Hi, can anyone help me. Bike is on 1 cylinder & speedo keeps altering as it's ridden. Fetched the injector rail out & ran engine, one injector just sprays fuel constantly, swopped the injector & the replacement one does the same thing. Help!!! Bike is a "52" plate & has been starting up on 1 then 2 then 3 as it warms up for a week or so, thought it needed plugs, but made no difference.