you will need a new side cover gasket, or some silicone gasket maker for when you remove the side cover.
There is a metal arm that pushes againt the governer (usually) and it can hit the cam i do believe and ruin the motor. I would remove te arm aswell, cut the "flap off" and reinstall. This whole process should take abou1 1 hour for someone who has never done it.
Steps
1.Drain oil
2.Remove Side Cover
3.Remove Plastic Governor Gear (and washer behind it)
4.(OPTIONAL) Remove governor arm and cut flap off and reinstall
5.Replace side cover gasket
6.Re-Install Side cover
7.Fresh Oil
That's it, good luck, let us know if you have any problems. If so, Pictures are nice
