99WR400f half throttle help

I purchased a 99 WRF 400 and It has T-4 Exhaust and header on it. My brother has a 99 YZF400 who has full throttle power and I want the same.Im wondering what all this would intell to do so? Do I have to change jetting air box etc? Oh also it has an K&N air filter also.Any intel would greatley be appreciated.

Change your throttle stopper on the carb to a YZ throttle stopper. Do a search for "free mods" on this site. :)

Does anyone know the difference between the length of the wrf 400 throttle stop and the yzf400 throttle stop on 99 models

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