My sapphire was fine when I tucked it away last year. It is now back on the road, but when the revs hit 4000 it holds back and coughs and splutters and miss fires. Any ideas?
mine did that,it was the threaded terminal that screws onto the top of the plug which the plug lead pushes onto,as you bought new plugs if they had screw tops did you check they were tight?
mine was popping and misfiring as i accelerated and the tops on the plugs were all loose tightened them up ran spot on after,something so simple can make you fear the worst