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Some ideas on jetting for a 99 wr400

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Hi

my wr is all stock except for the baffle is out, I live in western PA. I'm just looking for soom info on jetting to max out the power and performance on my bike.. has a dead spot on the crack of the throtle.. and builds rpms slow...

all post will be helpful

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I have a '99 with the stock exhaust with baffle removed, airbox lid removed, and YZ timing. I use a 178 main and a 48 pilot, stock needle, stock clip position and it runs terrific. I never have any starting problems, either. I ride in middle TN and north AL, I think the elevation is 500-1000 ft. Hope this helps.

Roger Little

'99 WR400

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Your jetting is all going to depend on time of year(hot, humid, cold, dry variables), altitude, what mods you have made. Your hestation may be caused by a dirty accelerator pump, clean it and see what happens. Also count how many turns out you fuel mixture screw is and write it down, then try 1/4 turns out and see if it clears up the hesitation. I am currently running two turns out on the fuel screw and have all but eliminated the hesitation, of course this is just one variable, and each bike may be a little bit different.

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