Logo

how do you know if bike is running lean?

This is a discussion on how do you know if bike is running lean? within the Z1K/Z750 Maintenance forums, part of the Kawasaki Z1000, Ninja 1000, Z750 & Z-750S category; Here is one for you how do you know if bike is running lean or not without getting the dyno test done? I have cut ...

Results 1 to 12 of 12
  1. #1
    dlrblkjack
    Guest dlrblkjack's Avatar

    how do you know if bike is running lean?

    Here is one for you how do you know if bike is running lean or not without getting the dyno test done? I have cut my stock pipes 5 inches sounds good rode a few hundred miles no problems I have been reading post where they took out the baffles completely and there bike runs bad. Next step is to put a k and n filter in.

  2. # ADS

    Welcome to the largest Kawasaki Motorcycle Forum on the web.
    Registers users do not see these ads, register today - it's free!

  3. #2
    Site Elder msm500's Avatar
    Join Date
    Mar 2005
    Location
    Western Kentucky
    Age
    35
    Posts
    606
    An exhaust gas analyzer is the only true way to know. One can look at spark plug color and throttle responce and get in the ball park. The inner two plugs are a pain to get to but if the plugs look like the have alot of white ash on them then the engine is too lean. If the are charcol black then the engine is too rich. Your plugs should be sort of a chocolate milk color.
    "It's a crazy world out there, have fun with it"

    List of Mods..............
    Custom case sliders
    Motovation Frame sliders
    Long stem mirrors
    Lead shot in the handlebar
    Corbin seats
    Custom fender eliminator
    LED turn signals/marker lights
    Yoshimura RS-3
    Techlusion TFI
    K&N Airfilter

  4. #3
    West Coast Moderator
    Supporting Member
    Martin64's Avatar
    Join Date
    Oct 2001
    Location
    El Cajon, Ca.
    Age
    50
    Posts
    12,785
    Thanked
    17 times
    A quick way is to pull the spark plugs and see what color they are. You want a light tan to carmel color. White is too hot (lean) and black is too cold (rich).
    ZR-7OA #110
    This map is informational only. No representation is made or warranty given as to its content or usability. User assumes all risk of use.

  5. #4
    Rising Star Crazi's Avatar
    Join Date
    Jul 2005
    Location
    Woodbridge VA
    Age
    37
    Posts
    415
    This is hardly scientific but will get you in the ball park. If you give the bike throttle and it pulls hard up to a certain rpm and then you back off at that rpm and the bike feels like it goes faster for a split second before slowing down, then its running lean.

    The closest you will get without an oxygen sensor though is reading the plugs as has been said.
    2004 ZX10R
    SR-71 - Stolen
    2005 Z1000 - Traded

    ALWAYS ride YOUR ride...

  6. #5
    Supreme Being BCRider's Avatar
    Join Date
    Sep 2004
    Location
    Burnaby BC, Canada
    Age
    60
    Posts
    2,059
    Thanked
    1 times
    Crazi described the top end test nicely other than you want to roll off from full throttle SLOWLY to feel the surge. If it's going to happen it'll happen over the first 5 or so degrees of travel on the grip. That's only a little so be sensitive to it.

    At cruise settings and rpm's in the 3000 range if the bike sort of surges and sags in a repetitive way about once every 1/2 to 1 second that's a sign that it's lean on the idle and low opening region.
    The re-emergence of the nakeds has started and one day soon true men will be proud to show their naked engines to the world once again without shame or ridicule. Free from the persecution of the heathen element that would clothe the honesty of real metal behind the false promises of plastic.

  7. #6
    dlrblkjack
    Guest dlrblkjack's Avatar

    Question on bike running lean

    Thanks looks like it is okay. I contacted speedworks they had a good price for a pc and here is the email they sent me. Nice honest people not just trying to make a $ I had sent them a email telling them I cut my pipes down 5 inches and might remove the cat here is there response

    That being said ... what you're doing / have done to your bike really
    doesn't warrant purchasing or installing one. It won't make any
    noticeable difference in performance. You *might* be able to eek out an
    additional 2hp - 3hp installing a power commander and having someone
    spend an hour on a dyno tuning it, but that's really going to be about
    it. Same thing with installing a slip-on exhaust. You really only need
    to use a PC when installing an aftermarket full exhaust system, as there
    you're changing the exhaust flow enough to make a difference in terms of
    fuel-injection mapping.

  8. #7
    Supreme Being BCRider's Avatar
    Join Date
    Sep 2004
    Location
    Burnaby BC, Canada
    Age
    60
    Posts
    2,059
    Thanked
    1 times
    I have to call BS on this in the Z's case. I did the airbox mod and added slightly choked down Muzzy slipons and it was very noticably lean. It was fully ridable but adding the PCIII and even the generic Muzzy slipon map made a world of difference to the smoothness and mid range pickup. I only visit the redline on this bike once in a blue moon but I practically live in the 4000 to 9000 range when looking for some pizzaz. And it's there that the PC III came to the rescue in a big way.
    The re-emergence of the nakeds has started and one day soon true men will be proud to show their naked engines to the world once again without shame or ridicule. Free from the persecution of the heathen element that would clothe the honesty of real metal behind the false promises of plastic.

  9. #8
    Site Elder msm500's Avatar
    Join Date
    Mar 2005
    Location
    Western Kentucky
    Age
    35
    Posts
    606
    I agree with BC. My Yohi's are nothing more than glass packs. I mean you can see straight through them. I would call that a significant change to the exhaust flow.
    "It's a crazy world out there, have fun with it"

    List of Mods..............
    Custom case sliders
    Motovation Frame sliders
    Long stem mirrors
    Lead shot in the handlebar
    Corbin seats
    Custom fender eliminator
    LED turn signals/marker lights
    Yoshimura RS-3
    Techlusion TFI
    K&N Airfilter

  10. #9
    Rising Star Crazi's Avatar
    Join Date
    Jul 2005
    Location
    Woodbridge VA
    Age
    37
    Posts
    415
    +3 on this one... The bike's stock map is optimized for emissions and general ridability. When you start modding for power, you need a way to add or remove fuel from different areas. Even just for smoothing things out, the PC is worth the money if you ride at a moderate to fast pace. If your riding style has you doing more cruising than carving, then I would agree about not needing a PC.

    Has this shop ever seen a Z1000? Are they familiar with the stock pipes configuration and weight? Going to a 4 into 1 will remove enough weight to make the bike handle differently and the exhaust flow will be enough to require a change in mapping if you want your bike running its best.
    2004 ZX10R
    SR-71 - Stolen
    2005 Z1000 - Traded

    ALWAYS ride YOUR ride...

  11. #10
    Johnny Blue Lightnin'
    Supporting Member
    JonF's Avatar
    Join Date
    Mar 2002
    Location
    Severna Park MD
    Age
    50
    Posts
    12,030
    Thanked
    81 times
    Insert Jeff Foxworthy voice here:

    If you've got holes burned in your pistons.... You might be a little lean!

    End Jeff Foxworthy voice.
    Jon

    2010 Triumph Tiger 1050
    2005 Yamaha FJR 1300 ABS Sold
    2000 ZR-7 - Sold and still missing it
    2001 KLR 650 - Gone but not forgotten
    2001 King Quad 300
    Riderforums Moderator

  12. #11
    Up-And Comer jferazza's Avatar
    Join Date
    Sep 2004
    Posts
    81
    Exhaust gas analizer, exhaust gas teperature guage, detonation sensor. But it all depends what rpm you are looking at. Bikes will run different at different throttle settings and rpm. Lean on bottom rich on top or whatever. Run some race gas and do some plug chops at different throttle and RPM settings. Dont even waste your time trying to read plugs on pump gas it all burns black.

  13. #12
    Site Elder fast_stakes's Avatar
    Join Date
    Apr 2006
    Location
    Central Iowa
    Age
    30
    Posts
    735
    Quote Originally Posted by jferazza
    Exhaust gas analizer, exhaust gas teperature guage, detonation sensor. But it all depends what rpm you are looking at. Bikes will run different at different throttle settings and rpm. Lean on bottom rich on top or whatever. Run some race gas and do some plug chops at different throttle and RPM settings. Dont even waste your time trying to read plugs on pump gas it all burns black.
    It is true that bikes will run differently at different throttle settings and rpm's which is how the PC is programed, 5 throttle settings and 250 rpm incriments.

    Unfortunately not everyone here can afford some race gas, plus if you go too high of an octane it will actually hurt performance. You can read plugs on pump gas and you can even fine tune things a little just by looking at the plugs. The deeper you look into the plugs the higher the revs you are looking.

    Sorry just had to add my and now I will get off the

Ads

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Search tags for this page

bike running lean
,

how do i know if my bike is running lean

,
how do i know if my motorcycle is running lean
,
how to tell if a motorcycle is running lean or rich
,

how to tell if bike is running lean

,

how to tell if motorcycle is running lean

,
how to tell if my bike is running lean
,
how to tell if you bike is running lean
,

how to tell if your bike is running lean

,

how to tell if your motorcycle is running lean

Click on a term to search for related topics.