SuzukiSavage.com - Air Fuel Mixture Screw-ed

YaBB Newbies

Offline

SuzukiSavage.com
Rocks!

Posts: 29

Air Fuel Mixture Screw-ed
03/24/22 at 14:37:45

After purchasing a small slide hammer to drill and remove the brass plug covering the screw on my 2011 S40, I find that the screw was cranked all the way IN, the slot was already worn and it would only move 2 turns before it gave up completely. Now the head slot is completely worn and I would prefer to get the screw OUT somehow instead of buying a used carb. Any tips? What size is the screw? I think it's an M5. Any help would be greatly appreciated! THANKS

Back to top

IP Logged

TheSneeze Serious Thumper Offline Posts: 1226 Northern Nevada Gender:	Re: Air Fuel Mixture Screw-ed Reply #1 - 03/24/22 at 15:11:27 A very small drill, and a matching easy-out. Delicate and difficult work, I'm afraid.
Back to top	Every twenty minute job is a stripped thread away from being a three day ordeal. '87 LS650h Savage Street Tracker (destroyed by fire) '86 LS650g Savage (parts bike) '81 Kawasaki KZ750e ELR tribut IP Logged

Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18117 Camp Springs, Kentucky Gender:	Re: Air Fuel Mixture Screw-ed Reply #2 - 03/26/22 at 03:32:03 I am not home and cannot type a detailed response using my phone- I will provide some better help when I get home tonight.
Back to top	Someday I will be old......But not today! IP Logged

justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Air Fuel Mixture Screw-ed Reply #3 - 03/26/22 at 12:19:29 I'm predicting another Gold Star response.
Back to top	The people never give up their liberties but under some delusion.- Edmund Burke. IP Logged

Dave

YaBB Moderator
ModSquad

Offline

SuzukiSavage.com
Rocks!

Posts: 18117
Camp Springs, Kentucky
Gender: male

Re: Air Fuel Mixture Screw-ed
Reply #4 - 03/26/22 at 18:22:46

Here is the link to the Technical Section where a "TORX" bit can be used to remove the stripped screw.
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1350749896/0

The threads in the carb body corrode and expand a bit - and after many years of corrosion it becomes hard to get the brass screw past the corroded threads without stripping the soft brass slot. Using a penetrating lube helps the thread issue - but also hinders the ability to keep the screw driver firmly in the slot. Once you get the old stripped screw out - it is entirely possible to strip a brand new one while putting it in past the corroded threads (spoken from first hand experience). I now own a tap to clean up the thread before I install a new screw.

I have pretty good luck getting the center of the screw drilled....I first start with a small pointy Dremel cutter to get a center point for the drill to start properly....then use the drill size as detailed in the link provided.

I am tempted to machine a plug that can go into the carb body where the brass plug was that blocked access - and have a center hole to act as a guide to center the drill....and maybe even a stop so you don't drill too deep.

Back to top

Someday I will be old......But not today!

IP Logged

MiamiBobbed

YaBB Newbies

Offline

SuzukiSavage.com
Rocks!

Posts: 29

Re: Air Fuel Mixture Screw-ed
Reply #5 - 03/30/22 at 14:29:55

Thanks for the tips!

Ultimately, I very carefully drilled the mixture screw "out" starting with a small to larger bit and staying just under size of the screw. I was actually able to unscrew the "shell" that remained and used a small dental pick to remove the peices of the needle tip, spring and o-ring. Not wanting to test the integrity of the hole threads on the new mixture screw, I went ahead and bought the M6X0.5 tap on Amazon and ran the threads with it. The new mixture screw went in like butter....for now.

As a side note, this bike had been sitting for a few years and every outer and inner screw on this carb was corroded/rusty/stripped/ruined. The entire process to get it rebuilt was a fight and this forum helped me every step of the way...I really appreciate the posts you guys have created for newbies like me!

Back to top

IP Logged

justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Air Fuel Mixture Screw-ed Reply #6 - 03/30/22 at 15:16:29 Your skills saved your butt! Good goin,, And dropping a few bucks to get the threads right and not risk a problem was smaaart.
Back to top	The people never give up their liberties but under some delusion.- Edmund Burke. IP Logged

LANCER Serious Thumper Alliance Member Offline Savage Beast Performance Parts Posts: 10670 Oklahoma Gender:	Re: Air Fuel Mixture Screw-ed Reply #7 - 03/30/22 at 17:25:13 A stainless steel set of Allen head screws are available for $15; 4 for the top, 4 for the bowl cover, and 3 for the little side cover of the stock CV carb. Holler if you want one.
Back to top	IP Logged

MiamiBobbed YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 29	Re: Air Fuel Mixture Screw-ed Reply #8 - 03/30/22 at 17:32:21 Thanks Lancer. I went to ACE and bought stainless allen head screws based on this pic from verslagen1: http://suzukisavage.com/yabb2.2/Attachments/Carb_Screws_Web_001.jpg They cost more than $15!!
Back to top	IP Logged

LANCER Serious Thumper Alliance Member Offline Savage Beast Performance Parts Posts: 10670 Oklahoma Gender:	Re: Air Fuel Mixture Screw-ed Reply #9 - 03/31/22 at 03:42:58 I get screws from a local Fastenal store in packs of 100, it’s a better price/screw.
Back to top	IP Logged