Micro size drill bit sets

[KMB]

Does anybody know where I can get a set of drill bits for diameter sizes of 0.50mm and up, and the price? I'm pricing things out to decide if I'll drill out my fixed jet in my carb(after my muffler mod for my MS 260) or get an adjustable WT-426 carb instead.

 

[HiOctane]

Check auto parts or hardware store.

 

[Lawn Masters]

Since I'm not real good at the micro drilling stuff, Id say just get the fully adjustable carb. personally, and this is just me, but I like fully adjustable carbs, none of that fixed jet stuff for me. again, thats just my opinion.

besides, the fully adjustable I think you can probably get the tuning done easier with it than the fixed jet, and set it EXACTLY where you want it to be.

 

[ShoerFast]

KMB
You can also use welding tip cleaners, inexpensive and they work very well, the only draw back is that there harder to do the same thing twice with,,,,, but you looking at one saw at a time here, they would get the job done for you.
Just a trick, sneek up on the size you need,,,, it dosant take a not of time to put the carb back on and try a new jet size.

 

[Bob Wright]

Try http://www.mcmaster.com Bob

 

[Butch(OH)]

I'm not a milimeter person (still on King Louie's yards feet and inches) but I think you need a number drill set. The smallest ones are so small I about need a magnifier to get them back in the index. I just bought a China made TcN coated number, letter, fractional set up to 1/2" from Harbor Freight for $39. Ok for junk work and for your carb jets. If your into nice tools or want to use them heavily I suggest the Cleveland Twist Drill set but be prepared for many times $39. We have a local H-F store but Im sure you can order online.

 

[Butch(OH)]

man you guys are quick, was no responces when I started typing that.

 

[davefr]

You want a #74 drill bit. It's .572mm. (ie .012 larger then the stock .56mm jet)

Try Ace Hardware. They'll sell sets and might even have the individual drills.

 

[skwerl]

The different size jets are only $5 each, although you will have to order them from your dealer as few will stock this item. Due to frustration levels with trying to tune a carb without being able to simply adjust the jet screw, my recommendation is to just buy the adjustable carb. I was in the same boat 3 years ago and figured "it's only $5 for the jet" and I had countless hours and 3-4 jets invested in that POS before I finally wised up and bought an adjustable carb for it.

But by that time the piston was scored from running lean so I ended up getting rid of the saw and bought a Husky 346XP. Since then I've bought 3 more Huskies. Screw Stihl and their fixed jet carbs.

 

[KMB]

Since I'm not real good at the micro drilling stuff, Id say just get the fully adjustable carb. personally, and this is just me, but I like fully adjustable carbs, none of that fixed jet stuff for me. again, thats just my opinion.

besides, the fully adjustable I think you can probably get the tuning done easier with it than the fixed jet, and set it EXACTLY where you want it to be.

I keep leaning towards the 'adjustable carb' side of the fence, and I think you've helped the cause. Thank ya.

 

[KMB]

The different size jets are only $5 each, although you will have to order them from your dealer as few will stock this item. Due to frustration levels with trying to tune a carb without being able to simply adjust the jet screw, my recommendation is to just buy the adjustable carb. I was in the same boat 3 years ago and figured "it's only $5 for the jet" and I had countless hours and 3-4 jets invested in that POS before I finally wised up and bought an adjustable carb for it.

But by that time the piston was scored from running lean so I ended up getting rid of the saw and bought a Husky 346XP. Since then I've bought 3 more Huskies. Screw Stihl and their fixed jet carbs.

Another push to the 'adjustable carb' side of the fence...thank ya. I love my Stihl and I'll keep it and most likely get the adjustable carb. I have no problems with Husky saws, I got my Stihl for a good deal and have decided to stick with it. Eventuallly I'll be getting a second bigger saw and if I came across a GREAT deal on a 357XP or 372XP (compared to a 036Pro/360Pro or 044/440), who knows...but it would have to be a deal I'd be crazy to refuse.

 

[KMB]

Hunting season is still on around here so it'll be at least a month before I set my rifle and bow aside for a while to cut some more wood. So I think I can wait and find an adjustable carb for my saw. I was thinking on doing the 'drill-out-the-fixed-jet' thing cause I wanted to do something quick and cheap - which I might be able to do if I could get individual drill bits easy and cheap. But I'm picky and I think I'll like the EXACT adjustability.
I didn't think the local hardware stores would have speciality drill bits of that size, but from the replies I've got, I'm wrong. For curiosity I will be checking out the local hardware stores. Thanks to all for the info and suggestions. I'm learning something new every day. Any more knowledge, have at it!

 

[Lakeside53]

Hunting season is still on around here so it'll be at least a month before I set my rifle and bow aside for a while to cut some more wood. So I think I can wait and find an adjustable carb for my saw. I was thinking on doing the 'drill-out-the-fixed-jet' thing cause I wanted to do something quick and cheap - which I might be able to do if I could get individual drill bits easy and cheap. But I'm picky and I think I'll like the EXACT adjustability.
I didn't think the local hardware stores would have speciality drill bits of that size, but from the replies I've got, I'm wrong. For curiosity I will be checking out the local hardware stores. Thanks to all for the info and suggestions. I'm learning something new every day. Any more knowledge, have at it!

It's been said by the others - get an adjustable carb. To drill out the jet's is tricker then it looks...

Sounds like you've decided to change the carb, so this information is more for other contemplating modifying the exiting carbs.

The BEST way to enlarge (with precision) is to get a set of weber carburetor REAMERS.. The reamers are much more precise, and usable than fine drills which really need high RPM to drill correctly.

Replacement of the main jet is easy and they are available in .01mm increments, but you'll spend a ton of time changing jets, disassembling and refitting carbs and deciding it it really is the "right" choice.

 

[davefr]

It's been said by the others - get an adjustable carb. To drill out the jet's is tricker then it looks...

Sounds like you've decided to change the carb, so this information is more for other contemplating modifying the exiting carbs.

The BEST way to enlarge (with precision) is to get a set of weber carburetor REAMERS.. The reamers are much more precise, and usable than fine drills which really need high RPM to drill correctly.

Replacement of the main jet is easy and they are available in .01mm increments, but you'll spend a ton of time changing jets, disassembling and refitting carbs and deciding it it really is the "right" choice.

If a person is spending tons of time changing jets then the saw or carb likely has other major problems that the owner hasn't addressed.

Stihltech has said repeatedly that a .01mm increase is all he's ever had to do to richen up an 026.

If the saw ran good with the stock muffler, and if the only change is opening up muffler flow, then a .01mm increase should be all that's ever required if it needs a slight richening step up.

Now if your saw is used in vastly different environments. (ambient temp and elevation) then I'd probably plunk down the $80 or whatever a WT-426 costs.

 

[Patrick62]

I have done that

I can't think of where to buy them, but there is a little index ( $30 ??) that has all the little bits down to #80 (really little).

I agree that I would have a adjustable carb on a saw, but you can jet one this way.
I have only done things like briggs engines, and couple of mopeds.

The only chuck that can hold the bits is a Dremmel. Better off holding the bit with pliers and spinning the jet with a drill. Don't run them too fast. Almost impossible to re-sharpen.

-Pat

 

[davefr]

I can't think of where to buy them, but there is a little index ( $30 ??) that has all the little bits down to #80 (really little).

I agree that I would have a adjustable carb on a saw, but you can jet one this way.
I have only done things like briggs engines, and couple of mopeds.

The only chuck that can hold the bits is a Dremmel. Better off holding the bit with pliers and spinning the jet with a drill. Don't run them too fast. Almost impossible to re-sharpen.

-Pat

Forget the drill. We're only talking a .01mm increase and the orifice in the jet is hour glass shaped so that only the very center need to be enlarged.

Hold the drill bit in pliers or small vise grips and give the jet a couple twists between thumb and forefinger. That's it!!

 

[046]

I've jetted hundreds of weber carbs. increments are small. I use a set of weber reaming tools. then carefully measure with a set of weber pin guages.

those tools are kinda hard to find, so what I recommend is a set of cheap chinese small index drill set for aprox. $4 at wholesale tools. then use a pin vise to drill by hand only