Hi dear friends! I think here are a good moped specialist users :), im cheeting with my bike, i have a problem with Piaggio Nrg 70cc, sorry about that. So, my scooter have a big big problem and i can't solved it. Last year i was driving all season with this carburater, the adjustment was very dificult for me, but i don't how i make it. In the end of season in october i broke my throtel line, than the problem starts. After replacing throtel line i opened carburater for cleaning, bye new float cap gasket....but i try for 5 days to adjustment now and it's inpossible for me. Bike starts, carburator is whit manual choke, starts, than works for a few minets, than rpm drop instant and turn of :(. So my carburetor is Dellorto 17.5 PHVA with 88 main jet and standart needle. Kit is a Dr Evolution 70cc and Leo Vince TT. Everythink was fine with this tuning parts until now :( So, what about smaller main jet ? I can't believed how is posible dificult are to adjustment this carburater. If i bye 19mm or 21 mm Dellorto ?
And some strange, the bike starts good only with fully opened rpm screw, almost to drop on the ground and mixture screw 3 times turnover ! (edited)