04 yz125 low end bogging
  • Dave49659
    Posts: 2
    I have a yz 125 that keeps bogging in the low end(like when i hit the gas from a slow speed). I have replaced all the bearings and seals in the engine., I also just put a hinson clutch setup in it. I have tryed Jetting it one size smaller but still nothing. Can someone please help!!!! Thanks Dave
  • MaddogR6
    Posts: 99
    Try using the clutch. Rolling the throttle on at a low speed is going to cause it to bog for a second but then it should pick up into the midrange, gotta relize that 125's low-end is almost non existent.
  • DLHamblinDLHamblin
    Posts: 5,309
    As mentioned; 125's don't have a lot of low end to start. If you are idling along and just whack the throttle they can momentarily bog due to the throttle jumping open.

    Is this bog something that just started? Is it thesame in the lower and upper gears?
    .
    Dave H
    2011 CRF-450R
    2006 YZ250 (Son now rides it)
    image
  • canadajim
    Posts: 6
    i have a yz 125 as well, same thing happened when i swapped to a larger final drive ratio(sprockets) but running an iridium plug and good gas helps alot! and utlizing the clutch as mad dog mentioned helps alot as well so when allcombined with a good set up will wind that lil bad boy right out
  • Maple Leaf MXMaple Leaf MX
    Posts: 12,823
    No kiddin, when i was driving my buddys yz 125 around, the low end power was non-existent.
    Expect to die whenever but dream to live forever

    ..the good times on the old DR board will never be back! RIP!
  • yzwoodsyzwoods
    Posts: 18,986
    Well being as the guy who posted this hasen't been on in 6 months, You may be JUUUUUUUUUUST alittle late with the respounce.:)
    -------------------

    image
    DIABETES SUX!
  • Maple Leaf MXMaple Leaf MX
    Posts: 12,823
    As we are in 50% of the threads.
    Expect to die whenever but dream to live forever

    ..the good times on the old DR board will never be back! RIP!
  • ianthedestroyer
    Posts: 9
    this helped me thank you
  • davidcullen90
    Posts: 34
    You might not be running a rich enough fuel mixture. I did this on my bike I was supposed to do a 32:1 and I did more along the lines of a 40:1 and it caused it to bog more than usual. Also, it could be your spark plug. Make sure you're revvin the bike high rpm's instead of low end all the time, it causes carbon buildup causing your bike to bog more. Also, yz125's virtually all the power is in the mid-range to top end. Again, keep the rpm's up high! I did this end it helped considerably, also it helped me stop fouling my spark plugs!
Add a Comment

Welcome, Guest!

It looks like you're new here. If you want to get involved, click one of these buttons!

Sign In Join for Free