Topic: Working on carbs on 78F

[6adan]

I need to clean the carbs and need to know how to remove the pressed in jets without destroying them.Can someone please tell me how to do this?

Thanks Dannie

[harisuluv]

You can use some vice grips with flat jaws that won't bite into the metal.  Add some tape to the jaws so you don't ding up the surface of the jet.  Clamp down on it and be gentle.  Best to twist it right and left while gently pulling out.  Just pulling out doesn't work so well and you can bend the jet too.  Hope that helps.

[xnoahx]

I grabbed mine with a set of pliers and twisted while pulling.  Didnt worry about the outside getting a little scratched because that doesnt effect performance.

[TwoTired]

imo, best jet puller shown below.

I never twist during the pull, as I do not want the hole to get bigger or the jet to get smaller for the interference fit.  Minimizing the friction keeps the metal where I want it, rather than rubbing it off.

Note, twist drills are used to remove metal, and they do so even when dull.

Cheers,

[6adan]

  TwoTired if you sent a picture I did not get it and I am not sure exactly what you are talking about when you say twist drills. I would like to know more about them.

Thanks Dannie

[TwoTired]

Hmm.  Maybe I forgot to add the pic.  Anyway, it's there now.

Regarding twisting:
When you rub two materials together, each loses a bit of itself in the process.  Twisting the brass jet in the aluminum zinc alloy carb body, removes more metal from each than simply pulling the jet directly out of its held position in the body.  If this is done enough times, the holder gets too big, and the brass jet gets to small for a positive friction fit.  The result is that they fall out during run time (approximately 50-100 miles from home).

The wear that occurs from the twisting is cumulative, and may not be severe enough with just one removal and replacement cycle.  However, over repeated cycles it can be.  If you don't care about the 5th-20th jet cleaning cycle, then twist away.  All I'm saying it that is is hard to put the metal back on, once it is worn off.  So, I take measures to minimize the removal by not twisting the jet in its carb body holder during removal.

Cheers,

[6adan]

TwoTired thank you for the reply, I understand what you were talking about now.

Dannie

[anders288]

imo, best jet puller shown below.

I never twist during the pull, as I do not want the hole to get bigger or the jet to get smaller for the interference fit.  Minimizing the friction keeps the metal where I want it, rather than rubbing it off.

Note, twist drills are used to remove metal, and they do so even when dull.

Cheers,

    1+

[6adan]

Just wanted to thank everyone for the help. I did not have a set of pliers like TwoTired but I did have some sheet metal pliers with copper in the jaws and they worked great,no twisting. Bike running good now.

Dannie