V-Twin Forum banner

Question about rerouting breather line to air

5151 Views 11 Replies 6 Participants Last post by  Brand'd
I have a 98 evo head breather motor. To get rid of drippy air filter, I lengthened the outlet hose and ran under frame to the atmosphere.
I was wondering, since originally the hose vented inside air filtered area to carb, it was adding some air to the air/fuel mixture slightly? If you put your hand over the hose when engine is running, you do feel air pushing (and of course oil mist).
I wonder if it affects maybe the air/fuel mixture at idle or so?
I have noticed a little difference on cool damp morning lately.
It's a mikuni hsr42 out of the box for an evo (stage one style headwork and a ev27 cam)
I'm no official mechanic, I'm interested in others opinions
  • Wow
Reactions: 1
1 - 2 of 12 Posts
If you lengthen the breather line a bit and make a trap in it you'll minimize the oil spray.
At 5k miles she's still fresh. It should level out on her own
1 - 2 of 12 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.