Jet help needed please

Post by **cheshire190e** » 20 Oct 2008 02:27 pm

Hi everyone, am i right in thinking the 2 on the left are the emulsion tubes, air jets and the one on the right is the idle air jet?

if so where are the main jets :s

Thanks.

Matt

Post by **jtbo** » 20 Oct 2008 04:23 pm

Hmm, you have some extra holes in those?

First two are emulsion tubes, Can't say for sure what last one is, even I know where it is from.

I was under impression that air would always pass trough barrel and there would be no need for air jet, but I don't believe that even myself anymore, carbs are just too complicated for me.

Fuel jets are at bottom of holes where you took those emulsion tubes out from, I needed to tune one of my screwdrivers to fit there. Fuel jets have numbers at their side and it is something like 115 which means hole is diameter of 1,15mm if I recall correctly.

Post by **cheshire190e** » 20 Oct 2008 04:40 pm

i thought the fuel jets were below the emulsion tubes but i looked down the hole and could not see anything to unscrew.

i tried probing with a small screwdriver but there was nothing to unscrew.

im confused haha

Thanks for the info

Matt

Post by **Chris_C** » 20 Oct 2008 05:01 pm

Jani's right, there should be some more bits under those bits

I also think Jani is right in that both tubes should only have 5 holes, I'd check but it's pouring outside.

EDIT: Ok, thats less than helpful... More bits under those *long* bits

Post by **jtbo** » 20 Oct 2008 05:13 pm

cheshire190e wrote:i thought the fuel jets were below the emulsion tubes but i looked down the hole and could not see anything to unscrew.

i tried probing with a small screwdriver but there was nothing to unscrew.

im confused haha

Thanks for the info

Matt

You are right, you can't see them, but trust me, they are there

It seems that my photos from cisac carb are not helpful here as I don't have pics of jets and I'm over 400km from home again, so this pic have to do:

140&145 are main fuel jets, screwdriver that you will need have to have tip as wide as is that hole where you took emulsion tube out, tip have to be quite narrow, like edge of knife, almost, in fuel jet there is only small places at edges where your screwdriver fits, so that is reason why I needed to tune one of my screwdrivers, tip and base of screwdriver 'blade' have to be straight and even in diameter, best to find screwdriver that has tip around as large as hole, then use angle grinder or something else to cut material out from screwdriver so that you will end up with screwdriver that has maximum width same or less than tip of that screwdriver.

Hope this helps

Oh yes, one tube should have 4 holes, another should have 2, if it is from B200K Cisac.

Few pages of cisac photos:
http://www.janiervast.com/gallery2/thum ... m=8&page=8

Post by **cheshire190e** » 20 Oct 2008 05:28 pm

cheers Jani,

Im just going to have to keep trying. now i know for sure there down there

Thanks

Post by **jtbo** » 20 Oct 2008 05:35 pm

One correction, I said that one emulsion tube should have only 2 holes, but 3 is correct figure, it has one at bottom and one quite top of it, I believe this one belongs to 1st barrel and one with 4 should be in 2nd barrel, but Haynes or Green books should tell how to put it, 1st barrel being one where throttle butterfly opens immediately.

Main fuel jet of 1st barrel was bigger number than in 2nd barrel if I remember correctly, differences are noticeable, but at least in my case those did not made that big difference if they were wrong way.

edit: Oh yes, for 1.7 emulsion tubes and jets are different size, can't remember how, but I remember I laughed when I last time did compare those