Re: Backfire through carb under load
sounds like an accelerator pump issue to me.<br /> either the pump arm is not in the correct hole or the check ball in the passage just beside the needle valve tower under the screw is not seating or the vents for the pump passages in the airvalve assy is clogged. if it only backfires on rapid throttle opening but not during a steady speed I would double check the accelerator pump circuits.<br /> on rapid throttle opening that engine requires a vary large shot of extra fuel or it goes "pop".
sounds like an accelerator pump issue to me.<br /> either the pump arm is not in the correct hole or the check ball in the passage just beside the needle valve tower under the screw is not seating or the vents for the pump passages in the airvalve assy is clogged. if it only backfires on rapid throttle opening but not during a steady speed I would double check the accelerator pump circuits.<br /> on rapid throttle opening that engine requires a vary large shot of extra fuel or it goes "pop".