PlanetMinis Forums

Sikk Mx 125cc Wont start

This is a discussion on Sikk Mx 125cc Wont start within the Chinese/Import Minis - General Discussion forums, part of the General Talk category; I have a Sikk Mx 125cc bought 2006. Bike wont start. There is spark,compression looks Ok. Im confused on timing setting. It has a Gpx/Jialing ...

Page 1 of 2 12 LastLast
Results 1 to 15 of 18
  1. #1
    Junior Member
    This user has no status.
     
    Pitpower1's Avatar

    Join Date
    Oct 2007
    Posts
    10

    Sikk Mx 125cc Wont start

    I have a Sikk Mx 125cc bought 2006. Bike wont start. There is spark,compression looks Ok. Im confused on timing setting. It has a Gpx/Jialing motor. I was told piston should be at TDC when T mark on flywheel is alligned with the notch on the casing,but this is not. piston is at BDC when T mark is alligned with notch. Anyone can tell me what should it be? Appreciate If someone can tell me exactly how to set the timing. I've ben working on it for a month now and still have no clue as to why it will not start.


  2. #2
    Junior Member
    This user has no status.
     
    Pitpower1's Avatar

    Join Date
    Oct 2007
    Posts
    10

    Re: Sikk Mx 125cc Wont start

    Anyone Pls???

  3. #3
    Supporting Member
    is Alive and well !!!
     
    OLDSCHOOL's Avatar
    Supporting Member

    Join Date
    Oct 2003
    Location
    Cape Cod Ma. 02660
    Posts
    8,359

    Re: Sikk Mx 125cc Wont start

    1. take off cam cover

    2. take off flywheel cover

    3. turn flywheel by hand clockwise till flywheel timing mark (T) lines up with case mark (-) 12:00 oclock



    4. while turning the flywheel notice the Cam gear timing mark (o) rotates till it is a 9:00 oclock and aligns with the Head timing mark (-)



    when the (T) mark on the Flywheel is at 12:00 oclock and the Cam gear (o) mark is at 9:00 oclock the piston should be at TDC top dead center



    did you have the motor apart..?
    2006 STIMILON Masters of Mini Stock Class Champion

    BUILDER of mighty mini motors
    making chop suey out of the competition!!!

  4. #4
    Junior Member
    This user has no status.
     
    Pitpower1's Avatar

    Join Date
    Oct 2007
    Posts
    10

    Re: Sikk Mx 125cc Wont start

    Thanks Oldschool... I did this many times. But the piston still at BDC position instead of TDC. I ended up taking the head and cylinder removed to see what is going on inside. But all seems Ok. I still dont understand why the piston is at BDc position when I ligned up the Two timing marks.

  5. #5
    Junior Member
    This user has no status.
     
    Pitpower1's Avatar

    Join Date
    Oct 2007
    Posts
    10

    Re: Sikk Mx 125cc Wont start

    Before taking it apart I removed the carb, when I kicked start it, I feel pressure on the intake port instead of suction.

  6. #6
    Supporting Member
    is Alive and well !!!
     
    OLDSCHOOL's Avatar
    Supporting Member

    Join Date
    Oct 2003
    Location
    Cape Cod Ma. 02660
    Posts
    8,359

    Re: Sikk Mx 125cc Wont start

    What your discribing is the Cam being 180 degrees off....this wouldn't happen unless it was mistakenly put back together wrong
    2006 STIMILON Masters of Mini Stock Class Champion

    BUILDER of mighty mini motors
    making chop suey out of the competition!!!

  7. #7
    Junior Member
    This user has no status.
     
    Pitpower1's Avatar

    Join Date
    Oct 2007
    Posts
    10

    Re: Sikk Mx 125cc Wont start

    Bike was never taken apart before this problem occur. I was riding it, I heard a grinding sound inside the motor and it stopped and wont start again. I have replaced cdi and coil but no help. Timing chain is ok, spark is ok, compression is ok, the only thing I see wrong is the position of the piston. It is at Bottom dead center when I align the timing marks. I looked at the crankshaft inside, It looks ok, It make me think now that this is what it is suppose to be.

  8. #8
    Supporting Member
    is Alive and well !!!
     
    OLDSCHOOL's Avatar
    Supporting Member

    Join Date
    Oct 2003
    Location
    Cape Cod Ma. 02660
    Posts
    8,359

    Re: Sikk Mx 125cc Wont start

    Im wondering if the flywheel key sheared...?



    how is the compression?
    2006 STIMILON Masters of Mini Stock Class Champion

    BUILDER of mighty mini motors
    making chop suey out of the competition!!!

  9. #9
    Junior Member
    This user has no status.
     
    Pitpower1's Avatar

    Join Date
    Oct 2007
    Posts
    10

    Re: Sikk Mx 125cc Wont start

    Compression is Ok, I looked at the flywheel Key, it looks ok, In fact, I tried to remove the flywheel last nite, It wont come out, it is like welded to the shaft. I used gear puller, it doesnt help. I think I need the special tool to remove it.

  10. #10
    Supporting Member
    is Alive and well !!!
     
    OLDSCHOOL's Avatar
    Supporting Member

    Join Date
    Oct 2003
    Location
    Cape Cod Ma. 02660
    Posts
    8,359

    Re: Sikk Mx 125cc Wont start

    Yes a flywheel puller...



    but you must pay close attension to the crankshaft and not to smoosh the threads when removing the flywheel.



    what we need to figure out is where the piston is when the Flywheel mark and the cam gear mark is at there proper places when TDC timing is observed
    2006 STIMILON Masters of Mini Stock Class Champion

    BUILDER of mighty mini motors
    making chop suey out of the competition!!!

  11. #11
    Senior Member
    This user has no status.
     
    Psychoholic's Avatar

    Join Date
    Jun 2007
    Location
    Toronto, Ontario CANADA
    Posts
    500

    Re: Sikk Mx 125cc Wont start

    Im thinking that the flywheel might have spun/ sheared the key. There is no reason why you should be @ bdc when the T is @ 12 o'clock

  12. #12
    Junior Member
    This user has no status.
     
    Pitpower1's Avatar

    Join Date
    Oct 2007
    Posts
    10

    Re: Sikk Mx 125cc Wont start

    I will buy a flywheel puller and remove the flywheel so I can see what is going on in the crankshaft/flywheel. From the diagram I saw, the crankshaft is 3 piece, the left and right crankshaft and the journal (which is actually a pin).I am thingking the Left crankshaft might be pressure pressed,if this is so, it is possible that it came loose and shifted the shaft 180 deg. The only way to tell is to remove the fwheel,the bearing and the chain gear. Big deal,It's like tearing the whole motor apart, but what the heck,all I got to loose is the motor, heh heh heh

  13. #13
    Supporting Member
    is Alive and well !!!
     
    OLDSCHOOL's Avatar
    Supporting Member

    Join Date
    Oct 2003
    Location
    Cape Cod Ma. 02660
    Posts
    8,359

    Re: Sikk Mx 125cc Wont start

    where do you live..?



    highly unlikely for the crank to come apart/spin...Key is designed to be the weak link and "shear" to prevent major damage
    2006 STIMILON Masters of Mini Stock Class Champion

    BUILDER of mighty mini motors
    making chop suey out of the competition!!!

  14. #14
    Junior Member
    This user has no status.
     
    Pitpower1's Avatar

    Join Date
    Oct 2007
    Posts
    10

    Re: Sikk Mx 125cc Wont start

    I live in Westmont,Illinois. bike is my hobby. I have a Yamaha Virago,Kawasaki Kz550 and this Sick pitbike....

  15. #15
    Supporting Member
    is Alive and well !!!
     
    OLDSCHOOL's Avatar
    Supporting Member

    Join Date
    Oct 2003
    Location
    Cape Cod Ma. 02660
    Posts
    8,359

    Re: Sikk Mx 125cc Wont start

    Quote Originally Posted by Pitpower1
    I live in Westmont,Illinois. bike is my hobby. I have a Yamaha Virago,Kawasaki Kz550 and this Sick pitbike....


    I asked your location as I have traveled to help People all over New England with there Bikes...
    2006 STIMILON Masters of Mini Stock Class Champion

    BUILDER of mighty mini motors
    making chop suey out of the competition!!!

Page 1 of 2 12 LastLast

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

125cc motor wont start
,

125cc wont start

,
chinese pit bike kick start troubleshooting
,
inside of a sikk mx 125
,
pitbike mx125cc timing
,

sikk mx 125 bike wont start

,

sikk mx 125 pit bike

,

sikk mx no spark

,

sikk mx pit bike wont start

,
sikk mx timing
,

sikk mx wont start

,

sikk toys mx 125cc kick start

Click on a term to search for related topics.