-24-5059 URL : http://www.takegawa.co.jp