I just bought a 70s 6x6 Argo with new tires new chains new every thing pretty much. but when I put the original engine back in it (440 Kohler) the crank seals were shot .So I orderd a new Lifan 22hp v twin 4 strock for it . has anyone here ran a Lafin engine and are thy any good. PS I only paid $140 for the Argo.