What kind of carb?

[timewass]

What kind of carb does a stock 400 EX have on it?

I see from the Honda spec. sheet that it is 35.5mm piston-valve with accelerator pump, but it doesn't say what kind.

Where is a good place onling to buy jets for this carb?

It's a keihn carb and I'd get the stock jets from a dealer or service honda will probably have the best prices online.