I saved a 1993 xt 225 from my father in laws pasture, where it had sat for 10 yrs! No ignition rusty gas tank chewed up wires. After a new battery, sanded repainted gas tank, carb clean, fuel treatmentand i riggedd up a toggle switch to replace ignition. The bike fired right up but after a few months still smokes pretty bad and there is a rattle coming from the head. Any ideas that dont involve me doing a valve job?