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I got an E-series WB exhaust... Now what? jetting? WR400

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I have a WR400, 2000 with the air box lid off, UNI airfilter, and a stock exhaust (lawn mower tip removed) with a turn down homemade jobby. I finally got an exhaust for the bike - I'm sick of the gonzo exhaust look.

I want to put a White Brothers E-Series S-bend muffler and works pipe WB exhaust system. Everything I have came off a '98.

I have 2 questions:

Will the pipe fit my 2000 bike?

What needs to be done to this keep the beast alive and happy - carb wise? ..with just the muffler and with the whole system?

Thank you!!!

😢

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I'm not sure if the pipe will fit, not much changed between those years.

The '98/'99 YZ jetting was running a #175 main jet and ~#45 pilot jet should work good. Needle clip in the middle.

(The jetting kits in the banner ad above would improve even more... 😢 )

Thanks,

James

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What if I only use the muffler and not the pipe? Would it still need a change in the Carb?

If someone bought one of these e-series mufflers for a 2000 WR400, let me know what the instructions said as far as tuning the carb goes.

Thanks 😢

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