24mm carb....Who makes it?

[400ex4ever]

Hey all, this is a pciture of the carb I got for my son's 90. I was told it was a Keihen but I believe it is one of those OKO one. Can someone help me idenify it and maybe give me an idea of where to find a manual for it. Thanks.

http://www.predatorowners.com/memberphotos/predator/1127/24mm.jpg

[Pappy]

both of the khiens we have here have KHEIN molded into the carb housing so id assume you have the off brand name unit?

[400ex4ever]

I posted on another site and they say it should say OKO imprinted somewhere on it too. This one is confusing. It works really good but just want to find a manual to help fine tune...