2. CRF's Only Forums
  3. Bike Mechanics
  4. Jetting
  5. JD High alt. and race fuel.
Post Reply
Topic tools
24 posts
JD High alt. and race fuel.
  • khabibulin
    Posts:41
    Joined:Fri May 19, 2006 2:24 pm
    JD High alt. and race fuel.

    by khabibulin » Wed Mar 05, 2008 7:32 pm

    Hey guys my jd kit comes tomorrow and I cant wait. Well Im gonna be running 110 leaded. And I was wondering should I go with JD instructions or will it have to be played around with. And if so what will have to be changed? Emailed James but never heared back so I just decided to ask here. Thanks
  • heinracing
    Posts:126
    Joined:Fri Jul 06, 2007 4:49 pm

    by heinracing » Wed Mar 05, 2008 9:33 pm

    whats your elevation? if your not running a high compression piston and running race fuel your wasting your money the motor was designed to burn at a certain rate you dont gain any performce with 110 it just burns slower to prevent detonation so actually you would lose performance sense the fuel takes to long to ignite on your stock setup
  • Asmith
    Posts:14381
    Joined:Mon Apr 10, 2006 7:52 am

    by Asmith » Wed Mar 05, 2008 9:46 pm

    heinracing wrote:whats your elevation? if your not running a high compression piston and running race fuel your wasting your money the motor was designed to burn at a certain rate you dont gain any performce with 110 it just burns slower to prevent detonation so actually you would lose performance sense the fuel takes to long to ignite on your stock setup


    Don't bother with the explanation. We've all tried to teach him. He doesn't want to learn. Somebody on TT told him that 110 is the best and he won't listen to the facts.
  • User avatar
    crfsonly
    Owner
    Posts:9651
    Joined:Thu Apr 01, 2004 3:45 pm

    by crfsonly » Wed Mar 05, 2008 10:25 pm

    on the race fuel they are correct. unless it is oxygenated race fuel just having a higher octane won't increase performance. now if you have a high compression piston than higher octane will help prevent early detonation which is essential for not imploding your motor. if it's a stock motor premium pump gas works just fine.

    ken
  • Asmith
    Posts:14381
    Joined:Mon Apr 10, 2006 7:52 am

    by Asmith » Thu Mar 06, 2008 6:13 am

    crfsonly wrote:on the race fuel they are correct. unless it is oxygenated race fuel just having a higher octane won't increase performance. now if you have a high compression piston than higher octane will help prevent early detonation which is essential for not imploding your motor. if it's a stock motor premium pump gas works just fine.

    ken


    Agreed.

    Since the 110 he is using is for a new bike, stock engine, just go with what the chart included with the JD kit tells you to do.

    The oxygenated race fuels require jetting that is richer than normal due to the oxygen content in the fuel itself.
  • khabibulin
    Posts:41
    Joined:Fri May 19, 2006 2:24 pm

    by khabibulin » Thu Mar 06, 2008 12:44 pm

    The reason I use it is because it costs me 3.00. I ran it in my 450 and liked it. I may switch between the 2 to see if i notice a diffrence. You guys seemed hooked on the premium. So i will try it.
  • User avatar
    crfsonly
    Owner
    Posts:9651
    Joined:Thu Apr 01, 2004 3:45 pm

    by crfsonly » Thu Mar 06, 2008 12:58 pm

    i may use it for $3/gal! normally race fuel is 2+ times more expensive than pump gas. if you can get it at the same price as pump gas then i would likely use it in my R. my X i would always set it up for pump gas as it's easier to get.

    ken
  • User avatar
    woodsman
    Posts:2065
    Joined:Mon Oct 30, 2006 9:00 pm

    by woodsman » Thu Mar 06, 2008 4:33 pm

    What is the price of gas down there?! Up here, premium is $3.89 a gallon. (p.s. thats 92 octane).
    Currently, 05 450X
    Previously, KTM 790 Adv R, Cbr600rr, Crf450R, Crf250X
  • User avatar
    mikey526
    Posts:1176
    Joined:Sun Apr 01, 2007 5:29 pm

    by mikey526 » Thu Mar 06, 2008 5:58 pm

    woodsman wrote:What is the price of gas down there?! Up here, premium is $3.89 a gallon. (p.s. thats 92 octane).


    Sucks, dude. Gas over here is $3.20 for premium and its 93 octane. Ahh, the ups of living in Wisconsin are finally showing... :lol:
    Image
  • heinracing
    Posts:126
    Joined:Fri Jul 06, 2007 4:49 pm

    by heinracing » Thu Mar 06, 2008 7:39 pm

    you know i can go get some 85octane and put in in a barrel get a marker and say 110 makes you go faster for $4 wanna take it? where are you getting 110 for $3 i would not trust that has not been lower then $4 a gallon for over 4 years i race cars also
  • khabibulin
    Posts:41
    Joined:Fri May 19, 2006 2:24 pm

    by khabibulin » Thu Mar 06, 2008 7:39 pm

    I went ahead and got everything installed. But damn a 185 main? At 5000ft isnt that high?
  • Asmith
    Posts:14381
    Joined:Mon Apr 10, 2006 7:52 am

    by Asmith » Thu Mar 06, 2008 7:42 pm

    khabibulin wrote:I went ahead and got everything installed. But damn a 185 main? At 5000ft isnt that high?


    Way too high, you did something wrong or have a kit for an R.
  • khabibulin
    Posts:41
    Joined:Fri May 19, 2006 2:24 pm

    by khabibulin » Thu Mar 06, 2008 8:18 pm

    I have a 450R. Not a x.
  • Asmith
    Posts:14381
    Joined:Mon Apr 10, 2006 7:52 am

    by Asmith » Thu Mar 06, 2008 8:22 pm

    khabibulin wrote:I have a 450R. Not a x.


    Then that's correct. Sea level would call for a 190 main jet.
  • khabibulin
    Posts:41
    Joined:Fri May 19, 2006 2:24 pm

    by khabibulin » Thu Mar 06, 2008 8:39 pm

    Ok cool thanks alot. Oh yeah I had one more question. When adjusting the fuel screw is it clockwise leans it? or the other way.
Post Reply
Topic tools
24 posts

Who is online

Users browsing this forum: No registered users and 3 guests

  2. CRF's Only Forums
  3. Bike Mechanics
  4. Jetting
  5. JD High alt. and race fuel.
Jump to