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road-marker

99 wr400 jetting

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iv got a 99 wr 400 and im looking at re jetting it. Its got a aftermarket exhaust on it im not sure of the brand but it is very free flowing. the air box lid hasn’t been removed but it has been cut abit to let more air in, the grey wire has been cut. The jets in it now are all standard and im not sure which ones to change or which sizes to go to? also im looking at getting some more horse out of her but i don’t want to spend millions on bits and pieces has anyone got any mods on there bike that gives it abit more power?

If anyone could help me that would be great thanks!

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