hello Im new to this forum malarky,I ve just bort a shineray 125 its well looked after does 65 mph on flat which is fine, that said I am going to change the drive sprocket first to see what happens then maybe wheel sprocket. what Im more concerned about is the bike is fitted with a k an n air filter which is causing a flat spot at the start of revving the engine, you can hear the air being sucked in so I am assuming this is making the mixture weaker and hence the flat spot (tick over is too low as well and it cuts out unless revved) could somebody tell me what has to be adjusted on the carb please and where the screws are located. thanks
Retro.