It certainly seems that way. I had one of those exact carburetors I bought new. Couldn't get it to idle. It ended up having an internal vacuum leak. I sent it back. Summit refunded my money. A few months later, I "cautiously" got another one, because my truck needed a carburetor and I liked the idea of those. I ran it for about a year and then got what I really wanted on it, a Street demon 750. I still have the Brawler 650. It ran really good, but it just was not enough. I have a pretty warm 400 Ford engine in a 75 F250. That's a HEAVY truck and it needs some carburetor. Now my 650 sits in my cabinet waiting on "whatever" I might put it on next.