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Message started by SeeAPierce on 01/16/06 at 09:42:32

Title: Stuck Idle Mixture Screw
Post by SeeAPierce on 01/16/06 at 09:42:32

It seems I need to remove and replace mySTUCKIdle Mixture Screw:

http://suzukisavage.com/cgi-bin/YaBB.pl?board=RubberSideDown;action=display;num=1137308181

I have searched the forum but can't find that anyone has posted any tips...Any tips out there, or is it going to be the standard drill and extract?

Title: Re: Stuck Idle Mixture Screw
Post by Steve530 on 01/16/06 at 09:51:48

That's a tough one. Since it's in a recess and does not protrude toward the inside, I can't imagine how you could grab it. I doubt an ez out would work either.

So that leaves you with using the slot to back it out. Maybe you need more torque. Like a screwdriver with a larger diameter handle. I'd be afraid to use an impact driver on something like that. A slotted screwdrive socket on a handle might work, but if you strip it, you really don't have a chance of getting it out.

I think I'd take it back to the dealer that did that and ask them to fix it. Or leve it alone if it seems good.

Steve

Title: Re: Stuck Idle Mixture Screw
Post by Savage_Rob on 01/16/06 at 10:14:24

SeeAPierce wrote:

When I was first doing the carb mods, I was not able to get mine out much before it stuck and the slot stripped. I wound up taking Lancer's advice and trying a pilot jet one size larger than the original. It worked perfectly for me. It's certainly easy enough that it's worth trying.

Title: Re: Stuck Idle Mixture Screw
Post by SAMM on 01/16/06 at 11:23:55

My mixture screw turned nicely untill I made the mistake of trying to see how many turns it was out from bottom.. Ones I bottomed it out ( just softly bottomed) It was so hard to back it back out !! I even striped the slot off the screw !! Had to use a hack saw blade to cut a slot through the case and onto the screw head...Finaly got it back out again to where it runs the best but still feels extreamly bound up !!! I should have left it alone when I had it running great in the first place !! ??? Im afraid to try to remove it for replacement...I think I will leave it alone.......

Title: Re: Stuck Idle Mixture Screw
Post by Steve530 on 01/16/06 at 11:55:32

Rob,

Is that pilot jet really small and way up in a cavity?

I followed the Clymer manual for carb disassembly and dipped the carb to remove shellac this weekend. Later I realized that I did not remove the pilot jet. I'm think I may replace the pilot with a 55 jet.

Looks like I might be able to do this without removing the carb. Is that possible?

Steve

Title: Re: Stuck Idle Mixture Screw
Post by Savage_Rob on 01/16/06 at 12:31:23

Steve530 wrote:

Yes on both counts. The pilot jet is smaller and is recessed quite a bit but I had no problem accessing it the same way you do the main jet... just drop the float bowl off the bottom. Mine was seized up inside it though and I used an EZ-Out to back it out. That worked perfectly though the jet was fully boogered up once it was removed. I just put the new one in and it ran fine.

Title: Re: Stuck Idle Mixture Screw
Post by Steve530 on 01/16/06 at 12:44:52

Thanks, Rob.

Title: Re: Stuck Idle Mixture Screw
Post by Savage_Rob on 01/16/06 at 12:53:24

You bet. Greg's pictures in the Carb Specs. (http://suzukisavage.com/cgi-bin/YaBB.pl?board=tech;action=display;num=1098869040) thread in the Tech forum really show everything well. Take a peek at 'em.

Title: Re: Stuck Idle Mixture Screw
Post by Steve530 on 01/16/06 at 15:12:19

What suprised me was the size of the jets. I didn't get much of a sense of scale from the pics. The diameter of the main jet is about the size of a pencil eraser.

Steve

Title: Re: Stuck Idle Mixture Screw
Post by iKrayg on 01/19/06 at 20:20:20

Hey SAMM,
How many turns out was it before it got stuck? I know it's different bike to bike; kind of just taking a pole.
Thanks,
Craig

SAMM wrote:

Title: Re: Stuck Idle Mixture Screw
Post by SAMM on 01/19/06 at 20:23:55

Sorry Im not sure...I was just trying to back it out till it ran smoothly.. then I thought I would leave it alone... It sure is stiff to turn now !!!

Title: Re: Stuck Idle Mixture Screw
Post by Steve530 on 01/19/06 at 20:42:05

I got about 3 turns before mine got really hard to turn.

Title: Re: Stuck Idle Mixture Screw
Post by Dynobob on 01/19/06 at 21:53:58

Steve530 wrote:

Looks like I might be able to do this without removing the carb. Is that possible?

No problem. Just loosen up the carb clamps and rotate the carb. I did my entire rejet with the carb on the bike.

Title: Re: Stuck Idle Mixture Screw
Post by slavy on 01/20/06 at 07:27:11

You can try something , that has worked for me.
Pull the carb off, drain the gas and let it sit a little so there is nothing to spill. Take a propane torch / a little pencil torch is better, because You can not overdo it/ and heat up the carb. body, where the pilot screw is threaded. You might have a little burning gas, but don't worry- nothing dangerous. Have WD40 on hand. When You get everythind pretty hot, You spray a little WD40 around the screw and try JENTLY to move the screw left, and right, and left........,When it starts to move, every time You go a little bit more to the left. Once You have the screw out, make sure You cut and shape the slot , so this doesn't happen again.

Title: Re: Stuck Idle Mixture Screw
Post by SeeAPierce on 01/20/06 at 11:23:43

Thanks Slavy! I was wondering if there was a safe way to use heat to help me out on this problem. A little wary with fire + gasoline, ya know? But since the screw and the carb body are dissimilar metals, they should expand and contract at different rates, helping one seperate from the other.

If I get brave I'll give this a try. Otherwise I'm going to up my pilot jet to a 55 and call it a day...

slavy wrote:

Title: Re: Stuck Idle Mixture Screw
Post by Dynobob on 01/20/06 at 12:17:52

slavy wrote:

Have WD40 on hand. When You get everythind pretty hot, You spray a little WD40 around the screw and try JENTLY to move the screw left, and right, and left....

Even better than WD40 is PB Blaster from the auto parts. Heat from a propane torch might help. Make sure there's no gaskets or seals in the vicinity. Remember that gasoline is highly volitile / flammable.

Title: Re: Stuck Idle Mixture Screw
Post by BS37066 on 01/20/06 at 13:52:14

Call a machine shop.

Title: Re: Stuck Idle Mixture Screw
Post by SeeAPierce on 01/20/06 at 16:33:12

My experience with machine shops and carbs is they generally say "buy a new carb". There are two "Carb specific" shops I know of, but I think they might be pretty pricey. And the bike is really running well so I don't know that I'm up for the $$. I just hate having anything "stuck".

BS37066 wrote:

Call a machine shop.

Title: Re: Stuck Idle Mixture Screw
Post by Steve530 on 01/22/06 at 08:17:51

slavy wrote:

That's a good idea, Slavy. Have you actually done this?

Steve

Title: Re: Stuck Idle Mixture Screw
Post by slavy on 01/22/06 at 10:11:34

I worked like a mechanic in a mc dealership and I have done it many times with seized pilot screws and pilot jets. In many years only once aI could not extract a pilot jet, but it was a 70's bike and everything was pretty badly messed up. I ended up cleaning the jet without removing it .

Title: Re: Stuck Idle Mixture Screw
Post by Steve530 on 01/22/06 at 11:03:52

Thanks for the reply. I appreciate the suggestion based on your experience.

I may try this if all else fails. Seems there would be a good chance for ireversible damage, though.

Steve

Title: Re: Stuck Idle Mixture Screw
Post by slavy on 01/23/06 at 15:48:24

There is no irrevercible dammage here. I did not suggest to blow a hole in the carb. This is metal, so it will heat-up a lot begfore you can hurt something. The mass of the place, where is the pilot screw is a lot smaller than the mass of the main carb body, so the carb will stay a lot cooler than the heated place. It is very hard to mess up. Just don't use a cutting torch.