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messed up mixture screw theads

  • Thread starter Thread starter jaybo1
  • Start date Start date
J

jaybo1

Guest
I cleaned my carbs and when i was going back together with them, don'task me how but i managed to screw the threads up on the mixture screw hole on one of my carbs. I have an 81 gs850g by the way. Wat i was wondering is if i can rethread the hole and if so what thread is it. I'm guessing its probably metric, right?:eek:
 
I cleaned my carbs and when i was going back together with them, don'task me how but i managed to screw the threads up on the mixture screw hole on one of my carbs. I have an 81 gs850g by the way. Wat i was wondering is if i can rethread the hole and if so what thread is it. I'm guessing its probably metric, right?:eek:
If you have a tap the right size you can try running it up and down the threads to try and repair them enough that the mixture screw will thread back in. Don't run the tap to the bottom of the bore, use the mixture screw to reach the deep threads. Use plenty of oil then spray the fuel passages out with carb cleaner.
 
I think I would try to find a stainless steel screw the same size and pitch of the mixture screw threads to chase the damaged threads with. If you don't follow the exact path of the original threads, a tap could do more damage than good. Alignment to center is critical. A SS screw won't cut a new path in aluminum as easily as a tap unless you really force it, but it is hard enough to smooth out the damage if you carefully run it in an out until you find the correct path.
 
NOT!!! It is a 4mmX.75 thread. Ray.


I have that tap... it's a non-standard size you'll most likely have to order.

M6 x .50

very fine thread - i like the idea oldvette had to chase it with another screw first. Clean the threads well with solvent then grease them up good & try to straighten out the threads. lots of air gun blasts as you go...
 
Thanks for the info and ideas guys, i think i'll do what old vet said to do first
 
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