54mm Stroke-Up Crank Shaft Kit 124cc (2B) Instruction manual(124cc/54x54)
Crank shaft kit

Crank shaft kit (a single item)

01-10-8032

01-10-0081

01-10-8042

01-10-0091

Crank shaft applicable models and frame Nos
6V Monkey/Gorilla（Z50J-1323947 〜 1510400）(L/G Crank)（Z50J-1600008 〜 1805927)
Monkey/Gorilla （Z50J-2000001 〜）
XR50R （AE03-1000001 〜）（AB27-1000001 〜 1899999） CRF50F（AE03-1400001 〜）
Monkey BAJA
Monkey R/RT

（Z50J-1700001 〜）（AB22-1000017 〜）

XR70R （DE02-1000001 〜）
CRF70F（DE02-1700001 〜）

Applicable cylinder head

01-10-8032
01-10-8042(Old-tyoe)Super Head / R-Stage+D Head / 17R-Stage+D Head / Super Head+R head / Super Head 4Valve+R HeadDOHC 4V+D Head / DESMO HeadCO

Thank you very much for purchasing our products.
Thank you so you will comply with the following matters at the time of use.Before installation, please check your always kit contents.
If there is a point of notice event, Please contact us the dealer of purchase.
◎ If the description, such as photos or Illustration different with this part.

☆ Please read carefully before use ☆

◎ The use of ignoring the instructions that are written in the instruction manual, if an accident or damage has occurred, we can notassume any responsibility for compensation.
◎ This product installation and use, when a problem occurs to after market goods, guarantee other than this product, also can notassume any in any such matters.
◎ If it was the case or mounting that has been processed like a product, it will not be covered under warranty.
◎ It is not possible to inquire of the combination of other manufacturers.
◎ This product is the above-mentioned vehicle exclusive goods.Is not possible attached to the other vehicle. Please note.
◎ Installation of this product requires removal and installation of an engine, and disassembly of a crankcase. Please prepare service
manual for an above-mentioned applicable vehicle, and work with enough care following the instructions in the service manual.
Besides, this instruction manual, as well as service manual, is prepared for persons who have acquired basic skill and knowledge
in tuning. We recommend those who are technically inexperienced or without right tools to ask a technically-trustworthy specialist
shop to do the work.
◎ This part is a product that was developed for the closed competition, please do not use public roads.
◎ Always use new bolts, nuts, dowel pins and packings. Never reuse severely worn-out or damaged ones.
◎ Use liquid packings at the specified points only, and never use them at unspecified points. Otherwise, the packings may oppilate oil
passages; it may break the engine in the worst case.
◎ Be sure to always use premium unleaded petrol. And make sure to check what kind of gasoline is remaining in the fuel tank.
Whenever regular gasoline is left in the fuel tank, always replace it with high-octane gasoline.
◎ Never use this kit on the point-ignition system motorcycle.
◎ Please be informed that what we can safely say is that the ignition system of this kit is compatible with ours and stock ignition
systems, because no data is available with us on the compatibility with other ignition systems. Therefore, please never use otherignition systems, which may cause technical troubles.
◎ Need to use the C.D.I.magnet kit.For 6V Monkey / Gorilla (Z50J-1323947 ～ 1510400) (Z50J-1600008 ～ 1805927).
When using the C.D.I.magnet kit, it will be a competition-only (Racing) parts that will not charge the battery and the lighting
accessories will not function.
6V’s Monkey / Gorilla Crankshaft and various Twin Spark Cylinder Heads cannot be installed with this parts at the same time.
◎ Output performance is improved by installing this product. Along with that, if you use it for a long period of time with a stock
crankcase, the strength will be insufficient.
We recommend to use our reinforced crankcase with this kit.
◎ Install an oil filter outside.
◎ Install an oil cooler whenever necessary.
◎ Engine oil must be API SF or higher class, such as SAE 10W-40 / 15W-50, which are our recommendations.
◎ The upper limit of the engine revolutions is 12,000 rpm. Please install a tachometer to ensure that you drive at revolutions below
12,000 rpm.
◎ Change the sprocket with the one which meets the output and specifications.
◎ This kit cannot perform on its own.
◎ This kit is only compatible with those engine parts recommended by us. So, please replace the engine parts not recommended by us
with those of our recommendations.
◎ The installation of this kit entails crankcase boring process. For the details, please refer to the attached sheet.
◎ Stock cylinder head cannot be used with this kit.
◎ Caution: Must be used with our applicable cylinder head kit and cylinder kit 124cc (54x54).
Cannot be combined with non-applicable cylinder heads and only work with 124cc (54x54)

PY

Jump-Starting and Sudden Acceleration
Idling, sudden acceleration, and sudden engine braking will put a heavy load on the engine, which please note may result in crank shaft damageand engine breakage in the worst case.

～ Features ～○ The combined use of this kit with the cylinder kit of our own make will have a remarkable effect, increasing the engine displacement to 124 cc.
○ The crank shaft is made light in weight via the introduction of the balance cut aimed at reducing waggling.
CONTACT Address : 3-5-16 Nishikiorihigashi Tondabayashi Osaka JAPANTEL: +81-721-25-1357 FAX:+81-721-24-5059 e-mail:english@takegawa.co.jp URL http://www.takegawa.co.jp
Please contact with your name and country name provided. (Only English please)2022.2.24

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Caution

When the handling of ignoring this display, property damage and human shows the assumption of what injury.

■ Since this kit is designed and developed for driving in closed races, do not use the kit for running on public roads. Always try todrive your motorcycle at a legal speed, abiding by the laws.
■ Work only when the engine and the muffler are cool. (Otherwise, you will burn yourself.)■ Prepare right tools for the work, and do the work in the proper and right way.
(Otherwise, improper work could cause breakage of parts or injuries to yourself.)■ Always use a torque wrench to screw bolts and nuts tight and securely to the specified torque.
(Improper torque could cause these parts to get damaged or fall off.)■ 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 thespecified torque. (Or improper torque may cause parts to come off.)■ Always use new gasket and packing. In case you continue using these parts, carefully check them for wear or damage, and in case wear
or damage is detected, always replace those worn or damaged parts with new ones.
When the handling of ignoring this display people died, shows the contents of the serious injury possibility is
assumed.
■ Always start the engine in a well-ventilated place, and do not turn the engine on in an airtight place.
(Otherwise, you will suffer from carbon monoxide poisoning.)■ When you notice something abnormal with your motorcycle while riding down a road, stop riding immediately and park your motorcyle ina safe place. (Otherwise, the abnormaility could lead to an accident.)■ Before doing work, place the motorcycle on level ground to secure it for safety's sake.
(Otherwise, your motorcycle could overturn and injure you while you are working.)■ Check or perform maintenance of parts correctly according to the procedures in the instruction manual or a service manual.
(Improper checking or maintenance could lead to an accident.)■ If you find damaged parts when checking and performing maintenance of your motorcycle, do not use these parts any longer, and replacethem with new ones. (The continued use of these damaged parts as they are could lead to an accident.)■ 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.
WarningCO◎ Please note. Performance up, the design change, the product and the price in the cost up, etc. are subject to change without notice.
◎ Please be informed that we shall be held harmless against any claim against us whatsoever arising out of use of the products in
racing and the like.
◎ Keep this manual stored until this product is discarded.

● Cautions before riding

PY○ Our products that cannot be used

① On fuel to use
Whenever regular gasoline is remaining in the fuel tank, always
replace it with high-octane gasoline.

◇ On the use of old-type inner rotar C.D.I.
Usable② On sprocket change◇ The installation of this kit will increase the power of yourvehicle. So use of a stock sprocket will result in severe wearsof parts because of the too low gear, not only adversely affecting
the engine life, but also breaking the engine in the worst case.
Please get your sprocket high-geared.

● Engine parts of our recommendation※ This kit is compatible with the engine parts of our recommendations
only. Therefore, please replace the engine parts not recommendated
by us with those of our recommendations.
Also, it cannot be combined with pistons / cylinders other than
124cc (54x54). Be careful.

Applicable cylinder head
(Displacement)

ClutchIgnition system (12V)
Ignition system (6V)

Recommended parts
R-Stage+D Head (124cc)
17R-Stage+D Head (124cc)(Old-type)Super Head (124cc)
Super Head+R Head (124cc)
Super Head 4Valve+R Head (124cc)
DOHC 4V+D Head (124cc)
DESMO Head (124cc)
Our Special clutch
Our Dry-type clutch
Stock + Stock C.D.I.
Stock + Hyper C.D.I.
C.D.I. magnet kit
Super street outer rotor kit
C.D.I. magnet kit

Not usable

Only one tap for
installation

Tap for 88

Tap for 106

Please never use an old-type unusable base plate,because the use of it as it is is at high riskof causing troubles. So, change it with the oneof our recommendations.

● About the case of using 5-speed transmission◇ In case you install a 5-speed transmission kit and your kickstarter spindle is type A, make sure to change the spindle totype B spindle. This will improve the efficiency in transmitting
the torque at the time of kick start and reduce the load on thegear which will lead to the prevention of gear breakage.
◇ It is necessary to change a kick starter pinion as well at the timeof changing the kick-starter spindle type B. Change it with theright one with the number of teeth to match the transmission kit.
Please take note that the kick starter pinion type A is unusable.

Type A
Kick starter pinion

Kick starter pinion

For details, please refer to our parts catalog or website.
Please purchase the recommended parts described in the cylinder
head kit.
URL：http://www.takegawa.co.jp
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01-10-8032,8042

Type B
Parts Name
Kick starter spindle kit (Type-B)
Kick starter pinion (25T/Type-B)

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Item No.
02-04-0011
00-02-0105

The ignition systems with faster ignition timing ● Number of revolutions◇ The upper limt of revolutions varies depending on the installed
than our settings are excluded. So please never
cam shafts, cylinder heads, etc. Please install a revolution
use ignition systems in combination with othercounter to make sure that you drive the engine at revolutions
manufacturers’,which may cause technicalbelow the upper limit, following the instructions for a cam
troubles.
shaft or cylinder head.(Upper limit 12000rpm)● Others① Oil cooler
The installation of this product increases the heat releasevalue of the engine, set off by the increase in power. For along-time and high load running, we recommend you to installan oil cooler kit which keeps oil at appropriate temperatures andprevents such troubles as oil film shortage at high temperatures.

◇ Take note that idling and sudden acceleration in the 1st andthe 2nd gear particularly tend to exceed the the upper limit.
Over revolutions will result in nonsmooth revolutions of theengine, not only adversely affecting the engine life, but also
breaking the engine in the worst case.

② Thermometer
It is advisable to use a thermometer to control the oil temperatures.
For details, please refer to our parts catalog or website.
URL：http://www.takegawa.co.jp

CO

Product content

01-10-0081（for 6V）
01-10-0091（for 12V）

A

01-13-20（for 6V）
01-13-21（for 12V）

1

2

A

B

4

PY

3

7

5
6

5
6

00-01-0020

8※ Please order in the repair parts are always repair part number.
If it is not the part number order, you may not be able to order.Please be forewarned.It should be noted,
In the case of parts that can not be separately shipment, please order a set part number.

01-10-8032（for 6V）
Number
1
2
3
4
5
6
7
8

Product content
54mm Crank shaft ASSY.

01-10-8042（for 12V）

Quantity1

Woodruff key, 3x5
Crank case gasket (6V)
Right-side crank case cover gasket
Stud bolt A, 6x202
Stud bolt A, 6x194.5
Dai-Hard α Cam chain (84L）
Cam chain guide sprocket spindle

1
1
1
2
2
1
1

Number
1

00-01-0055
00-01-1032
00-01-0095

2
3
4
5
6
7

00-01-0020
01-14-0003
14675-035-T00

Number2022.2.24

Item Number

Product content

Product content
54mm Crank shaft ASSY.
Woodruff key, 4mm
Crank case gasket (12V)
Right-side crank case cover gasket
Stud bolt A, 6x202
Stud bolt A, 6x194.5
Dai-Hard α Cam chain (84L）

Quantity

Item Number

A

Crank side bearing

200-01-0045

B

Timing sprocket, 14T

100-01-0293

01-10-8032,8042

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Quantity
1
1
1
1
2
2
1

Item Number
00-01-0011
00-01-0096
00-01-0095
00-01-0020
01-14-0003

Boring of a Crankcase◇ To those who ask other specialist shop than us to do the work
○ Joining the cylinders together, process the crankcase little by little until the size is φ 56.8 ～φ 57.0 mm with a crankcase gasket
placed in between.
※ Processing of the crankcase will thin the thinkness of wall adjoining dowell pin holes. So the durability of the crankcase will be
reduced, resulting in the damage of the crankcase in some cases, which please take note.

CO
24 ± 0.1

Dowel pin hole～

26 ± 0.1

φ
5
φ 6.8
57
.0

22.5 ± 0.1

Gasket24.5 ± 0.1

Dowel pin holePY
27 ± 0.2

Caution○ Since crankcase boring thins the wall thickness and reduces hardness, be careful in tightening stud bolts.
○ Please take note that in some cases the crankcase may get damaged during use.
Furthermore, please be informed that we shall assume no liability to users for compensation or damages whatsoever of any kind.

◇ Please see and ask about the crankcase modification work.

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■ Mounting procedure※ Please refer to the Genuine Service Manual for detailed mounting methods and specified torques that are notspecifically described.

Removal∴ Do the following work
referring to the relative
service manual.
○ Referring to the service
manual,dismount the engine
from the frame.
○ Referring to the service
manual,disassemble the engine,detach the stator plate, andthen disassemble the crankcase.

○ Get the boring process done tothe crankcase.
Get the boring process done tothe crankcase, referring to theattached sheet.
○ Enlarge the orifice diameter on
the right-side crankcase
referring to the instruction
manual for Super Oil Pump.

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Installation○ Clean the crankcase.
○ Install the cam chain guidesprocket and the spindle.
○ Apply engine oil to thebearings in the crankcase.
○ Install the transmission andthe gear shift drum to theleft-side crankcase withreference to the instruction
manual and the service manual
for the transmission.

○ Attach kit’s gasket to the
crankcase, and install theright side crankcase.

∴ 6V vehicle○ Remove the oil pump.
○ After removing the kickstarter spindle, remove thetransmission and the gear
shift drum as they are.

○ In the case of a 6V vehicle,
change spindles from a cam
chain spindle to a spindle ofthe kit, and install it.

Sprocket○ Remove the crank shaft.

Cam chain guidesprocket spindle○ Remove each part on the cam
chain tensioner and the guideroller from the crankcase.

○ Install the starter spindle.

○ After applying a little Alumi
Special to the threaded
portion of the crankcase
bolts, install the bolts onto
the crankcase and tighten
them diagonally to thespecified torque.
Note: Be sure that you
protect specified torque.
Bolt

PY○ Pour engine oil from the rightside of crankshaft assembly of
the kit. and let the goodenough oil into the bearing at
the end of the connecting rod.

○ Apply engine oil to thejournal bearing.

Torque：9.8N・m（1.0kgf・m）○ Being careful of thedirection of the gear shift
drum washer, tighten it to
the specified torque with ahex bolt, and attach a rubber
plug.
Note: Be sure that you
protect specified torque.
Hex bolt

Torque：11.8N・m（1.2kgf・m）○ Attach the crank shaft onto
the crankcase, and fix dowelpins into the crankcase.

○ Remove the stud bolt from thecrankcase.

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■ Mounting procedure※ Please refer to the Genuine Service Manual for detailed mounting methods and specified torques that are notspecifically described.

○ Flatten the surface by
cutting off the hole sectionof the crankcase gasket andthe mating surface of thecylinder.
※ Be careful not to get any
gasket chips in the
crankcase.

○ After applying Alumi Special
a little to the threaded partof the stud bolts,attach studbolts to the crankcase,andtighten them to the specified
torque. Attach the short studbolt A 6x194.5 to the R. crankcase(clutch side).
Anti-seizure agent:08-02-0042
Note: Be sure that you
protect specified torque.
Stud bolt○ Degrease the tapers on the
flywheel of the crank shaft, andinstall the flywheel.
After applying screw locking
agent a little to the washers
and flange nuts, tighten them tothe specified torque.
Recommended: Loctite 243☆ Specialized Tools● Con’rod stopper
Item No.:00-01-01

Note: Be sure that you
protect specified torque.
Flange nut

Torque：44N・m（4.5kgf・m）

Torque：9.8N・m（1.0kgf・m）

CO● Lock nut wrench, 20x24
Item No.:08-02-0033
12.7mm (1/2）：08-02-0034
9.5mm (3/8)○ Install the parts on thetransmission with reference
to the instruction manualand the service manual forthe transmission.

○ Install the cylinder,following
the cylinder installation
procedures.

○ Fit a kit’s Dai-Hard α cam
chain in the crank shaft, andinstall the tensioner roller.

○ Fix the oil filter screen, andinstall Oil Pump referring to
the instruction manual.

○ Install a clutch withreference to the instruction
manual for the relative
clutch kit.

6V vehicle

PY● Flywheel puller SET
Item No.:00-01-031○ Follow the instructions of our
C.D.I.magnet kit to install.

12V vehicle○ Attach O-rings to the two
spots.

○ Fix a generator plate, andtighten the flat screws.

○ Fix the woodruff key to the
crank shaft.
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B/2● Universal holder
Item No.:00-01-1002

INSPECTION / SERVICE LIMITSWARNING：Since this inspection manual is prepared for those who have acquired basic skills and knowledge intuning, those who are technically unskilled or inexperienced are required not to do the work.
Reference Value List for Cylinder head Maintenance
Item
Service limit
Internal diameter of con'rod at small end
13.03mm
Clearance between con'rod's small end and a pin
0.035mm
Misalignment on con'rod's big end longitudinal and transversal direction
0.05mmSide clearance
0.6mm
Free play on the journal bearings in the direction of shaft
0.1mm
in the direction of bearings
0.05mmCrank shaft deflection
0.1mm

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○ Inspection of Crank Shaft
・Check the crank shaft for damages on the flywheel-mounting
surface.
If there is a damage, replace the flywheel and the crank shaft.

Tapered surface

・Measure the internal diameter at the small end of the con’rod.
∴ If larger than 13.03mm, replace it.

・Measure the clearance at the big end of the con’rod in the axial
direction.

∴ If larger than 0.6mm, replace it.

・Measure the misalignment at two points at the big end of the
con’rod at right angles to the shaft as shown in the figure on
the right.

PY
Y

X

∴ If larger than 0.05mm, replace it.

・Measure the misalignment on the journal bearing of the crank
shaft.
∴ Shaft direction:If larger than 0.10 mm, replace it.
Bearing direction: If larger than 0.05 mm, replace it.

・Measure the deflection of the crank shaft.
∴ If larger than 0.10 mm, replace it.

26mm

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30mm

Remarks
Replace
Replace
Replace
Replace
Replace
Replace
Replace