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Thread: 2001 Honda CR125 jetting?

  1. #1
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    28th May 2009 - 20:00
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    2001 Honda CR125 jetting?

    Hi All - My CR125 seems to be especially boggy down low. it runs fine in the powerband, but there seems to be quite a "dead spot" between when i twist the throttle and when i get some power

    any tips?

    im thinking it needs to be re-jetted but i dont want to spend a weekend mucking round to figure out what is best (nor do i have the experience to figure it probably!)

    any help would be much appreciated.

    Cheers, Morgan

  2. #2
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    22nd April 2009 - 19:57
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    we had a 95 CR125, someone had messed with the jetting big time and was running off, i just found from honda the base settings and jet sizes, put it all back and it was pretty good, i ended up 1/4 turn richer to allow for the procircuit pipe and dropped the needle 1 slot for trail riding. i hope the attachment comes out as it is a great 2 stroke jet Gide.
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  3. #3
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    7th September 2008 - 18:48
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    you may also want to check your reeds if you haven't already done so

  4. #4
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    2nd October 2005 - 00:47
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    My guess is that your airscrew needs a tweak. What is it set to now?

  5. #5
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    If the bike has always been like this, then it might have a too larger main jet in the carburettor, try going down a size, or find out what the factoury setting are from your local honda dealer.

  6. #6
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    I took the bike out for a quick ride this evening, and had a play with the air screw - it was about 2 - 3 turns out. I rode it round at 1.5 turns while i warmed up the bike and it was definately sluggish, then i played with it while it was idling - got to about 5 screws before i found some decent throttle response - i guess i need to go down a size in the needle then?

  7. #7
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    22nd April 2009 - 19:57
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    Quote Originally Posted by morg_nz View Post
    I took the bike out for a quick ride this evening, and had a play with the air screw - it was about 2 - 3 turns out. I rode it round at 1.5 turns while i warmed up the bike and it was definately sluggish, then i played with it while it was idling - got to about 5 screws before i found some decent throttle response - i guess i need to go down a size in the needle then?
    i think you mean lift the needle or a bigger jet. i would find the base factory settings and work from there, it will save a whole heap of time, if it is the air screw you have wound out 5 times it really means you cant get enough air in for the gas, maybe a smaller jet or drop the needle, set back to 1 1/2 turns out ant play from there.
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  8. #8
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    17th August 2005 - 11:00
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    No no no!! Lifting the needle or bigger jets will make it worse if the Idle/pilot jet is already to rich. The air screw having to go 5 turns out means the pilot jet/circuit is to rich! Not the needle, although changing the pilot may mean a needle clip change later on???
    Just watch out when leaning a pilot jet as it is the one jet that delivers fuel right through the throttle range and leaning this jet may have some effect on your mid and possibly main?

    I usually steer away from trying to jet a bikes over the internet unless someone is going to make a cock up and leaning your needle and/or main to compensate for a rich Idle jet is a bit dangerous.

    Read this attached! And tune it in the order its written. I also agree completely with finding out whats factory and start from there!!
    Attached Thumbnails Attached Thumbnails Tuning 2smokers..pdf  
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