Kayo KT250 pipe
 

I've heard that the YZ250 expansion chamber fits the KT250. Can anyone confirm?

What's a good aftermarket carburetor for the KT250?

carb
 

Kayo kt250 carb
 

How well does the carb work for the bike

It is a $400 carburetor for an $1800 bike lol.
If you hit Amazon and check the reviews, there are both name brand and knock offs for 30 to $100.
I think what you would really be paying for in that link is the name to flash amongst snobs. 20 years ago, a user in an online guitar community I was part of bought a genuine floyd rose from Japan for a few hundred dollars. It still wouldn't return to pitch like the liscensed ones I buy for 20 lol.(which return to pitch with refinements, not $$$)