just set them around 6 thousands. it will work. can set it a little tighter if you want. but this is a good setting to make it run. but the twin cam has a compression release in them. it works on the exhaust valve. make sure it works. if not. you need to remove the top cover. and check the...
these are adjustable. in the center of the rocker arm bolt. there is a Allen bolt. need to take a Allen wrench. and back it out a little. till it adjust it till it is ware you need it to be. do not need to turn it a lot. just play with it. and you can get adjusted to ware you need it to be.
THE NEWER BRIGGS DO NOT HAVE A DRAIN PLUG. LIKE THE OTHER PERSON POSTED. NEED TO SUCK IT OUT. OR TURN THE ENGINE TO DUMP THE OIL OUT OF THE DIPSTICK OR OIL FILL