Noticed this for the first time when I recently swapped my idle air controller jets:
All 3 screws on this carb are fully tightened down (2 of 3 shown in photo), but the heads of the screws don't seat completely flush with the accelerator nozzles.
On the other carb, all 3 screws tighten and seat appropriately - as you would expect them to.
I removed a screw from each side and compared; they are the same length / depth.
It seems like this carb has a manufacturing defect - insufficient depth of the holes that the accelerator nozzle screws thread into.
Here's the other carb for reference:
Anyone ever seen anything like this?
Thanks,
Gordo
Edited Update
I figured it out tonight. The side that fits properly has brass washers (seals) under the nozzle fitting / in the hole that the nozzle fits into - the side that doesn't is missing these brass washers. The brass washers raise the nozzles just enough to allow the bolt to pinch and seal them to the body of the carb.
I wonder how long they've been like that...
Its possible that the washers came out when I installed the 36mm chokes. I always work on the carbs on a cart with a tray that I line with white paper towels - specifically for the purpose of finding any "spare parts" as I'm re-assembling things - but things sometimes have a habit of disappearing when you are working with small parts.
As is - this carb's accelerator nozzles weren't working properly. Some fuel makes it's way through the nozzles, but some just gushes past the nozzle and up through the gap between the fitting and the screw (most likely still gets sucked down into the carb - but definitely not as a measured squirt).
Guess I will contact Mr. Parr to ensure I get the right size - correct thickness is essential to a proper seal.
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