Big Bore Kit ? cr 125 to 144

Discussion in 'Big Bikes' started by furlong, Jun 24, 2007.


  1. furlong

    furlong Rookie DRN Member

    Joined:
    Aug 18, 2006
    Messages:
    10
    Likes Received:
    0
    Trophy Points:
    0
    Since i have my bike at a mechanic i was wondering about boring out my cr 125 to a 144 ?

    I have a Few questions?:
    - will i notice a big difference?
    - how much will this cost ?
    - or am i just better of selling it and getting a 250 ?



  2. yamarider88

    yamarider88 Rookie DRN Member

    Joined:
    Jun 24, 2007
    Messages:
    153
    Likes Received:
    0
    Trophy Points:
    0
    get a 250 if you really want all the power. when i was buying my 250 the guy also had a 125 and he let us (my father and i) drive them both to see which one we liked better and we both liked the 250 a lot better. it has a ton bigger power band. try one and compare to what you have now.
  3. sixds

    sixds Rookie DRN Member

    Joined:
    Mar 25, 2007
    Messages:
    781
    Likes Received:
    0
    Trophy Points:
    0
    i think its around 600$ from Eric Gorr. i've heard its one of the best upgrades for 125's with more bottom end and more peak.
  4. Mavrick70004

    Mavrick70004 Rookie DRN Member

    Joined:
    Oct 17, 2006
    Messages:
    37
    Likes Received:
    0
    Trophy Points:
    0
    i say get a 250 just becuase after u get used to the 144 power you are going to get the 250 anyway so instead you can use that time to get better on the 250.
  5. whenfoxforks-ruled

    whenfoxforks-ruled Old MX Racer

    Joined:
    Oct 19, 2006
    Messages:
    8,140
    Likes Received:
    1
    Trophy Points:
    38
    Location:
    Merrillville,Indiana
    You can not use all the 125's potential.More motor will seem to make you faster,it is not.Get the 134 mod.If you have the money,ask Eric for a kit,then you will have 2 bikes.An efficient rider can push either bike at the same speed!Learn on the 125 before getting a 250,if you can finish top 5 out of 40,then you are ready!
  6. 2 strokes for life

    2 strokes for life Rookie DRN Member

    Joined:
    Jan 3, 2007
    Messages:
    1,860
    Likes Received:
    0
    Trophy Points:
    0
    whenfoxforks-ruled, well put. If you ride the 125 for the rest of this season then you will learn to be an aggresive rider. The next spring when you start on a 250 you will ride it to it power more so.
  7. furlong

    furlong Rookie DRN Member

    Joined:
    Aug 18, 2006
    Messages:
    10
    Likes Received:
    0
    Trophy Points:
    0
    I know I can handle a 250 i have had 2 125 2ts and rode them each for at least a year. And i ride my dads cr 500 a nice bit too .I think i will just the 250.
Similar Threads: Bore
Forum Title Date
Big Bikes Big Bore vs. Stroker Dec 9, 2010
Big Bikes 2005 RMZ450 Athena big bore kit Nov 6, 2009
Big Bikes Question about bore size on CR 125`s Aug 28, 2009
Big Bikes Does big bore need richer jets Aug 10, 2009
Big Bikes Rmz 450f big bore kit Jul 31, 2009

Share This Page