I never had a torque wrench nor a impact on mine I always tightened it by hand but this poor machine was sadly abused by the previous owner/owners, I mean hey I did get it for a couple hundred bucks so far I have done the following since buying it a few months back. Complete top end, cylinders,pistons,rings,gasket kit,reeds and cages,filter,tors removal,bearings all the way around,just installed a seal behind the sprocket, installed a new chain and sprockets,complete swing arm rebuild kit with new carrier,head pretty soon I should have a brand new machine HAHA. I also installed tors removal kit aswell tires all the way around but hey for 400 bucks I couldn't complain I guess.