Below are the available bulk discount rates for each individual item when you purchase a certain amount
● The 164cc Flat Deck Big Bore Kit is pure racing DNA from the YUMINASHI PRO-SERIES which comes with a dome piston prepared for the stock PCX150 V1 & V2 / SH150i and VARIO 150 eSP head with 29/23mm valves!
The Flat Deck Light Bore Kit with larger water/coolant capacity has been developed by the Yuminashi R&D to have a cooler running engine which is able to run higher compression ratios without the fear of blowing head gaskets and to push the envelope on the durability and reliability side as much as possible with installing a entirely new very hard cylinder sleeve which comes directly from the Yuminashi racing series engines to avoid ovalisation, oil leaks and compression loss!...
With the 0.3mm thin copper head gasket you are ensured from the perfect seal, and the hard chromium plating layered (Cr) piston rings which are produced by very strict Japanese standards has excellent characteristics which combine the original properties of chromium metal with the advantages of erectro-deposits!
The main benefits from the chrominum plating layered piston rings are extermely high hardness of HmV (Micro Vickers), 800 to 1100 (cf. gray cast iron 220 to 270), high melting point of approx. 1800°C (cf. cast iron 1200°C), good thermal conductivity and corrosion resistance, a low friction factor and excellent wear resistance, such features are very effective in preventing piston ring wear.
The enlightened piston is made from A-grade materials and the piston skirts come with a molybdenum coating. The Anti-detonation grooves on the top ringland provide several advantages, which include further atomization of the combustion charge to prevent damage to the piston and ring caused by pre-ignition. These grooves also prevent carbon build up on the ring land which can cause the compression ring to stick in the ring groove.
The pressure seal groove will prevent gas build up below the top compression ring; these gases can cause the ring to lift from the ring groove. Unseating of the ring will result in compression losses and lower performance.
The valve pockets in the piston are prepared to run with your stock 29/23mm valves PCX150 V1 & V2 / SH150i or Vario 150 eSP head.
If you install the eSP150 engines Big Bore Kit, then we explicitly recommend to order also the PGM-FI Controller for your bike.
Based on our results on the Dyno we saw that you can't get your air fuel ratio right to make power with the stock 150 ECU....
More details about the PGM-FI tuning you can read over here...
365 DAYS FULL FACTORY WARRANTY (NOT FOR RACING USE...)
All prices are in USD