38mm gsxr 750 carbs .brass jet unknown location??? help

[B2BC]

stripped down my carbs 

found a brass jet in carb 2 just sitting in the bowl

no size on it no thread either cant seem to find where it from looks like it will just sit inside

not even sure if its from these carbs

[kokolis]

Compare the rest then, you have four

[Captain Chaos]

could be from the choke circuit, in the plastic float holder thing. They tend to fall out. Compare with another carb as Koko said.

[B2BC]

ive looked over the other carbs and cant see anything similar in any of them

[gixanator]

isn't that a float bowl sealing wotsit?

when the float rises the rubber bit jams in the fuel feed spigot stopping any more fuel.

or not.

[B2BC]

the others dont have this piece ive fully checked them over all jets removed ect no sign of any others having this

cant seem to find a part schematics for these carbs either on the net

[gixanator]

item 18.

it might not be your exact carb but that's the bit you're looking at.

http://www.thumpertalk.com/topic/1060493-mikuni-bsr-float-valve-trouble/

[gixanator]

it's the float bowl valve.

[gixanator]

or not

[gixanator]

item 37 on this pic

http://www.mikuni36.com/brs36 schematic.html

[gixanator]

item 39 in this pic

http://www.bikebandit.com/oem-parts/1988-suzuki-katana-1100-gsx1100f-carburetor/o/m147913sch245349

[gixanator]

item 42 in this pic

http://www.subirimagenes.com/privadas-bst31ss-2037145.html

[gixanator]

or not

[kokolis]

So many possibilitys lol

[gixanator]

if you're talking about the tiny brass bit is it this?

second pic in the thread.

http://www.say what now!?.com/forums/showthread.php?t=159718&page=2

[B2BC]

all my float bowls have the brass screw in jet at the bottom same as that picture on the link you put up.

its not the float valve pin pictured its the brass pin next to it i took a photo like that for size comparison 

it was just sitting in bottom of float bowl 2 and ive stripped these down and theres now where it would fit i think its fell in there on a previous overhaul from last owner.

[gixanator]

any joy from my last post B2?

[Captain Chaos]

look in the plastic float assembly. There should be some brass bit in there, it's from the choke circuit.

[gixanator]

from what i can glean from the interweb, the "jet" they show in pic 2 is a press fit rather than a screw fit but can't be absolutely sure.

Your assumption it's a left over from a previous rebuild seems a good shout.

Sure someone who's worked on these will be able to sort it for you.

[gixanator]

this might help B2

http://www.mtsac.edu/~cliff/storage/gs/Mikuni_BS-CV_Carburetor_Rebuild_Tutorial.pdf

[Captain Chaos]

please note my awesome photo editing skillz

[gixanator]

page 50 shows a spray procedure that looks like that little jet in a brass tube, is that it?

[B2BC]

i think cc has it spot on just checked and the brass jet fits into same as pictured only problem is all the others are missing and only have 1

shouldnt be a problem should it if all are missing ?

[B2BC]

just found a set of old 600 gsxf carbs and they have exact same brass jet in float same size shape and hole size so ill replace all missing ones with these 

thanks for help lads

[Captain Chaos]

a mate had a Triumph Trophy with 36mm Mikuni carbs which was a bitch to start cold on the choke. Investigation revealed that 3 of the 4 brass jets had come out of the plastic bits.

I installed them securely and everything was fine again (as far as everything can be fine with a Trophy).