Product detail
Silver
Roller rocker arm:Aluminum Forging
Piston: Cast aluminum

[Specification]
Displacement: 181cc
IN: 25mm x 2 / EX: 21.5mm x 2
Valve Stem Shaft Diameter: 4.5mm for both IN and EX
Bore Diameter: 63mm
Stroke: 57.9mm (Stock)
Compression ratio: 12.5: 1

[Set components]
・Super Head 4V+R Big Bore Kit 181cc
・FI Controller TYPE-X
・Big Throttle Body Kit
・Large capacity injector
・Spark Plug
* For competition use only.
*When installing the Big Bore Kit, it is recommended to install SP Takegawa's Special Clutch Kit to prevent clutch slippage and various exhausts at the same time.
*The installation of FI-CON TYPE-X is subject to the user's PC or smartphone environment and internet connection.
*There may be changes in product specifications due to the manufacturer's reasons.

*Depending on the lot, the product may be delivered with the old price and label with the old JAN code before the price change..
Super head 4V+R (1 cam 4valve)
1 cam 4 valve head for easy handling and high power output!!!

The combo kit includes Super Head 4V+R Big Bore Kit 181cc, FI-CON TYPE-X, Big Throttle Body Kit, Large Capacity Injector and Spark Plug.

■Super Head 4V+R (1 cam, 4 valves)
Two intake / exhaust valves are used each to increase the valve curtain area and achieve high intake / exhaust efficiency.
The original head shape was designed to balance the center plug, valve pinching angle, combustion chamber shape, and port shape to achieve a higher output than the stock head.
The combustion chamber is finished with high accuracy by NC machining.

The highest class of SOHC intake and exhaust efficiency
Valve diameter IN: 25mm x 2 / EX: 21.5mm x 2
Valve Stem Shaft Diameter: 4. 5mm for both IN and EX
The use of unequal pitch valve springs prevents surging at high RPM.
The cylinder head surface is painted black.
Since the inspection breather cover is included, you can release the internal pressure of the engine by purchasing the oil catch tank kit separately.
Inspection breather cover, Inspection cover, L. Cylinder head side cover is made of die-cast aluminum with barrel polished finish.

Aluminum forged roller rocker arms
The frictional resistance with the camshaft is reduced, and smooth operation is realized!!! Maximizing the output and maintain the output in the mid to high speed range can be done.

■Camshaft / Cylinder / Piston
auto decompression camshaft
It is possible to start the engine smoothly without putting a burden on the starter.

All aluminum ceramic plated cylinders.
Bore Diameter: 63mm Stroke 57.9mm (Stock)
Ceramic plated cylinders have excellent durability, airtightness and heat dissipation.
Since the cylinder is equipped with an oil outlet to the oil cooler, the oil temperature rise can be suppressed by purchasing the oil cooler kit separately.
The surface of the cylinder is unpainted "silver".

Cast aluminum piston
Compression ratio 12.5: High comp specification with 1
Pistons designed for high performance and durability.
The piston top is NC machined for high precision.

■Valves / Valve Springs / Rocker Arms / Camshafts

■Valve diameter IN: 25mm x 2 / EX: 21.5mm x 2
Valve Stem Shaft Diameter: 4. 5mm for both IN and EX

■Unequal pitch valve springs: It prevents surging at high RPM.

■Forged aluminum roller rocker arms are used
The frictional resistance with the camshaft is reduced, and smooth operation is realized.

■Auto decompression camshafts (standard 10 / 10D camshafts)
Smooth engine starting is possible without placing a burden on the starter.

■Optional parts: 15 / 15D Camshaft
It improves the output performance in the mid to high RPM range.See the comparison graph.

■Super Head 4V+R Combo Kit 181cc
Combo kit comes with FI TYPE-X (Injection Controller), Large Capacity Injector, Big Throttle Body Kit and Spark Plug for fuel adjustment suitable for Super Head 4V+R Big Bore Kit 181cc engine parts.

■FI Controller TYPE-X
This is an injection controller that can be installed to the stock ECU with a coupler.
Because each MAP is preset according to each engine specification, it is possible to run only by selecting the MAP that suits the engine specification.
In addition, ignition timing, acceleration pump, dwell time, reactive injection time, ignition timing temperature compensation, engine temperature compensation, and vaporization time can be set.
Advanced players can enjoy the setting based on the existing MAP or create a new MAP.
It is possible to monitor tachometer, throttle opening graph and engine temperature by connecting to PC or smart phone even when engine is running.
Ignition mode can be selected from EASY and EXPERT.
In addition, the rev limit, pit lane limiter and real time MAP change function are equipped.

■Big Throttle Body Kit
You can enjoy the characteristic of the engine which turns without stress up to the high RPM range by maximizing the performance of the head.
Big Throttle Body Bore Diameter: Φ34
Air filter kit included