I have wanted to increase the power of the 2018 Honda Monkey 125cc engine for a while now. Originally I was just going to install a higher revving camshaft but heard I will loose power down low which I did not want to happen. Next option was a high compression 125cc piston and camshaft but I figured if I was going to install a new piston I might as well go with the 143cc big bore kit from Special Parts Takegawa. I have now finished install the supporting modification for the big bore kit so this kit will be getting installed soon. On first inspection of the kit it looks great. Comes with everything you need except a colder spark plug. I will review again after the installation is complete and motorcycle is running.
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