This kit is nice but the piston head has recessed slots and if your spark or timing is off the valve can catch on the piston head and cause the intake valve to bend. This is something that something that sounds like a "burrrt" when giving some throttle between 1st and 2nd gear.. It's your valve catching the piston making that noise. I used a takegawa piston with the NEO kit and have had zero issues, however the Kitaco piston cost me a new head and revert back to Takegawa piston. Took the head off to assess the damage after the odd noises and it seems as if the piston is the culprit of the malfunction. The OS valves and the recessed slots might be a recipe for disaster but there are others who run this kit without any issues. I used to think Kitaco was made in Japan like Takegawa but recently learned that Kitaco is from Taiwan. I only speak of quality presented from these nations and not a biased opinion. However I suggest a CNC piston and or Takegawa piston instead of the Kitaco to run with the neo head. The crankshaft is nice.
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797.15 EUR (137,500 JPY)
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FITMENT
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glom
All JC61 models
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glom
All JC75 models
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MONKEY125
All JB02 models
Product detail
Aluminum cast iron sleeve cylinder
○Displacement: 181cc
Bore diameterΦ63
Stroke:57.9mm (Stock)
○Compression Ratio: 11.5:1
○Unleaded premium gasoline specification
**There is no decompression function.
*Installation requires recommended parts such as Big Throttle KIT (for NEO cylinder head), high-capacity injectors, I-MAP depending on the model of the bike.
*Unlike the conventional products sold in the past, the NEO Big Bore KIT does not come with injectors.For more information on injector combinations in addition to the optional I-MAP, please visit the manufacturer's website:Please look at the tuning menu page before purchase.
*FI controller such as I-MAP is required to use NEO Big Bore KIT.If the stock ECU is not used, the bike will not run properly and may be damaged.
*Because of the increase in power and torque, the maximum speed can be increased by increasing the front sprocket by 1-2T or decreasing the rear sprocket by 3 to 5T and increasing the gear ratio.The reduction ratio will vary depending on your preference, operating conditions, and the installation of a clutch with a different primary reduction ratio.
*All big bore KITs exceed 125cc and are for racing use only
*Product and compatibility data are current as of May 2023.The product may be subject to change without notice.
*Images may contain other colors.
*There may be changes in product specifications due to the manufacturer's reasons.
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Achieve powerful torque and exhilarating acceleration!
Big Bore KIT that incorporates more advanced performance and durability into its design concept.
The cylinder head with optimized combustion chamber shape is equipped with a highly efficient port shape and big valves.
The high camshafts and high compression pistons for each engine displacement will give you the best torque and flat acceleration.
*Installation requires recommended parts such as Big Throttle KIT (for NEO cylinder head), high-capacity injectors, or I-MAP depending on the model of the bike.
Vorsicht
* If there may be an instruction manual included, it will be written in Japanese.