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Broken Fuel Screw Stuck

  • Thread starter Thread starter bbytes
  • Start date Start date
B

bbytes

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So I got my pilot fuel screws from Z1 Enterprises the other day. Today, I decided to replace them. I was told by someone in this forum to check the broken screws to see if the tips were stuck in the carb. Well they are. The very tip of the fuel screws on two of my carbs are stuck in the tiny hole in the carb.

Here are a few images. They are a bit big, but the detail is needed for these tiny parts.

This first picture is of the screw poking into the air intake. It's hard to see, so I circled it in the second photo.
sYeVI.jpg

LbCQa.jpg


This picture is of the bottom part of the screw where it broke. It is the copper colored center of that black ring.
AmOaY.jpg


Anyone have any ideas on how I can get it out? I've read suggestions on freezing, heating, drilling, dental picks, and a million other things, but I wanted your suggestions. I really don't want to damage the carbs.
 
Looks like my screw hole is further away from the center than that person's. I cant quite get my tool in at that angle. I have some dental picks, but no matter how I angle it, or how hard I push on it, those suckers are stuck.
 
Try holding the pick in one hand and a hardwood dowel (smoothed off to make it semi flat) in the other to give you leverage to push down on the pick.
 
If the tip is sticking through far enough that you can feel it, try rolling the shank of a Phillips screwdriver across it, it usually will push it out.

.
 
I've gotten it down a little ways. It was sticking up before, but now its still stuck, but inside the hole. I found a copper tip for my soldering iron that was smaller than the fuel screw point, I pushed it into the hole, and the tip bent.

I had the idea of using some ferric chloride to melt the stuck part out of the hole. Ferric chloride is used to melt copper to make your own circuit boards. Fortunately I did some research and found that ferric chloride will melt aluminum too, so no go with that.

I am considering, as a last ditch effort, putting a tiny amount of super glue on the tip of the broken screw, and then screwing it back in. Then I would wait for it to dry, and turn it back out. I have a feeling this wont work though, so any other suggestions are much appreciated.
 
push it back now the other way, and then back out again, sounds like you have it moving at least...
 
The super glue idea is BAD. You don't want glue inside your carb passage.

Get a properly sharp awl or similar and push the tip backwards. Sharpen the tip on a bench grinder if necessary. You can try PB Blaster and heat on the parts first to see if you can get them to loosen up a little.
 
Couldn't get the screw tips out, even with all these suggestions. I put them back on the bike with the broken screws. Maybe when I have some money, I will buy carburetors off of someone else. Anyone know what other years and bikes used the VM22 carbs?
 
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