I thought it was a piston that comes with a kit without a hole on the suction side in the photo, but it was a type with holes. The piston that is in use now is a hole that can be opened close to genuine on a thing without a hole, but I can not say nothing because I have not used this type yet. The part of the head is slightly bigger and slight compression may be lowered. Since I am not using it, I can not say anything, but please change the photo if the product changes. I will make a mistake. When I asked a question to the monotaro, it was that the hole opened for measures against heat. I feel that the hole position is too low ...
The product itself is fine. However, the weight of the piston of the domestic boa up kit is fairly heavy, so the vibration of the engine has become big. Due to its thick wall, the durability will have increased, but I am worried about the influence on other parts. Although I am running about 1000 km after installation, the problem has not appeared so far.
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