Mammoth Mt anyone?

6 replies to this topic
  • PK

Posted May 31, 2002 - 03:18 PM


I'm heading up to Mammoth Mt for the annual MX races and was wondering if anybody else is going or has been there. I haven't ridden my bike above 5000 feet yet so I'm lookin' for some jetting specs to try at Mammoth. Alot of the guys I have talked to said they don't change the jetting from stock, they just buy the oxygenated fuel they have up there. Any comments or suggestions???

02 YZ426

  • freestyle111

Posted May 31, 2002 - 08:35 PM


i rode dodgeridge area last weekend i was between 4500 and 5500ft. weather was clear mid80' these conditions i usually have to drop a size or 2 with my main bike ran pretty good[maybe a tad rich on the bottom]with 178mj,48pj,dvp.nj 4thclip,pilotscrew also running a p38 on carb

  • DPW

Posted June 01, 2002 - 01:25 AM


Good luck at the races PK.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • PK

Posted June 01, 2002 - 05:45 AM


Thanks for the replies. Did ya sell your 400 yet DPW? I haven't, it's gathering dust. I just can't bear to part with it at what I guess is the current market value. How's your dog doing?


  • twej

Posted June 01, 2002 - 09:37 PM


I raced at 4000 ft a couple weeks ago and made no changes to the stock jetting and ran 91 octane pump fuel. Bike ran excellently. I'm also heading to Mammoth and I'm bringing a few extra main jets just in case. But nothing more than that. I've been reading up in the archives on TT and it appears that at most, I'll drop down 1 on the main jet.
We'll see.?.
Have fun.


  • PK

Posted June 02, 2002 - 07:18 PM


I'm gonna do the same as far as dropping one size on the main. I plan on leaving the pilot jet alone, maybe tinker with the fuel screw a little. Have you been there before? Have you heard about the oxygenated fuel they sell there? I guess that's the hot ticket to make the bikes run good.


  • twej

Posted June 03, 2002 - 09:01 PM


Nope, haven't been before, first time.
As far as oxygenated fuel (here in CA isn't it all oxygenated?) I've heard rumors of running other fuels but I'm just not up on that stuff. I'll take pump fuel with me and may also buy some fuel up at Mammoth.
And yeah, I'll also mess with the fuel screw a bit too.

Related Content


Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies

First Hare scramble tips by dhend8

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies

Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews

100 hrs on 2014 yz450f, shim valves or replace them? by ttr230rider6

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  79 replies

Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.