she dies

"05" wr450 all free mods done #48 pilot yzneedle clip position 4 screw 2 turns out. with the motor warm "sometimes" with the first touch of the throttle she dies .Starts right back up fine but may or may not die at the first touch again. Mabe 30% of the time it will die. Whats up with that!!!! Otherwise she rips!! Also ais removed and thest of the jets are stock. Any advice would be great!!

my 99 wr does the same thing when you ease on the throttle. i just started getting on it harder and it works

I had the same problem - I ended up changing my Accelerator Pump Diaghram and got rid of the problem .

Try a richer leak jet in the bottom of the float bowl. #40 leak jet Yamaha part number 4JT-1494F-03-00 .JET (#40) is a good starting point. Next thing to adjust if that does not fix it is your pump squirt timing on the right side of the carb needs to be delayed a 1/4 turn or so. :applause:

I had the same problem - I ended up changing my Accelerator Pump Diaghram and got rid of the problem .

I think you wright, this can be the problem.

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