View Single Post
Old 09-21-2010, 10:29 PM
  #2  
w8ye
My Feedback: (16)
 
w8ye's Avatar
 
Join Date: Dec 2001
Location: Shelby, OH
Posts: 37,567
Likes: 0
Received 4 Likes on 4 Posts
Default RE: back pressure question

The 91 's with a fuel pump did not have a pressure nipple on the muffler

The old original 90 four stroke did not use or need muffler pressure