X-PRO^® 52.4mm Cylinder Head Assembly for 110cc ATV Dirt Bike Go Kart
[304-999003]

Cylinder head fit Apollo 110cc engine (125 model) with 2 exceptions; new Timing gear was smaller, less 3 teeth than apollo original part. I was able to carefully bolt up and use the old gear in the new head. Also The cylinder cap 4 bolt holes were machined too small and required drilling. Besides these 2 modifications, the cylinder head worked perfectly. I wouldn't expect perfection from Chinese parts and price was cheap.