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big53lee

04 yz 450f with Leo Vince slip on backfires. Starts first kick and runs strong!

3 posts in this topic

what do i have to do to my carb? i need jetting for 9000-11000 ft. I ride the rocky mountains! any tips?

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My biggest tip is to read the Stickys about jetting for all the answers to your questions, or get a JD kit.

Mike

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More backfire questions? Jeez...

http://www.thumpertalk.com/forum/showthread.php?p=3710599#post3710599

http://www.thumpertalk.com/forum/showthread.php?p=3350613#post3350613

Look in the jetting sticky in this forum, find something close to yours, then correct for the altitude:

If you are 5000 feet higher, multiply the jet size by .95 and use the nearest available size as a starting point. At that altitude, it might become necessary to use a needle with a step or two larger upper diameter.

+4000=.96

+5000=.952

+6000=.944

+7000=.936

+8000=.93

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