2021 Kawasaki KX450 engine High compression engine, 14:1 carrillo piston, top and bottom assembly rebuilt 60 hours ago by a certified mechanic is what i was told. I drove to his place, saw it running in the bike and pulled it with him. He had all the right tools so i felt good. My plan was to get a bare frame and put it in a bike I wanted to build for a certain race circuit, since then I ended up buying a bunch if bikes. This engine is ready to go, adjustments were made from the guy while bike sat, as his son was hurt. Then a new bike was bought. Engine ran T-4 VP race fuel. I have a running video i took of it in the bike before we pulled. Zero hours on just changed new oil and filter. Engine sounded killer Tires not for sale Buyers responsibility to make sure this engine fits your bike. The measurements I have are for a cooler for it to be shipped in that someone shipped one in the past with 80lbs was wrote on top. Id also have no problem meeting up if you are somewhat local.