HI was looking for some advice on a jap 2 stroke engine 80cc unit, has had a full rebuild new bearings seals rings etc , the problem i am having is general running , the carb has had a full service and check but on start up runs and over revs and does not respond to throttle openings properly, there are no intake leaks and all the usual areas have been checked.Carb is a simple amal unit.Float heights ok all jets clear , fuel flow ok air filter clean, any ideas helpful cheers craig