The leads come out the same as if you are unscrewing a bolt.They screw in and out the same way.I really don't think your getting a accurate reading by making something to fit you will be making it harder for the current to flow.The reason the back sparks easier is cause it's closer to the coil.You have to remember with electricity current will flow easier via the quickest path and less resistance, which is via the rear,as it is closer to the coil.Fitting a wire which is possibly not a coil wire and adding a join will create more resistance.So try and unscrew the coil wires and use the leads,this also will show how good the leads are.There is no way the front cylinder can suck more than it needs to start.It is defiantly a firing problem not a fuel problem.The inlet is exactly the same set up as a 160cc engine.It doesn't require more fuel than a 160 in fact they use less,as there is two cylinders doing the job of one.Which in tern gives it more torque.Remember they are actually a 166cc engine not much more than a 160.So it defiantly sounds like an electrical problem to me.We just have to work out what exactly.
