going to reassemble my engine and see what your thoughts are.bike ran when i got it,looked in ok shape.i rode it once a week.well anyway i decided to teardown and inspect,loooked ok for a 27yo machine.i wanted more power ,but no money.i found a takeoff e-22 head from ahp,looks goood,found that the camsprocket would not work,i believe 28t,v 32t was the diff,so i millled the bore on the cam sprocket so it would work for me,also removed some casting tabs on cyl head.seems like it will work.now port matching a klx110intake,and 22mm carb.i hope it works good with the new tb exhaust.oh yeah i have a take off 70cc cylinder kit to install too,milled head .010".anybody build something similar??then i will mod susp-forks,allow swinger,shocks,etc.i have been building up a stockpile of oem z50r parts to keep the going