Broken mixture screw in carb body - SV650.org

Taipan · 06-02-12, 02:54 PM

Hi All
Got a spare set of low mileage carbs which I'd like to fit to my SV. Only problem is the mixture screw is stuck in there. You can see the "shoulders" of the screw are missing and its a bit scratched up where someone has tried to get it out. Any good tips on how to remove this screw?
Thanks

07-02-12, 10:59 PM

You can by screw extractors for this very problem. You drill and tap a thread that is the opposite of the screw and out it comes.
If there is anything you can get hold of on the screw. you could try applying heat to the local area and see if that frees it enough to turn. Remember "righty tighty, lefty loosey"

andrewsmith · 08-02-12, 07:33 PM

Get some plus gas on it and soak it.
Could be worth getting a left handed drill bit and seeing if that can get it out.

The screw extractor would personally the last option.

yorkie_chris · 10-02-12, 10:03 AM

Good luck, these are a complete b*stard.

Soak in plusgas, apply gentle heat, repeat a lot.

Then I would start in with a left hand drill and hope for the best. Good luck.

06-02-12, 02:54 PM	#1
Taipan Member Join Date: Mar 2007 Location: Basildon, Essex Posts: 785	Broken mixture screw in carb body Hi All Got a spare set of low mileage carbs which I'd like to fit to my SV. Only problem is the mixture screw is stuck in there. You can see the "shoulders" of the screw are missing and its a bit scratched up where someone has tried to get it out. Any good tips on how to remove this screw? Thanks

07-02-12, 10:59 PM	#2
GagginForraPint Guest Posts: n/a	Re: Broken mixture screw in carb body You can by screw extractors for this very problem. You drill and tap a thread that is the opposite of the screw and out it comes. If there is anything you can get hold of on the screw. you could try applying heat to the local area and see if that frees it enough to turn. Remember "righty tighty, lefty loosey"

08-02-12, 07:33 PM	#3
andrewsmith Member Mega Poster Join Date: Apr 2010 Location: Newcastle upon Tyne, Just south of salad dodging country Posts: 7,750	Re: Broken mixture screw in carb body Get some plus gas on it and soak it. Could be worth getting a left handed drill bit and seeing if that can get it out. The screw extractor would personally the last option. __________________ RIP Reeder 20/07/1988 - 21/03/2012. Always missed squire!!! Every year we meet old friends, gain some new ones, lose old ones and you always remember them all. “Live as if you were to die tomorrow. Learn as if you were to live forever.” Mahatma Gandhi

10-02-12, 10:03 AM	#4
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: Broken mixture screw in carb body Good luck, these are a complete b*stard. Soak in plusgas, apply gentle heat, repeat a lot. Then I would start in with a left hand drill and hope for the best. Good luck. __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

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