Hey, a friend of mine has had this tractor for years and last year his brother hit something in the lawn with the 3 pt. hitch mower and it has never been the same. It now is hard starting, VERY low on power, smoking black and has fuel running out at the exhaust manifold joints and spitting out the top of the exhaust pipe. Seems to me like a timing issue but it seems unlikely that it would jump a tooth without having severe issues. Is there a keyway on the fuel pump shaft/gear or is it a press fit like the Bosch P7100 pumps? Thanks guys!