ORIGINAL: captinjohn
I had a Fox about like the one in the photos. A guy gave it too me, he could not get good steady runs on it. I replaced the goofy carb with a Perry Carb....boy did that engine run good then. I think some of the fox carbs was the worst I had seen. The engine was built good and had very good compression...just a bad carb! capt,n
The carbs have been great. The issue is that you had to read the manual that came with the engine. They do NOT tune like an OS and this is a good thing (they often need less expensive low or no nitro fuel than the OS to run well) now the "odd" carb may have had the butterfly barrel if so the low speed mixture control also held the high speed fuel jet. this meant that the low speed mixture needed to be set first. as any change to it would result in a lot of cross talk with the high speed needle. Now the later Mk X and Easy Adjust carbs had you set the high speed mixture first which is the convention today on most carbs.
All the best,
Konrad