preignition spark knock
Close
    
    
Results 1 to 8 of 8
Like Tree14Likes
  • 5 Post By Tweaker
  • 1 Post By Fred
  • 1 Post By Purple
  • 2 Post By JerseyJeeper
  • 2 Post By elime
  • 2 Post By Ken
  • 1 Post By plumbstraight

Thread: preignition spark knock

  1. #1
    Senior Member plumbstraight's Avatar
    Join Date
    Mar 2013
    Location
    Montesano, Washington
    Posts
    2,674

    preignition spark knock

    I have noticed my 09 has an issue with spark knock. I have a 95 and sold my 03 and neither one of them had the issue like my 09. I think I need to back off the advance on the spark. Is this possible on the TW or is it set from factory? If I lug it at all, or try to take off on a hill it complains.

  2. #2
    Senior Member Tweaker's Avatar
    Join Date
    Dec 2015
    Location
    San Diego
    Posts
    1,857
    I am pretty sure it is set. Mine were doing that when I first got them but it was because of the DG pipes. Rejetting fixed it. Maybe your main jet is glogged. I pretty sure mine was a lean problem.
    BTW we are talking about flying up to see you in ALaska.
    Fred, ejfranz, grewen and 2 others like this.
    ”Everything You Know is Wrong”

    ” How Can You Be in Two Places at Once When You Are Nowhere at All?”




    Twin 2014 TW200's made side by side on the assembly line, Moose rear racks, Protaper ATV high bars, DG oval pipes, kick starters, rejetted carbs, 130 main jets, 2 -3 -.020 shims on the needles and @ 2 1/2 turns on the pilot screw, #34 pilot jets, Acerbis hand guards, Shinko 241 front tires, modified Krator foot pegs, 14-55t sprockets, Ricochet skid plates and 90 degree fuel filters.

  3. #3
    Senior Member Fred's Avatar
    Join Date
    Dec 2011
    Location
    Turtle Wrangling the Sierras
    Posts
    18,420
    Effective timing can change slightly with a loose cam chain adjuster. Perhaps pull cam gear cover and crankcase inspection port off in order to inspect timing marks and chain tensioner? With chain tight the correct witness marks should all align, if loose timing can drift up to about 1/2 a cam tooth. If chain appears at all loose pull the auto-tensioner and inspect/clean/wind up and release for a test,etc...

    This assumes the problem is indeed a pre-ignition issue and not old fuel or carberation related.
    Last edited by Fred; 03-01-2019 at 10:08 AM.
    Tweaker likes this.
    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
    Hidden Content All Things Considered I’ld Rather Be Motorcycling

  4. Remove Advertisements
    TW200Forum.com
    Advertisements
     

  5. #4
    Super Moderator Purple's Avatar
    Join Date
    Mar 2015
    Location
    Ynys Môn
    Posts
    4,481
    Not adjustable - the timing is set by the chain - so I'm with Fred on this one .....
    Tweaker likes this.
    (Warning - Forum may contain nuts) ...... Hidden Content

    TW200 - 1998 - Japanese import - 7000 miles on the clock - TW225 Special Edition 2007
    - Hidden Content

  6. #5
    Super Moderator JerseyJeeper's Avatar
    Join Date
    Mar 2011
    Location
    NJ Shore / Pine Barrens
    Posts
    3,880
    Fuel in this mixture has two jobs:

    1. Explode and turn the crank..

    2. Cool the piston crown and cylinder walls etc. [Remember evaporation cools the surface]

    So some part of the fuel that is pushed into the cylinder actually cools it a bit. When you go lean what happens is that with every progressive stroke the cylinder / piston etc gets hotter as the cooling effect of fuel is less due to a lean mixture

    Thereby you can get Hot-Spots in the cylinder / Piston and as the fuel air mixture is compressed this Hot spot can lead to a pre-ignition, and a very lean mixture can take the damage further and sometimes hole the piston

    A slight increase to richer in mix may help (adjust the screw).

    But it could be anything.. including you are in-fact loading the little motor a bit much.
    admiral and plumbstraight like this.
    Husqvarna TE300i Fuel Injected 2-Stroke 2019
    Yamaha XT225 - 1999 Serow
    Yamaha TW200Z - 2010
    Yamaha BW200 Electric Start! - 1986
    Yamaha TTR225R - 2003
    Husqvarna 701 Enduro - 2017
    Kawasaki Prairie 650 - 2002

  7. #6
    Senior Member elime's Avatar
    Join Date
    Jul 2010
    Location
    San Jose, CA
    Posts
    6,933
    Camshaft timing is controlled by the chain.

    For spark timing, the initial advance is set when made and then further advance is by the CDI.

    There is no adjustment for the initial spark timing. At higher RPMs Tom Bauer can change the timing advance curve in the CDI or you can buy an Igni Tech CDI with adjustable spark timing you can change with your laptop.
    Long live the internal combustion engine!

  8. #7
    Ken
    Ken is offline
    Senior Member Ken's Avatar
    Join Date
    Aug 2016
    Location
    Houston, Texas
    Posts
    1,844
    I would try 95 octane if enriching the carb doesn't work and your timing lines up correctly. I had a car I increased compression on, cam change etc. It loved Valero gas. Everything else would ping and it was running rich.
    elime and plumbstraight like this.

  9. #8
    Senior Member plumbstraight's Avatar
    Join Date
    Mar 2013
    Location
    Montesano, Washington
    Posts
    2,674
    When the crew arrives at Moab I will have one of you guru's check it out for me. I have never messed with the needle or screws on the carb.
    Tweaker likes this.

Sponosred Links

Posting Permissions

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

Similar Threads

  1. Tw knock off comming to town
    By vysion in forum General Discussion
    Replies: 35
    Last Post: 04-12-2016, 11:52 AM
  2. Knock / Slap on hard acceleration...
    By Skillet in forum Technical Help
    Replies: 11
    Last Post: 02-02-2015, 08:54 AM
  3. Knock knock
    By rbm in forum Technical Help
    Replies: 12
    Last Post: 07-11-2014, 04:33 AM
  4. Is it a KNOCK ?
    By williamemack in forum Technical Help
    Replies: 7
    Last Post: 06-20-2014, 07:06 PM
  5. Don't knock it until you try it
    By motorhead in forum General Discussion
    Replies: 8
    Last Post: 06-10-2011, 05:12 PM