i am guessing that is a Kioritz engine with a Walbro diaphragm carb. If it has been sitting for long, the fuel has gummed up the carb. The first short cut to try is to back out both mixture screws if present, and you may need to remove limit caps, and start it and run it wide open popping the choke open and closed to try to flush out the carb with fresh fuel. If it will stay running after doing this, then readjust by setting the idle screw and low speed screw, which is the one closest to the engine, until you have a smooth idle, and the engine will accelerate smoothly. Sometimes that means setting the L screw a tad rich (open) to help the engine accelerate. The mixture screws are needles that regulate fuel flow, so unscrewing a mixture screw, or opening it up, will let more fuel flow, making the mixture richer. If you can tune the idle to run smooth, then hold the engine WOT (wide open throttle) and adjust the H screw, which is closest to the air filter, for max RPM, which will be found by turning it in slowly and listening very carefully to the engine. This is best done with a tachometer. Be very careful here as you can run the engine to lean and damage it. As you screw in the H screw the aRPM will go up until it gets too lean, and then start to fall of as there is not enough fuel. Back it out until it runs smooth again, then back it out rich another 1/4 to 1/2 of a turn rich to provide adequate fuel for horsepower and cooling.salarmi said:Just got a mantis rotiller will start and only run when choked or 80% chocked any ideas what I need to do ?