Damage to the parts due to technical or knowledge problems may lead to injury or death due to a fall. *When installing this product, be sure to install the Enigma Endurance Specification (EE). *In case of not installing EE, since the fuel will not be enough and the actual performance will not be demonstrated.In the worst case, the engine may be damaged.Conventional F.I.B PRO cannot be used. *This product is exclusive for Endurance 170CC Big Bore Kit.
The head is of course, a 1 camdhaft for 4 valve. Here's the answer to durability and high output! Endurance hi-POWER 4Valve Head Kit!
[Features] 1: 4-valve head The intake air volume is increased by more than 50% compared to stock by changing to 4 valves! Spark flag is in the center. The shape of the combustion chamber and the intake and exhaust ports have been optimized, resulting in a significant increase in power output.
Stock part is IN: Φ25.5, EX: Φ21 for one each, lN: Φ24 x 2 bottles, EX: Φ21 x 2 bottles. In addition, the stem shaft diameter is Φ4.5 (stock: Φ5).
2: Intake port ・The oval intake port has been redesigned and optimized for 4-valve use! ・The intake manifold is also specially designed to fit the oval shape for smooth air intake!
3: Dedicated manifold ・An oval shaped manifold is installed to match the intake port.This is only for Big Throttle Kit.
4: Large capacity injector ・Increased output by 4V head! ・The injectors were enlarged to match the intake air volume! ・Dedicated MAP is built into Enigma Endurance specification (sold separately).
5: Aluminum casting biston Specially designed pistons for the 4V.The high compression ratio of 12.5 is achieved by combining lightness and strength. Lightweight and strong enough to withstand the high power output of 4V pistons can only be achieved with cast pistons.
By adopting a special casting material, it succeeded in getting strength and lightness that cannot be achieved by a general casting material machining method, and in significantly reducing the weight error. It is easy to see which is more suitable for tuning engines: cast pistons, which give the highest priority to productivity (cost), or forged pistons, which give the highest priority to strength.
6: Riken Piston Rings The piston ring is made by Riken.
7: Cast aluminum roller rocker arm ・The rocker arm is made of cast aluminum to achieve both lightness and strength! ・The roller rocker arm reduces the frictional resistance with the camshaft and increases the power output!
Points of Attention
* If there may be an instruction manual included, it will be written in Japanese.
About quality and texture: I am happy with the quality of this 4V 170cc big bore kit. The cylinder is all aluminium without a steel sleeve and the piston is aluminium but forged and not cast like the cheaper kits would tend to include but the part that makes this big bore kit special is the 4 valve head.About the feeling of use: With the massive increase in the piston size and the addition of valves in the head this big bore kit delivers a huge increase in power and makes the Monkey 125 a beast to ride.Products to buy together: An advanced fuel controller is needed to purchase together with this big bore kit to be able to tune engine once the build is complete. aRacer is a great option but not available here on Webike to suit the Monkey 125.Difficulty of installation: The process to install takes about two hours and that includes checking all the ring gaps and adjusting before assembly. A little difficult to do but the Honda service manual has all the information to help you get the job done.Cost performance and comparison with other products: Great costing as you are getting the best bang for buck 4 valve head big bore kit out there and the quality is outstanding as compared to the much more expensive Takegawa kit that is slightly larger in capacity but does use a cast aluminium piston.About shipping and packaging: The faster shipping options are too expensive for myself so I just have to wait for my part to arrive via sea freight. Webike kept me updated on the status of my order up to when it shipped. The parcel arrived within the expected date range and was well packaged with no chance of the part being damaged.Any concerns, cautions, or advice when purchasing: The big bore kits with the 4 valve heads are more maintenance intensive and require all the supporting modifications to create a reliable engine.View Detail
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