Throttle arm coming loose from shaft

[Bradbutlernc]

I have a problem with the carb on my falcon, the carb itself is in great shape and works great, but the copper or brass shaft that holds the throttle plate keeps messing up on me. Its mushed out on the end to hold the throttle arm in place but the shaft is so old and worn the mushed end wont hold it anymore, so the throttle shaft has play in it now, which causes a tick and erratic idle sometimes. Its very annoying and i dont have a solution to it just yet. Any advice? I thought about just trying to find a new bottom end for the carb, but can i find just a shaft anywhere?

 

[Ronbo]

I'm thinking too strong a return spring ovaled out the holes? If so, you can get it re-bushed, if you can find a michine shop willing to spend the time. Maybe a boneyard replacement? Where I'm at in GA its hard to find anything older than 1990.


Ron

 

[aribert]

I think what you are describing is the joint where the throttle shaft end is peened to retain the throttle lever. I have had this same problem with several carbs and I braze or silver solder the two together. Take it to someone who has this skill - does not need too much heat since the brazing is on the end of the shaft.

 

[Bradbutlernc]

Ive found another donor carb that ill take the bottom end off of, theres quite a few problems with this one but none affect the performance. Im just tired of the erratic idle and such. Im pretty good at soldering for repairing electronics and such, and that has crossed my mind, but i dont have a torch. I usually use regular rosin or lead core solder if needed. What materials would i need to braze it?

 

[aribert]

I don't think that common solder or even silver bearing solder (very slightly higher melt temp and about 2x the strength of typical 60/40 solder) will be strong enough. To either braze or silver solder (typically used to join copper lines for A/C systems) you would need oxy-acetylene torch (for light duty home use the big box stores sell a MAPP/Oxygen kit that would be OK for small work such as brazing on this part where the heat sink is not too great).