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Message started by Josh C on 08/11/08 at 10:37:02

Title: air/fuel mixture screw approach
Post by Josh C on 08/11/08 at 10:37:02

Broke off the tip of a screw in the little hole in the brass plug covering up the air/fuel mixture screw in my first little attempt to get to it. Was wondering if I can just put some jb weld on the head of a screw and on the plug and stick 'em together and pull. Bad idea?

Title: Re: air/fuel mixture screw approach
Post by NWAPhoenix on 08/11/08 at 11:28:13

I drilled mine out. Started with a small bit and worked up a size at a time. Only took about a minute maybe two. Just be careful and don't go too deep.

Title: Re: air/fuel mixture screw approach
Post by Josh C on 08/11/08 at 11:59:46

so that little screw tip won't give me any trouble? I was worried that with that in there giving my some extra length, trying not to go too deep would be impossible. By the way, how deep is too deep?

Also, don't have a drill - but I'm sure I could get ahold of one - hence my initial interest in the JB Weld

Title: Re: air/fuel mixture screw approach
Post by shadowman on 08/11/08 at 12:12:43

I just did mine and as I recall, if you have gone 1/8" you are in the danger zone. The brass plug is softer than steel, so you can take it real slow and back out every few seconds until you penetrate. You might also start with a very small pilot hole to guage the depth and then re-drill with something just smaller than your sheet metal screw. With luck, it's a 60 second job.

Title: Re: air/fuel mixture screw approach
Post by verslagen1 on 08/11/08 at 13:48:26

Some have boogered this up and screwed it up so bad as to not be able to adjust the screw ever again.

So while I know I could do it, ask yourself, man w/o a drill can you handle it?

If you can, get yourself a drill, an 1/8" drill stop.

With that broken off screw tip in there it complicates the issue. I'd drill that out 1st. Harbor Freight sells a really crappy 1 use only set of mini carbide drills. Go at it with the smallest you can handle and incrementally go up in size till that tip is removed. You might want a dremel to do it.

OK? tip removed? Chuck up an 1/8" drill, slip the 1/8" collar on and set the drill depth to 1/8". lightly drill to the depth of the stop. A little wd40 don't hurt. If the drill grabs, it might even spin out the plug for you.

Any who, don't be in a hurry, take a sip o'beer once in a while.

That tip broke off cause not enough of the body engaged to take the torque you were using.

Title: Re: air/fuel mixture screw approach
Post by Sandy Koocanusa on 08/11/08 at 19:57:16

Why wouldn't his idea work? I've never used JB weld, but if it'll stick to brass, you could glue a volkswagon bumper to that plug and then just drive away, pulling it right out. That might be a lot safer than drilling and screwing anyway.

Title: Re: air/fuel mixture screw approach
Post by LANCER on 08/12/08 at 05:06:35

If just the "tip" of the pilot air adjusting screw has broken off and is still down inside the carb body and are trying to get it out ... DO NOT DRILL .
Use air pressure, or water power jet, pressure washer; anything but a drill to get the tiny piece out.

If you drill there is always the chance that the carb will be damaged and if so then you can just chunk it into the trash can, because there is no repair for that kind of damage.

Title: Re: air/fuel mixture screw approach
Post by Sandy Koocanusa on 08/12/08 at 05:14:21

Unless I'm mistaken, Josh is talking about using a new screw, turning it around, and gluing the head to the plug. Then he will have a handle for pulling. I say try it once, Josh. The worst that can happen, as I see it, is that you pull and the screw pops off.

Just be sure not to get any JB Weld on the carb body. You don't want to glue the plug in.

Title: Re: air/fuel mixture screw approach
Post by bill67 on 08/12/08 at 05:17:41

Jb gets real strong I think it will work.

Title: Re: air/fuel mixture screw approach
Post by LANCER on 08/12/08 at 06:02:04

I stand corrected; I did not read the first statement fully and jump off the wrong end of the board.

Title: Re: air/fuel mixture screw approach
Post by NWAPhoenix on 08/12/08 at 11:11:55

2528272A2C3B7B7E490 wrote:

The way I read it I thought he had used a sheet metal screw in the plug in an attempt to pull it out and that was what broke. As a tip, when I drilled mine I went very slowly and as each larger bit grabbed it actually twisted the plug out. Go slow and only let the drill make a few turns on each size bit.

Title: Re: air/fuel mixture screw approach
Post by Mr. Hyde on 08/13/08 at 05:46:49

General information: The orfice/hole that the brass plug fits in is, on my 07, 1/4 inch deep from the rim to the top of the mixture screw. The brass plug is 1/8" thick. That gives you 1/8 of an inch to play with. Going slow, mine came out with little effort.

Title: Re: air/fuel mixture screw approach
Post by Charon on 08/13/08 at 06:13:48

On the Savage/S40, it is easy. There is almost unobstructed access to the screw cover plug. On my Kawasaki 250 Ninja the carburetors have to be removed to even get access. Of course, if I had one of those handy little drills dentists use, I could have done it easily.

Title: Re: air/fuel mixture screw approach
Post by justin_o_guy2 on 08/13/08 at 10:49:57

Clean the brass up, so the JB weld will stick, same with bolt head. IF the edge looks like it will force JBweld onto the cast aluminum, put a little oil on what isnt to be glued, just dont let it run to where you need the metal clean. I mean, clean, like sandpaper, files, clean, Not just soap & water clean. A dremel to cut the broken screw down flush would be good.