Slowing down a 3 3/4″ with 33mm Home › Forums › Engine › Slowing down a 3 3/4″ with 33mm Search for: This topic has 6 replies, 4 voices, and was last updated 4 years, 4 months ago by Derrick Bailey. You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In