Confused About Jets

[ms51ves3]

Taken a couple of jets out of my carb today as I need to up-jet for my exhaust on the RX-S.

In my Haynes manual it says the main jet is a 120 and I have a jet that says 120 on it but I also have what seems to be a jet (might not be) that says 612.0 on it.

What is this? Pictures are attached

To view them in full size, right click and view image

for replies.

https://i15.photobucket.com/albums/a376/ms51ves3/DSCF0012-1.jpg

https://i15.photobucket.com/albums/a376/ms51ves3/DSCF0015-1.jpg

https://i15.photobucket.com/albums/a376/ms51ves3/DSCF0017-1.jpg

https://i15.photobucket.com/albums/a376/ms51ves3/DSCF0019-1.jpg

EDIT: Am I right in thinking that what I think is a 6 and 1 is actually a little symbol of who produced the jet?

I would still like to know what it's for and why it seems so big though.

[MaybeGuy]

the haynes manual is for using stock everything.

you dont have a stock exhaust.

meaning you probably need to go up a size of jet.
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!!
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

[ms51ves3]

[Blau Zedong]

You daft Jew! The big "jet" is the seat the float needle sits in and doesn't need changing. The other one is indeed your main jet.
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18:54:48 Rob Fzs: jews don't give away stuff for free

18:54:59 Rob Fzs: unless its their clothes/ hair/ golden teeth

[MaybeGuy]

this might help
https://www.siue.edu/~rsutton/SR/carbbot1.jpg

if you have the same jets as stated in the haynes manual, then definatly upjet it, as it could be running lean which can work out pretty badly on a 2 stroke.

not a clue what size to use, so someone else can step in with that one.
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!!
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

[ms51ves3]

[MaybeGuy]

[Kickstart]

[ms51ves3]

[Pete.]

The 'needle jet pipe' in your drawing is called the emulsion tube. Not all carbs have the emulsion tube holding the main jet, but that one does by the looks of it.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[ms51ves3]

Borrowed a box of Mikuni carb jets from work today. The smallest one that was above a 120 was a 140. I fitted this but now it 4 strokes at 7,000rpm. Going to have to buy a 130 now

Had a complete panic moment though. When I took the carb apart I didn't use the manual because I'm stupid and thought it can't be that hard. I did not realise there was a float needle valve. Looked at my Haynes manual to rebuild it and it said Do not lose the float needle valve!.

I just went into a complete 'You fucking idiot' mode (sort of like crying without tears ). After a bit of running around I went back to my carb to just look at the thing I had ruined. I look underneath the carb and spotted a small metal needle stuck under the gearbox breather pipe. I ran to my dad shouting 'I've found the needle' Panic over

I won't do that ever again.

[Pete.]

[ms51ves3]