It is not the best. If you want to do a complete carburetor rebuild, get something else. My scooter is a C50 12V round headlight 88-89' with a Keihin PB46 AC DA7 carburetor and the tires matched except for the fuel filter, which doesn't fit. The spark plug also worked, but it doesn't indicate the number, so we're going blind. The needle doesn't fit either, so I used the old one.