Hi Guys,

Another day, another question (or two).

I'm rebuilding my carbs for my new engine. Putting in some Sweet Sweet HRC jets and needles.

However, I find that my two sets of carbs have different size slow jets.

Picture below. Which one is the correct one?

if the picture isn't big enough, let me know and I'll upload a bigger one



Part two of my question...

Seems one of my expansion chambers got a bit munged in my stack. Only just realised how bad when I took the pipes off to drop the old engine out.

Picture below...



As you can see I tried heating then rapidly cooling a couple of the smaller dents. I only have a butane blowtorch so they didn't quite get red hot. Regardless, it didn't work.

I'm seeing the options online as:

1. 80% fill with water - freeze
2. Seal pipes and fill with compressed air, then heat the dents until they pop
3. Drill holes and physically pull or bash the dents out - weld up holes.

Opinions on the best course of action?

Edit: I'll sneak a 3rd question in quickly.....

When setting the needle for the HRC jets is the top or bottom slot number 1? (Which end do you count from?)


Thanks (again)

Clancy

What are the part numbers of your two sets of carbs? They should have a number stamped on, like TA22. The reason for the different jets may be because they are different models of carb.

I have heard of (and read about) heating the expansion chambers after filling them with compressed air, but it's really really dangerous. So unless you feel REALLY confidant with getting just enough air pressure and just enough heat, I wouldn't go down that route! Take it to a reputable exhaust shop would be the best answer for me anyway. Good luck!

They're both TA22B carbs.

Seen vids on youtube with the compressed air method. Seems it's only about 30 PSI so not exactly huge.

think the longer slow jets run slightly richer. sure if i'm wrong some one will correct me! lol
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it wouldn't be fun if it was easy!

Are they both mc21 slow jets?

<General Jet Question - Hope it's ok???>

If the long ones are 38s but run rich and the short ones are 42s, which is going to be richer and which is going to be leaner?


Last edited by Skyntara on Wed Nov 17, 2010 9:25 am; edited 1 time in total

you plug off your pipe , pump in your air , heat the area of dent gently and most of the dent will push out . The stainless is very thin

The short #42 is HRC, and unless you're running pre-mix, highly likely far too rich.

A long #38 will be richer than a short #38, but not richer than a #40 or #42.
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Andy.
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pvan340 wrote:I have heard of (and read about) heating the expansion chambers after filling them with compressed air, but it's really really dangerous. So unless you feel REALLY confidant with getting just enough air pressure and just enough heat, I wouldn't go down that route! Take it to a reputable exhaust shop would be the best answer for me anyway. Good luck!

Can you explain why you think its dangerous?

Because if you get it wrong it will blow your head clean off your shoulders?
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If I have to take the carbs off once more...

Skyntara wrote:
Seen vids on youtube with the compressed air method. Seems it's only about 30 PSI so not exactly huge.

And then you heat it up which makes it higher. . . .

good old pv/nrt

I used the "send the pipes to an expert and let them fix it method". Worked great and wasn't all that expensive.

Here are some before/after pics of the dent(s) I had removed. Much larger then what you have.
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Charles Gallant