<VV> Secondary Carb Problems

[GYoungwolf@aol.com]

I am writing in advance (and with some embarrassment for not catching it 
sooner) in case anyone (including a couple I know of) is having problems with 
secondary carbs throttle plates sealing. I have had some complaints (polite ones, 
however) about some "sucking" carbs. It took a while to figure out what was 
going wrong, but I chanced onto it yesterday when checked out a recent shipment 
of brass throttle/choke shaft screws, and compared them to some older ones. 
The supplier inadvertently (they say) shortened them by about half a thread or 
so, or changed the taper of the head slightly. (I am returning them). I tested 
several and noticed that some (but not all) throttle plates could be moved 
(forced) even with the screws tightened with Loctite. The screws are not long 
enough to "squeeze" the throttle shaft inot the plate. This can let the plate 
move off center in the bore and create a nasty air "leak." Today I changed to a 
slightly longer steel screw until I can get this sorted out. (I like it and 
might switch.) While my customers know that they can return any defective or 
suspect carb for repair at my expense, I thought others might run into these 
screws in their kits or rebuild work. You can recognize them when installed as they 
barely clear the throttle shaft and don't really have enough showing to peen 
over properly. They are okay for the choke shaft, however. Hope this well help 
save my reputation :-). Thanks for the space.
The (embarrassed) Carbmeister