Special Note: our pre-assembled complete cylinder head assembly has 2 SHORT STUDS that are too short for use on a power equipment (with a long plastic choke lever on its carburetor). If you use it for a power equipment, you probably need to use your own 2 longer studs on our product. We DO NOT accept any return without EMA number. Thank you for the interest in our products, welcome to coming and taking a look next time.