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Carburetor fuel screw broken and seated tip (see photos)

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Well, I messed with the fuel screw a bit the other day just to fine tune carb which made it worse. Pulled out fuel screw and discovered that o ring needed replacing. Decided to buy new R&d Flex Jet fuel screw...

FuelScrew.jpg

Needless to say, I was shocked to see tip missing from old screw and began to investigate why. I am a fairly good mechanic..worked on bikes a bit here and there over the years...looks to me like fuel screw tip is stuck in carb. I dont know how or why as I swear that I didnt over tighten fuel screw...

450Xcarb1.jpg

Two questions. Is this my fuel screw tip stuck in carb? If so..how do I get it out? I took the forbidden middle section of the carb apart and it looks like I can push it out somehow with a needle or maybe wrong??? Help ...please and thank you again Thumpertalk for being a great rescource... I have never had an unanswered or unresolved post here!

450Xcarb2.jpg

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Well, I messed with the fuel screw a bit the other day just to fine tune carb which made it worse. Pulled out fuel screw and discovered that o ring needed replacing. Decided to buy new R&d Flex Jet fuel screw...

FuelScrew.jpg

Needless to say, I was shocked to see tip missing from old screw and began to investigate why. I am a fairly good mechanic..worked on bikes a bit here and there over the years...looks to me like fuel screw tip is stuck in carb. I dont know how or why as I swear that I didnt over tighten fuel screw...

Two questions. Is this my fuel screw tip stuck in carb? If so..how do I get it out? I took the forbidden middle section of the carb apart and it looks like I can push it out somehow with a needle or maybe wrong??? Help ...please and thank you again Thumpertalk for being a great rescource... I have never had an unanswered or unresolved post here!

OH well You're screwed!

Not.

Call James Dean of JD jetting and he will tell what the procedure is. And sell you the carb body gasket you will need to keep the body from leaking once you put it back together.

And next time, don't pick your bike up off the ground by the Fuel Screw.

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:applause:Thank you. I just bought a JD jet kit for the bike earlier this year and was having issues...Called him a few times about it...He was a great help and fast call return. Never got the bike running perfect but good enough. Thinking this may have been why!!!!

Thumpertalk rocks once again...

👍

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Does anyone know how to get the tip of the fuel screw that is broken out of the carb?

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Does anyone know how to get the tip of the fuel screw that is broken out of the carb?

I did the same thing to my bike. I removed the screws and used a paper clip to push out the broken off tip after I used a index drill bit to take the point off the broken tip.

So it can be done. I reused the gasket and have not had any leak problems. That was over 2 years ago.

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Received an email from James Dean on how to fix this problem. Used a push pin, heat and WD 40 to getr piece out. Here is the email...

Going riding today....gotta go..see ya !!!

Dan,

Try --carefully-- punching the screw tip back down, but do not use anything with a diameter greater than 0.86mm. The diameter of the fuel screw tip was probably near 0.90mm, and stuck into the aluminum, and then broke off. I would not try drilling, unless there is no other option, and a drill near 0.80mm would be needed.

This type of breakage is a common problem with aluminum anodized fuel screws. The anodizing is difficult to control in dimensional tolerances, and the aluminum screw tip will more easily break off when the anodizing scores with the aluminum carb body. The dimensions of the fuel screw tip are critical for having a good idle and idle mixture control. We have our JDJetting fuel screws precision machined with a brass tip, and are careful to match the factory fuel screw tolerances.

See-

http://www.pbase.com/jdjetting1/image/93927626

http://www.pbase.com/jdjetting1/image/75676632

http://www.pbase.com/jdjetting1/image/130796846

and

http://www.jdjetting.com/xcart/product.php?productid=132&cat=1&page=1

Another upgrade is the dual spray nozzle, which includes the same gaskets, while you have it apart. You are already 90% of the way to installing a dual spray nozzle, the next best thing to EFI along with the jet kit-

http://www.jdjetting.com/xcart/product.php?productid=142&cat=5&page=1

http://www.pbase.com/jdjetting1/image/130364901

http://www.pbase.com/jdjetting1/image/130366629

Feel free to share the information.

I hope this helps.

Thanks,

James

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Did you get the tip out yet? If not try pushing some wire down from the hole just in front of the slide plate facing the head, this should get it out!

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Did you get the tip out yet? If not try pushing some wire down from the hole just in front of the slide plate facing the head, this should get it out!

You can't get there that way. You need to split the carb body to get to the back side of the broken seat.

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