Complete Engine Kit 138cc (Super Head-4V+R) / (5-Speed / WET Silver / Wire / TNC)

The Complete Engine is a high quality engine that has been assembled by SP Takegawa mechanics with proper control of each part.

■Super Head 4V+R (1 cam, 4 valves)
The four-valve design increases the valve curtain area and greatly improves the intake and exhaust efficiency.
Valve diameter IN: 21.5mm x 2/EX:18.5mm x 2 Valve Stem Shaft Diameter: 4.0mm for both IN and EX
The M8 spark plug is used for the optimum valve pinching angle and compact head.
Roller rocker arm:The friction loss is reduced and the cam profile is smoothly followed from low to high speed rotation.

■Auto Decompression Camshaft
Auto decompression function: The engine can be started with a light kick force even for vehicles with large displacement engines.The camshaft included with the complete engine is 88cc / 106cc Scat: 10 / 15D 124cc / 138cc Scat: 15 / 20D camshaft.

■There are four types of displacement to choose from: 88cc, 106cc, 124cc and 138cc scuttles.

■Cylinder & Piston
The 88cc is equipped with an aluminum steel sleeve cylinder, and the 106cc, 124cc and 138cc scuttles are equipped with an all-aluminum ceramic plated cylinder for superior durability, airtightness and heat dissipation.
SP Takegawa cylinders are equipped with a temperature sensor as standard.You can measure the cylinder temperature by purchasing SP Takegawa's built-in thermometer or thermometer.
Cylinder compatible temperature sensor for 88cc / 106cc Scat / 124cc: M5 Temperature Sensor
Cylinder compatible temperature sensor for 138cc scut: C1 adapter (07-04-0031) + M5 temperature sensor
Piston: The 88cc model uses forged pistons.The 106cc, 124cc and 138cc scats use cast pistons and the skirts are coated with molybdenum for better initial adhesion.

■The 88cc / 106cc Scat uses a reinforced crankshaft with a 41.4mm stock stroke.
The X-shaped connecting rod is made of forged material.It is lightweight and strong enough, and its buckling stress diffusion and torsional rigidity are greatly improved.
Surface shot finish.In addition, a special bearing with a larger inner diameter is used for the crankshaft journal bearing.As a result, the shaft diameter of the journal section, where the stress on the crankshaft is concentrated, can be increased from 20mm to 22mm to increase the strength of the shaft.
Moreover, the crank pin of the large end part is enlarged from stock Φ23.1 to Φ25.1 to increase the strength of the large end part.

■The 124cc / 138cc Scat uses a stroked crankshaft.
Special bearings with a larger inner diameter for the journal bearings of the stroked crankshaft are used to accommodate high power engines.
The shaft diameter of the journal section, where the stress of the crankshaft is concentrated, is 22mm to improve strength and durability.In addition, the crankshaft has been given a special surface treatment to further increase durability.

■Secondary kickstarter systems are equipped with crankshaft support adapters.
The crankshaft journal part has been changed from a 2-point support to a 3-point support to reduce the crankshaft shaking that occurs in the high output and high RPM range and to increase the durability of the crankshaft.Generator cover for crankshaft support adapter included.

■SP Takegawa's original reinforced crankcase is used.
SP Takegawa's reinforced crankcase is a high quality crankcase specially designed to increase the rigidity and detail of the crankcase to cope with the load on the crankcase caused by the larger displacement.
The oil pump is a crankshaft direct drive oil pump.Compared with the chain drive type reinforced oil pump, the discharge volume is about twice as large.The inner diameter of the breather pipe is 6mm as opposed to the stock 4mm in order to reduce the internal pressure of the crankcase of a large displacement engine.
The crankcase body is equipped with an oil jet mechanism that constantly sprays oil directly onto the small end of the connecting rod and the backside of the piston for lubrication and cooling.The transmission bearing is equipped with a special bearing hold plate for big torque.

■Super cam chain tensioner is adopted.
It follows the cam chain and maintains the proper tension.The tensioner arm is machined from ultra high strength duralumin material to increase the thickness of the arm body and also to increase the contact area to the push rod.
An oil hole is provided in the arm to lubricate the operating part.The surface is hard anodized.

■You can choose between two types of crankcase: primary kickstarter system and secondary kickstarter system.
The primary type kick starter allows the engine to be started by disengaging the clutch in any gear, and is recommended for racing use where a quick engine start is required when restarting.
In the case of a primary kick, the engine can be started without direct stress on the transmission.

■Reinforced clutch (Clutch specification and clutch cover differs depending on the choice of primary or secondary type)

■Special Clutch Kit for Primary Type Kick Starter System
Special clutch (wet type) only, with magnesium die-cast cover.The surface of the magnesium clutch cover is painted brown.The reinforced clutch uses 5 discs to eliminate clutch slippage that occurs in high power engines.
The clutch has a slipper clutch mechanism.The slipper clutch reduces the shock of sudden engine braking when downshifting at high RPM.The clutch cover is a patented clutch cover that allows for the installation of a thermostat.
Overcooling can be prevented by installing a thermostat unit (sold separately).Furthermore, an oil outlet is provided to allow oil to be taken out to the oil cooler.Clutch cable 850mm included.

■Special Clutch Kit for Secondary Kick Starter System TYPE-R (WET / DRY)
The TYPE-R has been downsized to reduce the rotating mass weight by approximately 12%.6 friction discs are used to achieve a 6-disc reinforced clutch.As a result, the clutch capacity is increased by approx. 20% compared with the standard product, and it is applicable to high power engines.
The clutch is without a slipper clutch mechanism.Right crankcase cover is made of die-cast aluminum with silver finish. Both WET and DRY are available in wire type and hydraulic type.
The wire type uses a light and smooth rack and pinion system.Clutch cable 850mm included.Hydraulic type includes clutch master cylinder, mesh hose (775mm) and banjo.
WET (wet): The wire type clutch cover is made of forged aluminum with a shot finish, and the hydraulic type clutch cover is made of machined aluminum with a clear anodized finish.
DRY (dry): Both wire and hydraulic clutch covers are machined from aluminum with a clear anodized finish.
The clutch cover for DRY (dry type) has more ventilation holes for better cooling effect.A set of rubber caps (sold separately) can be installed in the ventilation holes to prevent the noise characteristic of the dry type.
TYPE-R is equipped with an oil cooler unit (sold separately), which allows oil to be taken out to the oil cooler.

■TAF 5 Speed Cross Transmission (S Touring) It has high durability and excellent operability.S-Touring gear ratios are used for the complete engine

■Super Street Outer Rotor
It is capable of stable high power output for both street and racing use, while maintaining the same brightness of lights as stock for street driving and a charge level that compensates for the power consumed while riding.
The rotor made by SP Takegawa uses a medium size flywheel that is 50% lighter than the stock flywheel, reducing the load on the crankshaft while achieving both ease of riding and the necessary power generation.
Moreover, the position of the pickup is reviewed, and the best ignition timing corresponding to various displacement is set up, and the high power characteristic and the response that cannot be obtained by a stock rotor are enabled.

■SP Takegawa's original aluminum die-cast generator cover
The specification of the generator cover differs between the primary and secondary types.The primary type adopts a separate type drive sprocket cover, and the sprocket can be replaced by removing only the sprocket cover part without removing the generator cover.
The secondary type is buffed and clear coated on the aluminum surface.Also, the sprocket can be replaced without removing the generator cover.The generator cover for the secondary type has an integrated bearing for the crankshaft support adapter.

■Hyper C.D.I. included. Adopt the ignition characteristic suitable for the engine parts made by SP Takegawa.