Registered Forum User
Big Twin
Bikes: Ducati 749, Phil Read Replica, DD 620
Posts: 1,830
Join Date: Mar 2008
Location: Coventry
Mood: 2011 DD Class 'B' Champion
You may want to try a known good pair of igniter units. These control ignition advance and can seriously pull down the bhp. Happened on my 583 and also Guy Lachlan's. I sold him my good units and his bike was transformed.