my name is john brooks living in mid wales. I run a engineering company that make steel work for spiral stair cases and on the side I weld mot failures and fit out roll cages for rally cars. at the moment I have a dtr125 I am rebuilding for my sons birthday with a centre mounted exhorts with a foot cut off the total length of the bike. it has a 6 inch air filter and completely rewired. ignition is good but having problems getting my head around the lighting coils circuit.