O ok well I was running it, and I dont know how to run the engine, or settings or w/e so i maxed out all screws (turinig to the right), and did a 3 and 1/2 turn the other way(the left). And the car finally stopped reving, and un reving like RUUUUUMMMMMMmmmmmmmmmmmRUUMMMMMMMmmmmmmmmRUMMMMMMM mmmm u get it. and also it stopped cutting out( I push the gas and the engine goes out.. So i began to run it and like 2 mins into it my engine revs like really high!!! And i push the gas and nonething happens, it just revs higher. So I pulled the fuel line to stop gas flow. And when i checked it, the piston was broke off. And dude how the frack do u put the pull start back on? When i put mines on I pull the string, and the gears and stuff dont move, but when i release it the gears and stuff move. GET IT? Thanx for all the help. I REALLY NEED IT!