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Phew!! I also have a Honda 400ex (The gray one in my profile pic) and I have the 16cc bore kit. I'm so glad that you considered this one and not the 40 kit. The 40 kit are known for overheating and ruining your bike. Hey let me know how much of a pain in the a** adjusting the timing is, cause it's a very large pain in the a** let me know if you have any tricks to help make it easier lol.
Good Luck,
Cameron
Good Luck,
Cameron