Big thanks for treats excellent customer service. I purchased the kit but the wrist pin was not included, they fixed the situation no problem and to my amazement the piston was already seated in the cylinder ready to go! That was awesome to begin with and made installation a breeze. Bolted on my QT no problem, be sure to pickup a YT60 head gasket and full gasket kit. With my boyesen reeds, YT60 kit here with QT50 head, BP6HS plug, Jemco Exhaust, and PW50 rear gear, my QT goes from 30ish to 40 something! AMAZINGGGGGG