Hello & Welcome to our community. Is this your first visit? Register

Thanks Thanks:  0
Likes Likes:  6
Dislikes Dislikes:  0
Results 1 to 8 of 8
  1. #1
    zdrinkwine70 (OP)
    Junior Member
    Join Date
    Mar 2019
    Location
    Minnesota
    Posts
    11
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Question Loping idle after cat cut.

    Hello,

    Thank you for taking a look at this thread, take the information you may find helpful and use it, and post anything that may be helpful for the problem being expressed. I currently have a 2007 Yamaha FZ6 S2. I recently purchased a de-cat to go with my Delkavic slip ons. Currently the bike has Delkavic slip ons, K&N air filter, and a de-cat from Delkavic.
    Upon installing the de-cat I started the bike being completely cold and during warm up it ran perfectly fine. After it was 120f the bike started to lope and the RPMS would jump maybe jump at max 100 and before when warmed up it would never do that. Another thing to add is that during installation of the de-cat, I did replace the spark plugs which were at 12,000 miles. I double checked the seat and click(seating of the spark plug cap) to make sure the bike was not misfiring and I came up with no signs that the bike was misfiring.
    I’m pretty in tune with my bike as far as being able to tell when something’s wrong because it’s not sounding normal. I read other threads and saw that the lack of back pressure some how makes the bike idle differently? I do have the DB-killers in the slip-ons as of right now. Another thing to add is that the bike is still very responsive throttle wise and doesn’t jump RPM when held at a higher rev. With all the mods that affect air flow, would a power commander be an advised option to fix the loping idle? Does the lack of back pressure have a negative impact on performance? Is it something that I’m just going to have to deal with? I might be able to tell if there was a lack of power but I live in Minnesota, so the option of riding is out of the picture for at least a month.

    Thank you reading my post. Please leave a comment if you have any knowledge about this problem and if you were able to fix it .

  2. #2
    2007 FZ6 TownsendsFJR1300's Avatar
    Join Date
    Feb 2009
    Location
    Cape Coral, Florida, USA
    Posts
    11,201
    Mentioned
    48 Post(s)
    Tagged
    1 Thread(s)

    Re: Loping idle after cat cut.

    As you noted / discovered, too much air free flow (not enough back pressure) WILL cause loping at idle.

    It's smooth at start up due to the enrichment process (cold start), but once warm, the stock computer can't compensate, thus your lope..

    IMO, the easiest fix would be to replace the cat (and get some back pressure in there). Opening the air box for more flow ALSO exacerbates the issue.. Simply too much air flow for the stock ECU to adjust to..

    If not, an aftermarket fuel controller should help however I'm not familiar with the advanced tuning required (lower fuel mileage), etc.

    IMO, KISS (keep it simple stupid). One less thing to break / adjust, etc..
    Scott
    2007 Yamaha FZ6- BD43 headlight mod, PIAA bulbs, Stebal air horn, Scorpion SS pipes-(no DB killers), Speedohealer, HEL SS brake lines, Fenda Extenda, K&P SS re-usable oil filter, custom mounted BMW style electrical outlet(L.S.), Techmount GPS mount with handlebar bar risers/set backs, additional helmet lock, custom mod'ed seat(Spencers), Hyper light-rear running/brake light, custom radiator/fan protector, Techspec tank pads, Grip Puppies, Yamaha rear rack with custom aluminum flat rack.

  3. Likes Motogiro, dpaul007 liked this post
  4. #3
    zdrinkwine70 (OP)
    Junior Member
    Join Date
    Mar 2019
    Location
    Minnesota
    Posts
    11
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: Loping idle after cat cut.

    Quote Originally Posted by TownsendsFJR1300 View Post
    As you noted / discovered, too much air free flow (not enough back pressure) WILL cause loping at idle.

    It's smooth at start up due to the enrichment process (cold start), but once warm, the stock computer can't compensate, thus your lope..

    IMO, the easiest fix would be to replace the cat (and get some back pressure in there). Opening the air box for more flow ALSO exacerbates the issue.. Simply too much air flow for the stock ECU to adjust to..

    If not, an aftermarket fuel controller should help however I'm not familiar with the advanced tuning required (lower fuel mileage), etc.

    IMO, KISS (keep it simple stupid). One less thing to break / adjust, etc..

    Thank you for the information! I’m just digging around trying to confirm what I thought and see what some solutions might be. Unfortunately I cannot put the cat back on because the bottom clamp closet to the headers is broken and it’s tack welded onto the cat. I know that the power commander fuel controller allows for adjustments at low, mid, and high RPMS with an increase of fuel up to 10%. I don’t know if that would help? Or to download a map onto the power commander that has slip ons and an after market air filter worked into and then adjust from there? Yeah I understand your unfamiliarity with the lower fuel mileage and how to get rid of the lope but also hit the good fuel mileage. Thank you again for your response!

  5. Likes TownsendsFJR1300 liked this post
  6. #4
    2 Da Street, Knobs R Gone FinalImpact's Avatar
    Join Date
    Mar 2011
    Location
    USA, OR
    Posts
    10,981
    Mentioned
    134 Post(s)
    Tagged
    1 Thread(s)
    Blog Entries
    1

    Re: Loping idle after cat cut.

    You said it's an S2, yes?
    So you still have the cats in the header.

    Two ways to solve this;
    Turn all of the TB sync screws an equal amount until it idles right and then balance them if you feel the need or jumper the ECU with a wire to ground (I prefer an test lamp having an incandescent lamp), then go into diagnostic mode, CO mode and bump the C0 C1 values up equally to richen it up.

    My 08 was at 0/0 and I ran them up to 25/25. You may not need to go that far. You can the details on both of these with a little search.

    I also advanced the ignition from its stock 5.0 to 11.5 and mine has a lope for excessive ignition advance at idle but its so happy above 5k I just don't care!
    It also has a fuel controller and S1 header so breathes pretty well cat free.

    Let us know if you need more input.
    08 Raven w/a few mods...
    R6 Forks, R1 Rear Shock (revalved), 6 Ignition Advance, S1 CAT free Header, SS Mid-Pipe, 2Bro Exhaust, AIS block off plates, Bazzaz Z-Fi Fuel Controller & Z-AFM Data Logger, Air Box mod, CR10E Plugs, 48-Tooth Rear Sprocket, FZ1 Bars, Spider Grips, Adj levers, Powder Coated -Triple, Bars & Rear Sets, Solid mounted rear-sets w/knurled pegs, Dual Headlight, Tail Tidy, LED Combo Brake & Directionals, LED POD lights & Tinted PUIG Wind Screen!

  7. Likes Motogiro liked this post
  8. #5
    zdrinkwine70 (OP)
    Junior Member
    Join Date
    Mar 2019
    Location
    Minnesota
    Posts
    11
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: Loping idle after cat cut.

    Makes sense! The timing is a little over my head, but definitely a consideration. The thing I know the most is the throttle body syncing. To get the TB in sync, so I first have to get the idle stable by adjusting each one equally until I reach a stable idle, but won’t it fall into a lope again when I adjust them to be in sync?

    Another thing I’m curious about is that since it doesn’t bog down or lope at higher rpms could I just leave it? And would the bike not negatively impacted in the future? Will a loss of back pressure damage the bike is really what I’m asking.
    Last edited by zdrinkwine70; 03-12-2019 at 06:00 PM.

  9. #6
    2 Da Street, Knobs R Gone FinalImpact's Avatar
    Join Date
    Mar 2011
    Location
    USA, OR
    Posts
    10,981
    Mentioned
    134 Post(s)
    Tagged
    1 Thread(s)
    Blog Entries
    1

    Re: Loping idle after cat cut.

    The only wear item I can think of the timing chain tensioner.

    The CO adjust is easy.
    The sync thing, just saying if turn #1 a 1/2 turn turn them all a 1/2 turn. A quick fix.
    08 Raven w/a few mods...
    R6 Forks, R1 Rear Shock (revalved), 6 Ignition Advance, S1 CAT free Header, SS Mid-Pipe, 2Bro Exhaust, AIS block off plates, Bazzaz Z-Fi Fuel Controller & Z-AFM Data Logger, Air Box mod, CR10E Plugs, 48-Tooth Rear Sprocket, FZ1 Bars, Spider Grips, Adj levers, Powder Coated -Triple, Bars & Rear Sets, Solid mounted rear-sets w/knurled pegs, Dual Headlight, Tail Tidy, LED Combo Brake & Directionals, LED POD lights & Tinted PUIG Wind Screen!

  10. Likes Motogiro liked this post
  11. #7
    zdrinkwine70 (OP)
    Junior Member
    Join Date
    Mar 2019
    Location
    Minnesota
    Posts
    11
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: Loping idle after cat cut.

    Gotcha!! Thank you so much for the helpful input I’ll defiantly look in the CO and see what that does but I’m interested to see what the throttle bodies would do to it.

  12. #8
    Member TKBone's Avatar
    Join Date
    Mar 2018
    Location
    sterreich
    Posts
    48
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: Loping idle after cat cut.

    Concerning ignition Fazil found an ignition advance modified rotor on eBay:


    https://www.600riders.com/forum/fz6-...egree+ignition

    Works fine for me, higher quality fuel reccomend!

  13. Likes Motogiro liked this post
 

 

Similar Threads

  1. Off idle bog
    By Dadeadlyraccoon in forum FZ6 General Discussion
    Replies: 14
    Last Post: 05-21-2012, 12:52 PM
  2. FZ 600 has high idle
    By jnotes3746 in forum FZ6 Technical
    Replies: 2
    Last Post: 08-22-2010, 08:22 AM
  3. idle?
    By coursonap in forum Garage / Mechanical Help
    Replies: 3
    Last Post: 03-15-2009, 02:52 PM
  4. Idle
    By patrick a in forum FZ6 General Discussion
    Replies: 8
    Last Post: 08-07-2008, 05:50 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT -7. The time now is 10:39 PM.
4.2.5
Image resizer by SevenSkins
Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like v3.6.3 (Lite) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright 2007 , All content is property of 600Riders.Com All Rights Reserved. The opinions and posts on this site do not neccesarily reflect those of the site owners or operators.
Yamaha FZ6 and Yamaha rights are property of Yamaha Motor Company. 600Riders.com is not associated with Yamaha in any way. We are an enthusiast site dedicated to the Yamaha FZ6 motorcycles. Our goal is to offer a place for Yamaha FZ6 owners to discuss rides, events, mods, maintenance, purchasing, etc
vBulletin Skin By: PurevB.com