Maintenance & Technical > KX500 Original

what jetting are you guys that ride dumont using?

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bennieben:
1 have a 2004 with a procircuit pipe and no other mods. the last time i went to dumont it overheated on me after my fifth run up banshee hill. i was using 91 octane fuel, mixed 32-1 maxima oil, 168 main jet. i think the altitude at dumont is 900'....when it cooled down i rode it back to camp just fine. should i just use 112 octane next time instead or should i run the 91 0ctane and bump the main to 178 or less? what setup are you guys using at dumont with the same setup i have? what is your suggestion?

bennieben:
anybody?

DoldGuy:
BennieBen,
I would have over heated on the First trip up if I had to carry your "Big Bahooky" up that hill. I have not been out there but since nobody else has posted I will try to help. It sounds as you are about right on your jetting for normal riding conditions, but, running under a big load for an extended amount of time as you are, I would go up 1 size on your main and have a 2nd step up with me. I would also have a gallon of 110 as my last option to try. Out of curiosity why aren't you running at least 93 pump gas? Available on your coast? Hope some of this helps!

DoldGuy

blueoval:
I've never seen 93 pump gas in California.  I havn't seen it in and around the Las Vegas area, either.  Does anyone know if it's available in these parts of the USA?   

Friar-Tuck:
 Bennie,
  Like DGold Guy mentioned it surely wouldn't hurt  (no pun intended) to run a bit fat on the main.
   There are several other factors to consider when trying to keep the bike cool in that enviornment.
  The type of coolant you are running, and the condition of it.  The ambient air temp, and was the bike running warm prior to the last trip.
     When you line up is the bike idling for an extended period of time between runs?
 I realize the question of lining up and "hot lapping" might not be fair, it depends on how crowded the dunes are.
    But really, if you were able to make four or five runs up the hill with no cooling down between drags, that is quite a lot of work.
    Were any of the guys you were riding with have an over heating problem or was it just your bike?
  There may be a several things to take in to account.  Have you had the bike out after that trip?   ,

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