want to bore out 350 to 366

Discussion in 'Motor, Transmission, Electrical, Intake & Exhaust' started by hotboyz, Oct 4, 2012.

Yamaha Raptor 350 & Warrior Forum

Help Support Yamaha Raptor 350 & Warrior Forum:

  1. Oct 4, 2012 #1

    hotboyz

    hotboyz

    hotboyz

    New Member

    Joined:
    Oct 4, 2012
    Messages:
    5
    Likes Received:
    0
    Location:
    oregon
    I'm not sure what I should replace . I've put racing coil ,slip on exhaust , rebuilt carb , different front and rear sprockets, air filter . I would like to get rebuild kit for head new springs ,valves , ported and polished, and bore and hone cylinder to 85mm 366cc. What advice does anyone have or ideas with direction I should go??
     
  2. Oct 4, 2012 #2

    miami1

    miami1

    miami1

    Member

    Joined:
    Jan 17, 2008
    Messages:
    570
    Likes Received:
    0
    Location:
    springfield mo.
    First off welcome to the site! Several of us have gone that route and I think If you have the $ and your doing the head work any way I say go for it! However 85mm is the max you can bore these cylinders so when its rebuild time you'll likely need a new cylinder. You'll want to put an oil cooler on it (i would do that now) to keep it cool.
     
  3. Oct 15, 2012 #3

    hotboyz

    hotboyz

    hotboyz

    New Member

    Joined:
    Oct 4, 2012
    Messages:
    5
    Likes Received:
    0
    Location:
    oregon
    Thanks ...
     
  4. Oct 18, 2012 #4

    bikewarrior350

    bikewarrior350

    bikewarrior350

    Member

    Joined:
    Jan 11, 2010
    Messages:
    155
    Likes Received:
    0
    The 366 piston is a great upgrade. Pair that with a stage 1 hotcam or a web.390 cam and a good port job and itll make a warrior much faster. My 96 is built with these parts and its a much powerfull than a stock engine. Check out the details in my sig. There are quite a few of us on the fourm that are running similar setups to this and its a great combo. A few peices of advice though. You will definately want an oil cooler, and id recommend getting 10.5:1 compression since itll run a little cooler than the 11.5:1 so it should last longer. Also make sure you get the jetting dialed in or you will burn the rings up and have to get the cylinder resleaved and bored.
     
  5. Oct 27, 2012 #5

    2000customwarrior

    2000customwarrior

    2000customwarrior

    Member

    Joined:
    Mar 6, 2012
    Messages:
    90
    Likes Received:
    0
    Location:
    alexandria,alabama
    your gonna be paying a penny for the boring unless you know someone. My warriors bored .20 over so its pushing 370 right now, but leave some meat on the bone.
     
  6. Oct 27, 2012 #6

    beastlywarrior228

    beastlywarrior228

    beastlywarrior228

    Active Member

    Joined:
    Jun 29, 2009
    Messages:
    6,464
    Likes Received:
    0
    Location:
    Mogadore, Oh
    How .20 over is only like 352 .80 is 366
     
  7. Oct 29, 2012 #7

    lbjamm

    lbjamm

    lbjamm

    Active Member

    Joined:
    May 14, 2010
    Messages:
    3,314
    Likes Received:
    0
    Location:
    Fort Morgan,Co.
    I agree!
     
  8. May 3, 2020 #8

    gavinsmith391998

    gavinsmith391998

    gavinsmith391998

    New Member

    Joined:
    May 3, 2020
    Messages:
    1
    Likes Received:
    0
    I have a 97 warrior with the 366 big bore kit and a brand new head installed
    Fresh tune up
    Fresh carb rebuild
    The old stock exhaust flange doesn't line up to the new top end
    Any help please? What do i need to do to hook an exhaust up? Styles? Brands? Any help please!!
     
  9. May 3, 2020 #9

    bones

    bones

    bones

    Super Moderator Staff Member Moderator

    Joined:
    May 31, 2010
    Messages:
    3,485
    Likes Received:
    1
    Location:
    Ottawa On. Canada
    Got a picture so I can see what's going on .... might just not have something lined up cuz it should just ... could the flange just be up side down... like pain around the pipe
     

Draft saved Draft deleted

Share This Page

arrow_white