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GhostBikes.com£159.99Visit shop Naraku Nk600.73 - 150Cc Cylinder Kit 60Mm For Hm Moto City 125 2013
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This Naraku 150cc Cylinder Kit (60mm bore, part number NK600.73) is designed for riders looking to enhance the performance of specific 125cc Yamaha models (like X-Max, WR, YZF-R) and other mopeds with a YI-3 engine. Its key benefit is increased displacement and potential power output. A crucial caveat is the mandatory adjustment of the cylinder head's squish edge if the original head is used, and re-tuning of the carburetor or injection system is essential for optimal performance and engine health. The kit includes all necessary seals and small parts for assembly.
| Model Part Number | NK600.73 |
|---|---|
| Brand | Naraku |
This kit is designed for 125cc mopeds featuring the YI-3 engine, including specific Yamaha models like the X-Max, WR, and YZF-R 125cc.
You can use your original cylinder head, but it is mandatory to correct the cylinder squish edge by using appropriate foot gaskets. Using the matching Naraku cylinder head (NK600.75) is recommended for easier installation and optimal performance.
Yes, re-tuning the carburetor or injection system is mandatory to correctly match the increased engine displacement and ensure proper operation and longevity.
The squish clearance is the gap between the piston and the cylinder head at Top Dead Center. Correcting it ensures efficient combustion and prevents the piston from contacting the head, which could cause severe engine damage.
The kit is delivered as pictured, including all seals and small parts necessary for assembly. Detailed installation manuals are typically available from the manufacturer or specialized service guides.
The kit increases displacement to 150cc, which typically results in improved acceleration and a noticeable increase in overall power and torque. Specific gains depend heavily on proper installation and fuel system tuning.
Installation requires mechanical expertise, especially regarding cylinder head modification and fuel system tuning. If you are not experienced, it is highly recommended to have a professional mechanic perform the installation.
Verify fuel system has been correctly re-tuned. Check for spark and ensure all electrical connections related to ignition and fuel systems are secure.
The carburetor or EFI system requires further adjustment. Check for air leaks around the cylinder base and head. Ensure the air filter is clean and not restrictive.
This often indicates an incorrect air-fuel mixture (too lean) or insufficient squish clearance. Re-check fuel tuning and cylinder head squish measurements. Ensure cooling system is functioning correctly.
Check for incorrect squish clearance, detonation due to improper fuel tuning, or loose internal components. Re-verify all installation steps and tuning parameters.
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