DROWsports Honda Grom/Monkey 181cc 4 Valve Performance Cylinder KitDROWsports LS 181cc 4v Head Big Bore Cylinder Complete Kit was designed for the Honda Grom and Monkey. We wanted to develop an affordable larger displacement cylinder and piston kit for KOSO 4 Valve Head. The design we've come up with utilizes that and has similar features to the 170cc piston and cylinder but offering more attention to detail. The KOSO 170 is great and we've loved pushing that kit to its limits, but we wanted a little more

High Quality Coating

This does not require any modification or additional components to make it run

It is easy to install and made specifically for non-EGR motors

stable data transfer for accurate calibration

Drive Belt Size: 842 x 20 x 30mm

Precision CNC machined aluminum construction with black anodized finish

giving riders the ability to manipulate lever position while riding

This is excellent for daily commuters who ride rain or shine

This allows the rotor to cool for performance and still have grabbed

The design allows for use of a footpeg on the front and the back

slammed street setups

we have something to fit your bike and carburetor combo