1998 YZ400F Pilot jet series question.

Series 21 or 22?

Pretty sure it uses a 22.

Both are 28mm long, with a larger and a smaller diameter. The 21 has the threads on the larger diameter, and the 22 is threaded on the smaller diameter.

ty! ordered up.

its a 21.

I used the OEM options as to avoid any confusion, but thanks for the info!

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