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WReckless

Elevation Change Backfire

5 posts in this topic

Ijust purchased a 2000 wr 400 a few months ago,prev. owner road mostly

in the woods at higher elevation.

Iwent to a race in the desert at lower elevation this weekend and the bike was backfireing at most hard shifts under acell.

I know i need to change the jetting,however i don't know how to tell what

size is in the bike now. If I take the jet out will the counterman at the local

dealer be able to teel me what size it is? If so what direction do i need to go?

I will be riding in higher elevations later this season,but i don't want to damage the carb or engine by running the wrong jet size when i ride desert.

Some of our rides will start on desert floor and ride to the tree line

is there a size that could work for both? :banghead:

I'm sure this subject has been posted before but any help would be great

WReckless

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At higher elevations or warmer temps than the atmospheric conditions for which the bike is properly jetted, you should need to lean it out.

FYI--you mentioned "jet" and not jets--there are a few in the carb plus the needle. So, you may have the swap out more than 1 jet and/or adjust the needle clip position.

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Read through the Jetting Database at the top of the forum.

Elevation does effect jetting. Depending on how "high" you climb depends on whether or not you jetting should change.

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