CRF450R with athena 490kit
  • hyperflow
    Posts:17
    Joined:Fri Jul 20, 2007 3:45 pm
    CRF450R with athena 490kit

    by hyperflow » Mon Aug 13, 2007 9:31 am

    I just got a crf with a 490 kit, full FMF powerbomb exhaust, Quickshot, procom revbox and twin air filter.

    Anybudy know what i should be running for jetting?
  • nedirtbikr
    Posts:1261
    Joined:Thu Jan 06, 2005 12:28 pm

    by nedirtbikr » Mon Aug 13, 2007 12:48 pm

    I have no idea on the jetting...but would really LOVE for you to post updates or send me PM's on how things go with the installation and how you like it overall after using it for a while. Good luck with that thing! :twisted:
    2006 CRF450R (For Sale)
    A-47753 (Jumpin' dirt and clouds!)
    Proud member of the Hamster Nation!
  • User avatar
    Jethro
    Posts:285
    Joined:Tue Apr 17, 2007 10:25 am

    by Jethro » Mon Aug 13, 2007 3:32 pm

    i would also like to know how that works out for you. i have been curious and waiting for the opportunity to ride a big bore kit in a 450. i almost look forward to blowing my top end so i can try it. umm knock on wood....
    "Running is not a plan, Running is what you do when the plan fails"
    Image
  • MadMatt
    Posts:64
    Joined:Mon Apr 02, 2007 8:52 am

    by MadMatt » Mon Aug 13, 2007 5:55 pm

    :twisted: I bet that hauls some serious Donkey! With those mods would'ent it have a jet kit already?

    EDIT: a** changes to rear lol, rear makes me feel old
    Last edited by MadMatt on Tue Aug 14, 2007 11:42 am, edited 1 time in total.
    _________________
    2005 crf450r
    1971 z50
    1984 odyssey fl250
  • hyperflow
    Posts:17
    Joined:Fri Jul 20, 2007 3:45 pm

    by hyperflow » Tue Aug 14, 2007 5:56 am

    well thats the problem its slow, stock bikes are beating me. Im 1 bike lenght behind a stock 07 ktm 450sx

    I was running a 170 main, called athena yesterday they told me to drop to a 160 main. We'll c if that helps i guess.
  • MadMatt
    Posts:64
    Joined:Mon Apr 02, 2007 8:52 am

    by MadMatt » Tue Aug 14, 2007 11:51 am

    Are you loosing on top end or all the way through?
    _________________
    2005 crf450r
    1971 z50
    1984 odyssey fl250
  • hyperflow
    Posts:17
    Joined:Fri Jul 20, 2007 3:45 pm

    by hyperflow » Tue Aug 14, 2007 4:29 pm

    im faster up top from the other bikes, but by the time i would catch up the races would be over. Im running a brand new starcross in the back. Traction wasn;t the problem
  • RJacks258
    Posts:36
    Joined:Sat Aug 11, 2007 6:27 pm

    by RJacks258 » Wed Aug 15, 2007 8:23 am

    One of the things probably needed is to lean out the main jet, pilot jet, and richen the air jet. With the big bore kit you now have more air being pulled through the carb so it's pulling more fuel through the existing jets than the 450cc engine would.
    Another trick with the big bore is don't let it rev out so much. Shift a bit earlier.

Who is online

Users browsing this forum: Bing [Bot] and 2 guests