Rough Engine at Mid-Throttle

[Jcurry]

Originally Posted by Piper J3

I’m missing something in the translation…. I see your photos and understand that the actuating plate was installed incorrectly, however… it appears that the rotating brass shaft is still in same position when the plate is installed correctly. This doesn’t explain any difference in operation of the enrichment circuit (choke).

Jim,
I don't what to tell you. Here's what I know: I flipped the arms over and I gained 100 rpms at full throttle static as well as an increase in my idle speed. I had to redo my mechanical rigging and rebalance the carbs pnuematically. As previously stated, it runs very smooth now.

[Mich48041]

The brass shaft is in the same position in both pictures. But it might not stay in that position when the engine
is running because the spring has little tension in the first picture and greater tension in the second picture.

[rvbuilder2002]

Originally Posted by Piper J3

it appears that the rotating brass shaft is still in same position when the plate is installed correctly.

It may appear to be but it is not in precisely the same position.

The plates are not symmetrical in shape so when reversed and the plate is in contact with the stop, the shaft is at a slightly different position of rotation.