Jump to content

  • GUESTS

    If you want access to members only forums on HSO, you will gain access only when you Sign-in or Sign-Up .

    This box will disappear once you are signed in as a member. ?

re-jetting for aftermarket pipes

Steve Bakken

By Steve Bakken
in Motorcyclists

 Share

Recommended Posts

Steve Bakken Proficient

Steve Bakken

Posted
Posted

So the bike I bought this spring has a set of cobra pipes on it. It's an 01 Honda Sabre 1100. I would hope and assume that the previous owner re-jetted for the increased flow, but during decelleration it crackles and pops---alot. Not sure if this is indicative of a lean condition or not. Anyone have a rule of thumb as to how many sizes up from stock a guy needs to go with aftermarket pipes?

Link to comment
Share on other sites
osok Enthusiast

osok

Posted
Posted

Check out Cobra HSOforum, would help if you knew what model of pipes were installed but surfing around you should get an idea. I installed new pipes (V&H) on my Suzuki last season and it was recommended I install @least a stage 1 carb kit.

But back to focus....... Popping @ deceleration sounds like a lean burn condition, Crackles....well that could be just be the pipes themselves. I don't know of a good rule of thumb for this, but I'll be watching this post to see if a guru steps up.

Good luck.

Link to comment
Share on other sites
PierBridge Grand Master

PierBridge

Posted
Posted

I would contact the exhaust system manufacturer for starters. They should be able to provide you with technical information specifically for your application. You may, or may not, have to re jet the carbs.

Also there are TON's of Honda forums out there with some serious bike Guru's hanging willing to help. I agree it does sound like a possible lean conduction.

Link to comment
Share on other sites
snapjigger Collaborator

snapjigger

Posted
Posted

Just adding pipes should not require you to rejet. You should be able to just adjust your a/f screw. If you want to check to see how your running, get out on an open stretch. Run at 50+ for a bit then pull in the clutch as you hit the kill switch. Pull it over and pull a couple plugs out to sere what they look like. If you are running lean they should have a white look to them. Rich or fat and they will be dark. Hope this helps. Scott.

Link to comment
Share on other sites
Macgyver55 Grand Master

Macgyver55

Posted
Posted

Just adding pipes should not require you to rejet.

Its totally dependent on the pipes, each one is different depending on the backpressure. Judging by the fact that he has the symptoms of being lean, it sounds likely he will need to rejet.

Link to comment
Share on other sites
maj330 Enthusiast

maj330

Posted
Posted

You need to go up a pilot jet size or two to get out of popping (too lean) when you shut the throttle. Check the spark plug electrodes too as the PO may not have increased the main jet size to match the exhaust flow of the new pipes.

Link to comment
Share on other sites
upnorth Grand Master

upnorth

Posted
Posted

I know the V star bikes have a AIS system that adds air to the exhaust side of the combustion process that is supposed to burn any unburt fuel in the exhaust. Getting rid of that gets rid of most if not all popping/backfiring. A quick search and looks like the shadows have something similar. May be worth the effort to look into whether or not it can be modified to prevent the backfiring.

Link to comment
Share on other sites

Join the conversation

You can post now ↓↓↓ or ask your question and then register. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing


  • Your Responses - Share & Have Fun :)

    • smurfy
      Random Daily Pics

      By smurfy · Posted

      Truly sorry to hear that duffman! I know that feeling.  Keep the good memories  
    • Duffman
      Random Daily Pics

      By Duffman · Posted

      Chamois passed away this weekend a couple days short of her 13th bday. What a great dog to hang out with here at home and on distant adventures. Gonna miss ya big time my little big girl.
    • Crow Hunter
      New boat question

      By Crow Hunter · Posted

      Sounds pretty sweet, alright. I will check them out, thanks.
    • Wanderer
      New boat question

      By Wanderer · Posted

      If you really want to treat your wife (and yourself) with a remote operated trolling motor, the Minn Kota Ulterra is about easy as it gets.  Auto stow and deploy is pretty awesome.  You just have to turn the motor on when you go out and that the last time you have to touch it.   24V 80lb.  60 inch shaft is probably the right length for your boat.  They ain’t cheap - about $3k - but neither one of you would have to leave your seat to use it all day.
    • Crow Hunter
      New boat question

      By Crow Hunter · Posted

      Wanderer, thanks for your reply. I do intend for it to be 24 volt, with a thrust of 70-80. Spot lock is a must (my wife is looking forward to not being the anchor person any more).  With my old boat we did quite a lot of pulling shad raps and hot n tots, using the trolling motor. Unlikely that we will fish in whitecaps, did plenty of that when I was younger. I also need a wireless remote, not going back to a foot pedal. We do a fair amount of bobber fishing. I don't think I will bother with a depth finder on the trolling motor. I am leaning toward moving my Garmin depth finder from my old boat to the new one, just because I am so used to it and it works well for me. I am 70 years old and kinda set in my ways...
    • Wanderer
      New boat question

      By Wanderer · Posted

      Dang, new content and now answers.   First, congrats on the new boat!   My recommendation is to get the most thrust you can in 24V, assuming a boat that size isn’t running 36V.  80 might be tops?  I’m partial to MinnKota.     How do you plan to use the trolling motor is an important question too.     All weather or just nice weather?   Casting a lot or bait dragging?   Bobber or panfish fishing?   Spot lock?  Networked with depth finders?  What brand of depth finders?
    • smurfy
      Time for a smoke

      By smurfy · Posted

      Nords!
    • smurfy
      Time for a smoke

      By smurfy · Posted

    • Crow Hunter
      New boat question

      By Crow Hunter · Posted

      We have bought a new boat, which we will be picking up this spring. It is an Alumacraft Competitor 165 sport with a 90 horse Yamaha motor. I will be buying and installing a trolling motor,  wondering if I can get some recommendations on what pound thrust I will want for this boat?  Also, I will be selling my old boat, is there a good way to determine the value on an older boat ( mid-80's with a 75 horse 2-stroke  Mariner motor)  I will appreciate any help with these questions.
    • smurfy
      What's on the grill

      By smurfy · Posted

  • Topics

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use and Privacy Policy. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.

  I accept