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Jul 21st, 2025 | | | | Joined: Dec 2011 Posts: 402 Shop Shark | | Shop Shark Joined: Dec 2011 Posts: 402 | My idle set screw keeps backing out of the bracket on my 2100. I was having problems with poor running and stalling after 10-mile runs and SWEET located the problem for me on the side of the road. The root problem is likely a vibration in the engine bay, but I'll have to find that to fix it. Duct-taped the set screw to keep it from leaving me and all was fine on the return trip home. Was wondering if you guys had a simple fix for the set screw issue. Here's the carb. Set screw is in the lower right. Jim | | | | | Joined: Dec 2011 Posts: 402 Shop Shark | | Shop Shark Joined: Dec 2011 Posts: 402 | Thanks Denny,
Wasn't sure if you could use this stuff and still have it adjustable. Appreciate the input.
Jim | | | | | Joined: Nov 2002 Posts: 2,715 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,715 | Note the screw runs through two "arms" of a U-shaped bracket. There is supposed to be just enough interference to prevent the screw from moving freely.
Remove the screw, and then take a pair of vice-grips and clamp the two arms SLIGTLY together to add a touch of interference. Then reinstall the screw.
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | | | | Joined: Jan 2009 Posts: 1,644 Shop Shark | | Shop Shark Joined: Jan 2009 Posts: 1,644 | Remove the screw and screw a nut on it screw it back on set you're idle speed than use the nut to keep it tight.
Pete | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | These are all good sugestions. I was thinking of putting a spring on it like a mixture screw.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | The spring will work, but another option is to epoxy a Nylock locknut to the throttle linkage so it holds the idle speed screw at whatever place you adjust it. It's a simple, permanent fix that doesn't look out of place to the casual observer. Install the nut with the nylon locking insert away from the linkage and use something like J-B Weld to attach it to the throttle bellcrank.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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| | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | Note the screw runs through two "arms" of a U-shaped bracket. There is supposed to be just enough interference to prevent the screw from moving freely.
Remove the screw, and then take a pair of vice-grips and clamp the two arms SLIGTLY together to add a touch of interference. Then reinstall the screw.
Jon. He is called 'carbking' for a reason. If you bend the U-shaped bracket together by a distance equal to 1/2 the pitch of one thread on the screw (carbkings 'slightly' reference), you should have what you need. I did it on my 52 twenty-nine years ago. It is the subtle things like this that make this hobby so much fun.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Dec 2011 Posts: 402 Shop Shark | | Shop Shark Joined: Dec 2011 Posts: 402 | Thanks for all the great suggestions, guys.
I must admit I was flabbergasted by carbking's suggestion; It's brilliant! I ran right out and gave it a try. MUCH better now! If the rain holds off today, I'll take a long run and test it out.
Something to be said for the wealth of knowledge and experience here. I had been puzzling this twelve ways from Sunday and kept thinking of things to add to the system when the solution was to tweak what I had.
THANK YOU carbking! And thanks to all who gave the other terrific solutions. I already know a spot where I'll be using the nylock idea.
Best Wishes,
Jim
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