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Brand new set of 2 auto chalk. This is a generic product that is compatible with carburetors for motorized bikes such as DIO, Today, and Zoomer. The role of auto-chalk helps to smooth start by adjusting the fuel and air formulation when engine starts. Please be careful when replacing old or broken auto-chalk as it can adversely affect the starting of the engine. This auto-chalk is a combination of quality and durability. Based on parts fitting case, it is designed to fit many motorcycles such as DIO series, Today, Zoomers, and more to ensure precise performance. Professional and experience required for first-time use, we recommend installing it at your local motorcycle shop. Start your motorcycle comfortably and be attracted by the sound of auto-chalk operation. This auto chalk will help you increase your convenience for touring and everyday use. Get a piece you can trust. Instructions not included. It is relatively easy to install, but please ask a professional to install. We strive to make our images as close to the actual product as possible, but there may be slight differences in the color of the actual product depending on your monitor settings, lighting in the room, etc. Compatible genuine product numbers: 16046-GFC-891, 16046-GFC-892; Size: Main body 1.7 x 2.7 inches (4.4 x 6.8 cm); Needle insert: 0.8 inches (20.0 mm); Tip 0.4 inches (10.0 mm).