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Discussion Starter · #1 ·
Larry's carb book recommends a couple of tiny drill bits that are numbered drill bits.





Xacto sells a 20 piece tiny drill bit set that goes for $33.99 +shipping that has the sizes one would need. It is decent carbon steel and has a small footprint case with the drill bits.



Squadron Tools (squadron a huge plastic model kit seller) Has a 20 piece set of numbered drills from 61-80 for $11.29



Zona (owned by same company that makes Foredom which is big in powered shaft rotary carving equipment) sells their 20 pc numbered drills for $24.39



squadron bits



Xacto bits



zona bits



Had I known the Squadron were available so cheaply I would have ordered them from Tower.



Probably all made in China.



Here's a link to look up the numbered drill bit sizes in decimal or metric. numbered size Xref



The 0.018 drill bit is a #77

The 0.031 drill bit is a #68

I don't have my book handy to see if there are other bits needed...



Hope this is helpful.
 

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Most Hobby Shops will have the bits and sell them individually. If you buy those sets, you will be paying for a lot of bits you will not likely ever use. I wrote down the numbers for the ones Larry recommended, and bought a spare of each. I think they sell for 1.99 each at most shops, some are sold in 4 packs in case you break them.



I also picked up what is called a pin-vise to hold the bits. It is an aluminum collet arrangement basically with a wooden ball type handle--worked great. Larry showed a Hemastat, this works too, but I liked the pin vise much better.
 

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One thing these tip cleaners can do that the drill bits can't is that you can bend the last 5mm of the appropriate sized tip cleaner at a 90 degree angle to get those 3 little holes in the bottom of the main body under the throttle butterflies.



I'm not biased, I use both.




I've also been using interdental brushes which are like tiny bottle brushes.
 

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I've been using the snipped off ends of my Guitar strings for years.Never a problem


I know you like the strings...do you fish the guitar strings through the carb body ports to clean them? I did not do this on my last rebuild but might on the next go around. The jets and brass bits are one thing, but the actual carb body ports...thats another!
 

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I know you like the strings...do you fish the guitar strings through the carb body ports to clean them? I did not do this on my last rebuild but might on the next go around. The jets and brass bits are one thing, but the actual carb body ports...thats another!


I use then down the Brass venturi from the top and under the Black Banana and the E or B strings into the holes either side of the Throttle plates but also blast through with Carb/Brake cleaner during and afterwards just to make sure fluid flows through all of them.In other words no matter what I use I check with Carb/Brake cleaner that fluid can flow where it's supposed to and nothing is blocked




I NEVER use them in the primary and secondary main jets.I just boil them in a pan with a bit of washing soda crystals/washing up liquid and then high pressure blow out
 

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The 0.018 drill bit is a #77

The 0.031 drill bit is a #68

I don't have my book handy to see if there are other bits needed...
I haven't gotten my bits yet, but I did write them down to search eBay.



From Larry's description, we need the following sizes:

.085 = #44

.042 = #58

.040 = #60

.039 = #61

.031 = #68

.026 = #71

.024 = #73

.018 = #77



The welding tip cleaner for the holes under the throttle plate is .023.



Thanks for the links.





R
 

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Discussion Starter · #14 ·
Squadron has a website and sells it for a bit more, so even though the shipping is less at Squadron it is a little more expensive for me than Tower Hobbies.

But that might not be true for everyone.

Here's Squadron's website link to the drill bits for $13.48 Squadron drill bit set
 
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