Removing the "brass tube" - Dellorto SHA

I just successfully removed, repaired, and reinstalled the "brass tube", and thought I'd share the technique.

As it turns out, the hole in the end of the tube is just about right for a 2/56 tap. Do that (about 1/2" deep), then screw in a 1" cap screw with a nut and a washer already on it. (Or a bigger nut if you can't find the right washer, as in my case...). Then run the nut down, which will pull the tube right out:

DSCF4109.JPG
DSCF4111.JPG

Once you're done doing whatever you wanted to do to the tube, put the screw back in and push on that to get it back in place.

In my case, someone had drilled the idle jet out too big. I cleaned up the hole, filled it with solder, and drilled the correct size hole in the solder. Good as new (I hope!!).

Re: Removing the "brass tube" - Dellorto SHA

Bad Cadillac™ /

Sweet! Nice tip!

Re: Removing the "brass tube" - Dellorto SHA

Very ingenious! For those of us who have the time and tools. Thanks! don-ohio (:^)

Re: Removing the "brass tube" - Dellorto SHA

Thanks! And it worked - running much better now, but the &^%$#* float valve is now leaking :-(

Re: Removing the "brass tube" - Dellorto SHA

Correction - it was the banjo fitting. All is well now :-)

Re: Removing the "brass tube" - Dellorto SHA

Kevin Bishop /

for now....

Re: Removing the "brass tube" - Dellorto SHA

I tried this today, I was very skeptical, works like a charm....2/56 screw FTW!

Re: Removing the "brass tube" - Dellorto SHA

I have two more 12.10 to bore out. This should make it easier! Thanks!

Re: Removing the "brass tube" - Dellorto SHA

This is such a great idea I added it to the over-boring tutorial on the wiki. I had to do that because when I went to look for the thread, I had a hard time finding it!

Perhaps it even deserves its own spot. (edited)

Re: Removing the "brass tube" - Dellorto SHA

nice work Dave.

Re: Removing the "brass tube" - Dellorto SHA

So the 2/56 " tap and matching screw and bolts is a comman size? This is a much easier solution than on gram's blog. Congrats.

Re: Removing the "brass tube" - Dellorto SHA

Jimmy Cauchon /

did you drill for the idle after installation of the brass tube or before?

Any tricks for lining up that idle jet ?

Re: Removing the "brass tube" - Dellorto SHA

James Cauchon Wrote:

-------------------------------------------------------

> did you drill for the idle after installation of

> the brass tube or before?

> Any tricks for lining up that idle jet ?

I drilled the solder plug before putting it back in. The previous owner had drilled it out to 1/16", so it was pretty easy to get things to line up. There is a flat milled in the tube which you can look at to make sure you have it rotated correctly.

Re: Removing the "brass tube" - Dellorto SHA

2016-10-2720.02.47.jpg

So I found out you can't just go out to Home Depot (or Menards, or Ace Hardware, or Lowes, or Walmart) and get a 2-56 tap. You gotta go to Amazon or other online retailer. But once you get it, you'll never regret it. I did it once following the tutorial, and it wasn't hard at all. But I just did it this way, and it was even better. Super cool, Dave.

Re: Removing the "brass tube" - Dellorto SHA

That 12.7 needs a bore baddddd

Amazon link please

Re: Removing the "brass tube" - Dellorto SHA

https://www.amazon.com/dp/B0006O4GYG/

Re: Removing the "brass tube" - Dellorto SHA

Grande Guru Wrote:

-------------------------------------------------------

> That 12.7 needs a bore baddddd

>

For sure. I got it off a Bravo from Iowa. Swapped in a 12.10 from another Bravo that needs fixed; instant upgrade!! I'll drill it out and swap it back in.

Re: Removing the "brass tube" - Dellorto SHA

2/56 tap is hard to find

Re: Removing the "brass tube" - Dellorto SHA

Ninja . Wrote:

-------------------------------------------------------

> 2/56 tap is hard to find

Right??? I had to go online.

Re: Removing the "brass tube" - Dellorto SHA

Very Creative

Re: Removing the "brass tube" - Dellorto SHA

do you need a pilot hole? or does it tap right in? i just got the tap only from ebay. what size bit was that in the amazon link?

i have 2 vespas to bore! :-)

Re: Removing the "brass tube" - Dellorto SHA

On mine, it went right in without drilling. No guarantee though :-). Chart calls for a #50 drill for a 2/56 tap.

Re: Removing the "brass tube" - Dellorto SHA

Same for me. Went right in.

Re: Removing the "brass tube" - Dellorto SHA

Where do ya get the screw. Is that a comman size what pitch thread. I ordered the tap.

Re: Removing the "brass tube" - Dellorto SHA

Marc Friedman Wrote:

-------------------------------------------------------

> Where do ya get the screw. Is that a comman size

> what pitch thread. I ordered the tap.

The screws are 2-56 (that's what it'll say on the package). I was able to find those at a local hardware store. Make sure you get one that's long enough. I found the screws before I found the tap, so I didn't buy them. Then, when I had the tap, I used a screw I found in my scraps which happened to be the right thread. But, it's barely long enough. I'd say go for 1 1/2 inch if you can get it.

Re: Removing the "brass tube" - Dellorto SHA

why is it so hard to find a 2-56 x 1.5" bolt? i cannot find it on ebay. weak...

Re: Removing the "brass tube" - Dellorto SHA

It's hard because this is mopeds.

Re: Removing the "brass tube" - Dellorto SHA

Microfasteners

Re: Removing the "brass tube" - Dellorto SHA

Here's one maybe you can use.

Here's another option.

(edited)

Re: Removing the "brass tube" - Dellorto SHA

Hey, I hit the local hardware store today and picked up the longest 2-56 I could. Found out 2-56 x 3/4 is easier to find. It also looks plenty long enough to do the job.

IMAG2544.jpg

(edited)

Want to post in this forum? We'd love to have you join the discussion, but first:

Login or Create Account