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Carb Screw Seized...

  • Thread starter Thread starter therefinery
  • Start date Start date
T

therefinery

Guest
Hi guys,

I took the plunge yesterday and decided to pull the carbs for a full strip down and rebuild on my GS650G Katana. Everything was going to plan, then I hit a bit of a road block. One of the phillips screws has seized on the end of the underside bracket that holds the carbs ganged together. I have tried heat, penetrating oil, gentle persuasion, even gently whispering, everything. I decided to stop so i didn't strip out the phillips screw or worse shear it of in the thread well.

Any suggestions would be welcomed.

Thanks in advance.

J.
 
An impact driver will work wonders. So will a pair of vice grips, tightened on the outer diameter of the screw head.
 
JJ said:
An impact driver will work wonders. So will a pair of vice grips, tightened on the outer diameter of the screw head.
Click to expand...

JJ,

I haven't tried the vice grips or the impact driver. I thought if I had used an impact driver it would just strip out the screw head. Very frustrating.

J.
 
Like JJ said use an impact driver but don't buy one from Harbor freight as their bits are too soft. Sears sells a decent one for the price. Once you do, socket cap screws are a popular replacement and work great
 
It most likely isn't phillips head but JIS. Most screws get damaged fairly quick using a tool that isn't a good fit, hence, as cowboy said, replacing with capscrews is a popular choice.
 
therefinery said:
...... One of the phillips screws has seized on the end of the underside bracket that holds the carbs ganged together.
Click to expand...

Although the screws look like the cross-head "Phillips" pattern, they are actually JIS (Japanese standard). Screwdrivers or bits according to the JIS standard have a different profile at the tip and will not "cam out" of the screw head like a normal Phillips screwdriver will.

If they are available in your country, the "Vessel" brand of JIS screwdrivers are excellent. They even have a impact driver that look just like a normal screwdriver. There have been a number of posts here recently on these tools.
 
Heat and cool with a blow torch. Get a punch (flat head) and give it a couple of sharp knocks - to break the thread lock. Cut a slot in it with a hacksaw or a dremel. Apply lots of magic solution (50% brake fluid and 50% cellulose thinners) and allow plenty of time for it to soak in.

P1050774.jpg


Then this happens:

P1050782.jpg


So cut another slot:

P1050788.jpg


And so on. See the whole thread here:

Carb Screw Problem


I think you have only just started with this one.

Good luck.
 
I had that happen on a least of handful of my carb gang screws. And I had the right screwdriver.

I used the thinnest zip cut blade in a angle grinder and just carefully ground a nice slot most of the way thru the middle of the phillips head screw to leave a nice deep slot.
Then used the largest, tightest fitting screwdriver I had, a firm grip and they just backed right out.

I think the grinding could have created a lot of heat in the screw as well and that may have helped in the whole process.

Bought new screws, flat washers at local Home Hardware bolt bin,...they look fabulous.
 
If it's only one screw that's stuck, then de-gang the carbs and simply turn the rail counter clockwise while holding the carb body. The screw will turn with it and be loose enough to remove.
 
Hi all,

thanks for for all the tips. The gang screws were infact JIS. That was my error. I jut took my time and managed to get there using vice grips. I have to say I've always been a bit wary of the idea of using an impact driver on anything that feels seized. I gave it a whirl on the flips side of the carbs, now I have a new friend. Thought I would have stripped out at least one screw. But made it unscathed.

J.
 
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