never had any problems with my 1900 ran on efi mapped by ahmed i batterd it dailey for 2 years loved the limiter only thing that broke was gearboxes lots of em i blew a cam running in (soft metal) took out a lobe called ian he sent me a new piper next day can only tell ya my experiences and they were all good i broke the engine and could still see the hone marks in the bores still alive now i beleive