Mabye first dude put some worn out carb, or parts?? I dont like buying anything second hand, just me
I have been using SH for a long time and dont have much trouble, seal it and forget it, but one time I had a piston crack, started running all ereratic so pulled it apart and had a crack down the side of the piston. It was a new engine send it back and they fix no prob. like other guy says linkage endpoints?? Make sure the idle screw is only 1-2mm open at idle, try to pinch the fuel line if it dies right away wayy too lean, if it goes on forever and ever wayy rich bottom.