Thanks to all that replied to my original message concerning how to make a Fox .40 run from idle to full rpm's. The address to the Fox website was particularly helpful. I used information from the web to try to make the engine perform properly; unfortunately, to no avail. Comments at the website lead me to conclude that the single-needle valve carburator also has problems. However, a re-engineered two-needle valve carburator by Fox may be in the works. I'll just be patient and wait for it to be released.

Again, thanks very much.

Louis A.